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214 Cards in this Set
- Front
- Back
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What does the bus transfer system provide?
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2 sources of power to equipment that is vital to the ship.
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What precautions must be taken when testing bus transfer equipment?
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ensure any vital or sensitive loads fed from the ABT switch are isolated.
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Circuit breakers provide the power distribution system with what function?
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normal switching operation, circuit protectin, and circuit isolation.
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Which circuit breaker is used to protect single-load circuits and all feeder circuits coming from a load center distribution panel?
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AQB
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Which type of transformer recieves electrical energy at one voltage and delivers it at the same voltage (with no change)?
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Isolation
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For shipboard use for 450 volt, three phase, 60HZ ungrounded ships service power, the shore tie power cable must be ________.
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3 conductor, flexible, unshielded, 600 volt, type THOF-500 or THOF-400
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What would cause failure of the overcurrent device to trip the switchboard circuit breaker?
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Insufficient trip travel
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What is the function of a switchboard circuit breaker?
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circuit protection, circuit isolation, and the normal switching operation of an electrical circuit.
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What is the purpose of a yellow switchboard indicator light?
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abnormal, but not requiring immediate, attention
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Which meters are usually the only instruments provided for DC distribution systems?
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Voltmeters and ammeters
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What type of transformer isolates instruments from line potential, and produce in the secondary a difinite fraction of the primary current, thereby making it possible to measure large currents with a 5 ampere ammeter?
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Current Transformer
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Voltmeter and potenial coils of wattmeters are connected?
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either across the voltage to be measured or to the secondary of the potential transformer
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What type of transformer is designed for a rated secondary voltage of 110 volts and for the primary voltages ranging from 230 to 6,600 volts?
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Potential Transformer
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A rheostat is defined as a _____.
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resistor whose value can be changed
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Resistive wire wrapped around a cylindrical core, with a wiper moving over the surface of the wound wire core to vary the resistance within the circuit, describes a ____.
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rheostat
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What component is defined as a three-terminal variable resistor where the center connection is manipulable?
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Potentiometer
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What must be done to repair a potentiometer and rheostat that have erratic control?
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Use a non-lubricating electrical contact cleaner.
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What is the function of the reverse power relay?
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Circuit protection for the prime mover.
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What type of adjustments can be made to the reverse power relay?
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Both a time delay and a set point adjustment
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The function of the speed control circuit is to control the speed of the _____.
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Prime mover
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The most common problem with governors originates in the ______.
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mechanical linkage
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What component accomplishes speed and phase matching of generators?
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Synchronizer
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One of the more common malfunctions of a sychronizer is no _____ control.
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Governor
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How does a voltage regulator effectively regulate the voltage output of an AC generator?
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By varying the strength of the electromagnetic field
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What component senses the output voltage of the generator, compares a sample of that voltage with a reference voltage, and supplies the field power necessary to maintain the predetermined ratio between the generator voltage and the reference?
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Voltage regulator
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One of the most common malfunctions of a voltage regulator is ____.
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overvoltage
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An electrical motor that turns a generator to supply the closely regulated type III electrical power is known as a/an _______.
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motor generator set
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Equipment that changes an alternating current (AC) input to a direct current (DC) output is known as a _______.
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power converter
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The function of a static inverter is to convert DC voltage to ______.
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unfiltered three-phase AC voltage
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The functin of the uninterruptible power supply is to _______.
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prevent interruption of the AC power and improve the quality of AC power.
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Motor insulation temperature of 10 degrees C or higher than the manufacturers recommendation will shorten the insulation life by ____.
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1/2
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Why do you check windings temperatures on motors and generators?
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to compare insulation resistance measurements
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What chart must be used to correct insulation resistance measurments to 25 degrees C ?
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Insulation resistance-temperature nomograph
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What are the procedures for checking winding temperatures?
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Thermometer method or resistance method
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The purpose of the polarization index test is to determine the condition of the _______.
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generator windings
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What is the purpose of checking the air gaps of motors and generators?
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to monitor the equipment for abnormal conditions
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What is the name of the tool used to measure the air gap on motors and generators?
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a machinists tapered feeler guage
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Which actions describe the adjustment of the air gaps on motors or generators?
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realigning the armature, varying the number of shims beneath the poles or under the frame feet, or adjusting the bearing
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checking phase balance and rotation on motors or generators prevents _____ from occuring.
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decreased efficiency
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What indication would you see if a motor or generator was out of phase?
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decrease in the efficiency of a three phase motor.
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What are the only two acceptable methods for installing bearings?
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Arbor press method and heat method
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the brush holders distance from the commutator should be not more than __ of an inch, nor less than __ of an inch.
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1/8, 1/16
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If brushes are staggered, follow the correct method to prevent ______.
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curving of the commutator
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The preferred method of seating brushes to the collector is _________.
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wrap 80 grit sandpaper around collector and manually rotate rotor in direction of rotation 5-6 times.
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Why must two machines be aligned?
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to prevent premature machinery failure
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The term thermal growth is defined as ________.
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the amount of change in relative shaft position that occurs when horizontally mounted machinery changes from room temperature to operating temperature.
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What tolerances are checked when aligning the pump and motor shaft?
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In service and caution tolerance
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If a soft foot condition has not improved after 2 correction attempts, a ____ condition exist.
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bent foot
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What are two approved alignment methods?
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The indicator reverse method and the hot method.
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What is the preferred method for checking pump shaft alignment?
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Indicator reverse method
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What is the maximum alignment condition that will not cause damage to machinery called?
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In Service tolerance
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If soft foot condition has not improved after ___ correctin attempts, a bent foot condition may exist.
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two
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Occurs on horizontally mounted machinery when dial indicator rotated from 12 o'clock position to 6 o'clock position.
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Indicator Sag
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The limit of acceptable shaft run out is _____ inch.
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0.002
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An approximate method of checking alignment?
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straight edge and thickness gauge method.
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If brushes have riveted connections or hammer clips, replace when worn to within __ of the metallic part.
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1/8
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brushes that have tamped connections, replace when worn to ____.
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1/2 of origanl length
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brushes that have spring-enclosed shunts, replace when worn to ____.
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40 percent
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When technical manuals are not available, a pressure of ______ of contact area is recommended for integral horsepower and integral kilowatt machines.
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2 to 2.5 psi
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What is the effect of improper phase balance on a three phase electric motor?
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Damage to the winding due to overheating
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If you are trying to determine the condition of motor generator windings rated 1 horsepower, 1 KW, or higher, what important tool should be used?
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Polarization Index test
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What reading should be taken to monitor a motor or generator for abnormal conditions such as bearing wear or rotor inconcentricity?
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Air gap readings
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If you are comparing resistance of a winding at the temperature to be determined with the resistance at a known temperture, what method of measuring insulation temperature are you using?
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Resistance method
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At what degree Fahrenheit is a normal hydrometer reading taken?
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80
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A normal electroylte reading is between __ and __ at 80 degrees F
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1.210 and 1.220
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To correct for temperature, add ___ for every 3 degrees above 80 or subtract ___ for every 3 degree below 80.
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0.001
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While charging, you must never let the temperature of the electroylte in any cell rise above ____F
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125
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What are the basic components of the steering system on a Coast Guard ship?
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Steering controls, hydraulic system, rudder feedback system, emergency system
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In the primary mode, the steering system operates in the _____ mode.
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follow-up, non follow-up
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What are the main and emergency power sources for the steering system?
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Hydraulic and electric
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What is the maximum allowable amount of degrees between any of the rudder angle indicators and the mechanical rudder angle indicator that is connected to the rudder gear?
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+/- 2
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What term is defined as the average speed that the steering system rotates the rudder under full power and full pump displacement?
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Rudder rate
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A variable-speed, electric motor-driven, oscillating arm wiper, with a totally enclosed drive unit is what kind of wiper system?
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Pendulum
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How many different types of control units does the straight line window wiper system have?
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five
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What window wiper system uses heat from the motor to prevent the formation of condensation?
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Rotary
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The component that senses the state of charge of the batteries is the ____ circuit.
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saturable reactor sensing
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The conponent that converts AC current to DC in a charging system is known as the ____.
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rectifier
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The component that converts hydraulic energy from teh HPU into mechanical energy via the rudder
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Actuator
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Links the steering machinery to the steering controls and its purpose is to detect and transmit the rudders movement and position
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The feedback circuit
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How many step repeaters may be powered from an internal power source?
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2
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Components that are part of the MK27 gyro system?
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Synchro signal amplifier and switching unit
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What component houses teh operating controls, follow-up servo amplifier, alarm circuitry, power supply, and latitude conrol circuitry?
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ECU
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The J3 test point allows troubleshooting of the ____.
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master compass
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The two step-by-step repeaters from the gyrocompass require ____ VDC.
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70
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The basic function of a gyroscope is to be _____.
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A tool assuming any position in space
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Rigidity in space and precession are the two properties that allow a gyroscope to become a _____.
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gyrocompass
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What term can be defined as the tendency of the gyro wheel spin axis to remain in a fixed direction in space if no force is applied to it?
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Rigidity
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What controls the direction of the spin axis?
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Precession
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By applying a weight to the bottom of the vertical ring, a ___ is created.
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north seeking gyroscope
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What letters are used to designate the anemometer wind speed indicating circuit?
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HE
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Power requirements for the Belfort model 135 Aerovane indicator?
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115 volts ac, 60hz
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The wind direction and speed components are located on the ______.
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ships main mast, port, and starboard yardarms
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What device in the Belfort 135 Aerovane indicator indicates wind speed?
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Voltmeter
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What component measures wind speed and direction and transmits the information to remotely located indicators?
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Belfort 135 Aerovane indicator
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How many synchro's are in the transmitter of a wind speed indicator system?
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one
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The proper corrective procedure for a faulty wind speed direction system is to ______.
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replace or return to the nearest dealer or manufacturer for repair
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When the magneto shaft is rotated at 1,800 rpm, the voltage output should be ____.
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9.20 +/- 00.05 volts
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the function of the capacitor on the wind speed magneto is to _____.
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prevent RX interference
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What must be done when 2 Belfort 135 Aerovan indicator units share a signal from one wind speed/direction transmitter?
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The 2,300-ohm resistor must be removed from both indicators or from both the indicator and the recorder
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The salinity indicating system is specifically designed to accurately measure the salinity of water in the ______.
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Ship's freshwater producing equipment
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An audible and visual alarm activates when distillate contains ___ grains or more of salt.
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0.25
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Electrical conductivity of a medium is determined by the amount of _____.
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free ions
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In a salinity cell system, the function of the thermistor is to act as a temperature sensitive ______.
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resistor
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What are the three major parts of the salinity indicating system?
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Meter circuit, alarm circuit, and dump system
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What is the measured voltage value across the salinity sensor's plate gap, as compared to the measured voltage value in the alarm setting control?
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Reference voltage
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What causes the dump valve to divert water overboard?
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High impurity levels
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What is the term used to describe the temperature coefficient, if the resistance of a device decreases when the temperature is increased?
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Logarithmic negative temperature coefficient
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What indicator lamps is not provided on the salinity cell indicator panel?
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Salinity cell replacement
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The basic operation of an alarm system consists of ________.
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Detecting an alarm condition in a particular compartment of the vessel, and detecting a trouble condition within an alarm circuit.
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The function of the alarm panel is to monitor _______.
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supervisory and alarm circuits
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What type of circuit is used with flooding alarm system to detect the presence of compartmental flooding?
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Float
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The purpose of VLA lighting systems is to provide a/an ________.
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enviroments for safe helicopter operations
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The voltage requirement for the homing beacon light is ___ volts AC.
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115/32
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Deck edge lighting consists of a minimum of _______?
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red omnidirectional lamps
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Deck edge lighting is connected to the ________.
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low votage side of a 115/12 volt step-down transformer
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When operated in the strobe mode, how many extended line-up lights flash?
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9-10
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Extended line-up lights are ___ in color.
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white
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Which VLA lighting system does the flasher sequencer control?
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Extended line-up
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The vertical drop line light bar is located ___ of the landing line-up lights.
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aft
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The helicopter in-flight refueling lights (HIFR) provide _____.
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the pilot a visual indication of the ships heading at all times and provide a height reference during in-flight refueling operations.
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Spacing of the HIFR lights is every ___ feet.
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20
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What are the power requirements for the VLA system?
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120 volts, 60hz
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How many motor-driven variable transformers are there in the VLA lighting system
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six
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The minimum ampere requirement to run the VLA lighting system is __.
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2
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The detector circuit of the motor-driven variable transformer recieves its input from ____.
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Remote control potentiometer
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The wave-off light system provides a visual indication to the pilot that the landing area is ____.
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ready
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What components of the wave-off light system does the terminal junction box assembly contain?
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The terminal connections to the WOL and the master control panel
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The function of the remote override switch is to ____.
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disable all remote stations from initiating a wave-off
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In relation to the glide slope indicator, where are the wave-off lights located?
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Each side
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What information do the four-lighted indicators on the wave-off sectin of the master control panel indicate?
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system on, deck control, wave off, and bridge indicator
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The preset flash rate for the wave-off light assembly is set at ___ flashes per minute.
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90
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How many wave-off lights are installed on a cutter?
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2
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What are the names of the 2 circuit cards in the master control panel?
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flasher driver card
monitor card |
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What purpose does the Wave-Off Light system serve?
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visual cue that landing condition are unacceptable
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The vertical drop bar line light is located ______.
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aft of the landing line-up lights
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The location and arrangement of HIFR heading lights is forward to aft on the ________.
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port side of the ship, spaced 20 feet apart.
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VERTREP lights are bidirectional fixtures that form a longitudinal line path at approximately ___ foot intervals?
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8-12
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What is the current capacity for the VLA system?
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10 and 22
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What is the circuit designation and classification for a Carbon Dioxide Release Alarm?
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FR
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What is the circuit designation and classification for an Air Flow Indicator and Alarm?
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HF
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What is the purpose that a typical alarm panel or switchboard system serves?
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Detect a trouble condition within an alarm circuit and detect an alarm condition i a particular compartment of the vessel.
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What are the basic components that work together to operate an alarm indicator system?
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Supervisory circuit, alarm circuit and alarm devices.
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How is a trouble condition indicated when troubleshooting an alarm indicating system?
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Yellow target
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What type of circuit is used with high temperature alarm systems to detect the presence of fires or overheated conditions in important compartments or spaces?
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Mercury thermostat
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To complete the supervisory circuit, a _________ must be connected across the switch contacts of each alarm circuit.
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7,000 ohm resistor
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Where do you apply weight to make a gyroscope north indicating?
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To the bottom of the vertical ring and a smaller weight to the east side of the rotor
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What method is used to make a gyroscope north seeking?
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apply a weight to the bottom of the vertical ring.
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The definition of precession is the tendency to the axis of rotation to turn _______.
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at a right angle to the direction of an applied force
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What components are parts of the Mark 27 gyro system?
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ECU, master compass, and power converter
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A synchro resembles a small electrical motor in size and appearance and operate like a ______.
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Variable transformer
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What principle is a synchro based upon?
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Electromagnetic induction
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What determines the type of synchro used in a system?
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The type of load imposed on the synchros
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What type of synchro is used to move and/or control heavy loads?
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Control synchro
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A _____ synchro is used to move and/or control light loads such as dials and indicators.
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torque
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Military standard and Navy prestandard synchros are designed to operate on either ___volts or ____ volts.
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115 VAC and 26 VDC
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What is the voltage rating predominately used for synchros on shipboard equipment?
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115 VAC
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The letter R and S, in conjuction with a Arabic number, are used to identify ___ and ___ connections.
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stator and rotor
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The rotor is usually the primary winding and recieves its voltage from an _____ source. The stator recieves its voltage from the rotor by magnetic coupling.
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external voltage
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What are the two types of common stator rotors used?
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Salient Pole and Drum or Wound rotor
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What is the most accurate way of zeroing out a synchro?
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AC voltmeter method
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The ______ method is perhaps the fastest method of zeroing sychros and is typically used on TR because the shaft is free to turn.
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Electrical lock method
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Rated frequency for a motor or generator can be located ______.
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on the machines nameplate data
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What information will be found on the calibration sticker for a hand held tachometer?
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calibration date, calibration due date
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One of the advantages of using milliamp signal as an output signal is that _____-
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a signal can be transmitted over much longer distance
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The first step in troubleshooting a transducer is to _____.
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verify that the transducer is the problem
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Compensation of the display readings on the transducer may not be made by _______.
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varying the zero and span
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What procedures must be performed before renewing a transducer?
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connect power and the pressure tester to the new transducer and perform the same checks as you did with the faulty transducer
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When replacing a transducer with a new transducer it must be _______.
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the same type and range or higher range
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The two types of elements for a resistance temperature detector are _________.
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nickel and platinum
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What are the three types of RTD configuration?
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Thermowell, Bare bulb, and Embedded
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One of the procedures for troubleshooting the RTD is to take a ________.
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resistance reading
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The function of a thermocouple is to measure _______.
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temperature
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Thermocouples will produce what type of electrical output?
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Millivolts
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As teh ambient air temp changes, the cold junction will begin to produce its own electrical potential. This would cause an erroneous reading of the actual thermocouple. What concept does this statement describe?
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Cold junction compensation
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The correct color coding for a type K thermocouple is ______.
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yellow and red
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The correct color coding for a type J thermocouple is ______.
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red and white
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The dissimilar metals used in type K thermocouple are _____.
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chromel and alumel
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The dissimilar metals used in a type J thermocouple are ____.
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constantan and iron
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A thermocouple is a key sensing component of an ______.
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pyrometer
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The three wire sensing element has ________.
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2 leads, colored white, that are connected to one end of the element
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What type of electronic circuit monitors the RTD?
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Wheatstone Bridge
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A three lead RTD does NOT require a ____ circuit.
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Compensation
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A bare bulb RTD is where the sensor ______.
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Must be directly immersed in a high pressure gas and response time is important
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When troubleshooting a circuit, you notice that the RTD is not malfunctioning. What would you replace the RTD with in order to test the monitoring system.
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Sensor Stimulator
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When would you calibrate the transducer: before you start repairs or after you finish replacing the part?
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after replacing the part
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Whay is the sensor calibration zero point actually 4 mA for the 4-20 mA sensor?
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to prevent a reading to be confused with an open
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Which component of the pressure transducer can convert gas/liquid energy into a physical (mechanical) displacement?
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pressure sensing element
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The reason a 4-20 mA signal is used because it can ________ with little to no interference
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be transmitted
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What type of hand-held tachometer is operated by placing its spindle tip on the center of the shaft of the rotating machine and pressing and releasing the start button?
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Chronometric
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Tachometer used to measure rpm in cases where the rotating shaft is not readily accessible?
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Resonant
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Part II of the (MICA) contains?
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Section B - APLs - Hull, Mechanical, and Electrical ( HM&E), and Section C - AELs Hull, Mechanical, and Electrical
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Supply information is broken down into a series of categories with each type of information displayed in a __________.
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Data Response screen
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Provides quick links to different screens in FEDLOG _______.
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Data View Tool Bar
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A Units OPFAC, a department code, a COG code, a stock number, a Unit of issue, a Quantity needed, a cost of each unit, a nomenclature and supplier are all required to fill out a ________.
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SURF requisition log
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Provides simplified acquisition and accounting functions for large unit of the Coast Guard.
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Financial and procurement desktop software
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Recommended changes to a PMS procedure must be in letter form and submitted to the ______.
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PMS coordinator
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COMDTINST 9077.1 (Series)
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tag out log
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Damaged or missing tags are replaced by _______.
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annotating in the danger/caution tag out log that it is missing. a new tag out shall be issued using the next sequential number.
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Audits should be performed on the tag-out log ______.
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bi-weekly
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All active tags listed in the tag-out log shall be checked as correctly installed by visual comparison of the information on the ________.
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tag out record sheet
tagout audit |
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Where can you find instructions to recommend changes to an MPC?
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in the front of the manual
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CMPlus uses ____ to update and track maintenance history information.
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Maintenance tasks
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What CMPlus option is used to produce maintenance reports?
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Maintenance History Option
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What are the 2 types of Maintenance in the Preventive Maintenance System?
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Corrective
Preventive |
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What are the 2 main functions of FPD?
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Aquisitions
Accounting |
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What are four required items for the SURF Requisition Log?
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OPFAC
Stock number COG code unit of issue |
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What are four required items for the Procurement Request?
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cost of shipping
price of the item Name, address, phone of supplier your name, phone, routing symbol |
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List three instances when a Initial Request may need to be updated or authorized.
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item not in store room
over spending limit item is for a repairable part |
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Part I, Section A, and Section D of (MICA)
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Equipment Nomenclature
listing of all APLs/AELs |
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To locate an item whenever CMplus shows a list on the screen, you can use _______.
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progressive typing
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NSN (national stock number)
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13 digit number assigned by the Defense Logistics Information System to an item of suppy
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NIIN (national item identification number)
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the last nine digits of the NSN
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Management Information for Configuration and Allowances ( MICA ) Manual
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contains detailed supply and technical information on every piece of equipment attached to a specific unit.
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The most commonly used index of MICA is
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Part I, Section A - Equipment Nomenclature Sequence
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