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50 Cards in this Set
- Front
- Back
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Low power factor in a motor will cause it to A. Have decreased current for its rated output B. Have increased current for its rated output C. Overheat excessively D. Operate below rated voltage |
B. Have increased current for its rated output |
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In the flow of one cycle of an AC current, the maximum current flow occurs how many times? A. Only once B. Four times C. Twice D. Thrice |
C. Twice |
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A resistance wire wrapped around an insulating core A. Film-type B. Fusible type C. Carbon composition D. Wire wound |
D.Wire wound |
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Askarel is a nonflammable, chemically stable, non-sludging synthetic liquid. Askarel is sold under which of the following trade names? A. Inerteen B. Pyranol C. Chlorextol D. All of these |
D.All of these |
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How is ac converted to dc? A. By means of a regulator B. By means of a clamping circuit C. By means of a rectifier D. All of these |
C.By means of a rectifier |
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An inductive circuit has a resistance of 100 ohms and an inductance of 2 henries. What is the impedance of the combination at w=377 radians per second? A. 754 ohms B. 761 ohms C. 682 ohms D. 500 ohms |
B. 761 ohms |
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In a parallel circuit, the total resistance is _____. A. The sum of all the resistances B. The reciprocal of all the resistances C. Larger that the largest resistance in the combination D. Smaller than the smallest resistance in the combination |
D.Smaller than the smallest resistance in the combination |
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At no load the terminal voltage of an alternator is 530 V. at rated load, the voltage drops to 480 V. Calculate the percentage voltage regulation of the machine. A. 10.42% B. 9.43% C. 90.56% D. 12.52% |
A. 10.42% |
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In order to achieve maximum power transfer, load resistance should be _____ generator’s resistance. A. Greater than B. Lower than C. Equal to D. Lower than or greater than but not equal to |
C.Equal to |
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_____ results in loss of electrical energy from the circuit. A. Resistance B. Reluctance C. Susceptance D. Admittance |
A. Resistance |
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Soft iron is most suitable for use in a _____. A. Natural magnet B. Permanent magnet C. Magneto D. Temporary magnet |
D.Temporary magnet |
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As the temperature increases, the resistance of most conductors also increases, except _____. A. Silver B. Brass C. Carbon D. Zinc |
C.Carbon |
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Of the six ways of producing EMF, which method is used the least? A. Pressure B. Solar C. Chemical action D. Friction |
D.Friction |
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Resistance in the power formula equals _____. A. E x I B. E2/W C. E2I D. I2/W |
B. E2/W |
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What is the formula to find watt hours? A. E x T x 1000 B. E x I x T C. I x E x T/1000 D. E x T x ø/1000 |
B.E x I x T |
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In the series circuit when the voltage remains constant and the resistance increases, the current _____. A. Increases B. Decreases C. Remains the same D. Increases by the square |
B.Decreases |
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Other factors remaining the same, the effect on the current flow in the circuit would cause the current to _____ if the applied voltage was doubled. A. Double B. Divided by 2 C. Remains the same D. Increased 4 times |
A. Double |
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An operation in which the motor runs when the pushbutton is pressed and will stop when te pushbutton is released. A. Clipping B. Jogging C. Plugging D. Commissioning |
B. Jogging |
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It is not advisable to leave a lead acid storage battery in a discharged state for a long time mainly because A. The plates will become sulphated B. The electrolyte will attack the condenser C. The electrolyte will become weak D. The acid will evaporate |
A. The plate will become sulphated |
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An instrument used to measure temperature A. Thermometer B. Tachometer C. Synchroscope D. Thermocouple |
A. Thermometer |
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What is the angular velocity for a 25-cycle circuit? A. 3.1415 radians per second B. 157 radians per second C. 377 radians per second D. 314 radians per second |
B. 157 radians per second |
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Another name for ac generator. A. Dynamometer B. Alternator C. Dynamotor D. Converter |
B.Alternator |
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How can the phase sequence of three-phase system be reversed? A. By changing sizes of supply conductors B. By improving system power factors C. By increasing generators’ excitation D. By interchanging any two line conductors |
D.By interchanging any two line conductors |
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An electron is _____. A. An orbiting particle B. A proton C. The smallest part of an atom with a positive charge D. A neutron |
A. An orbiting particle |
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The torque of a series motor is directly proportional to? A. The counter EMF B. The armature current C. The square of the counter EMF D. The square of the armature current |
D.The square of the armature current |
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The torque of a series motor is directly proportional to? A. The counter EMF B. The armature current C. The square of the counter EMF D. The square of the armature current |
D.The square of the armature current |
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In a step down transformer, the primary will have? A. Half as many turns B. Fewer turns C. More turns D. Twice as many turns |
C.More turns |
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The specific resistance of a wire depends on _____. I. Its length II. Its material III. Its cross-sectional area A. I and II only B. I, II and III C. I and III only D. II and III only |
B. I, II and III |
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How do you call the negative terminal of the diode? A. Anode B. Cathode C. Triode D. Pentode |
B.Cathode |
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A semi-conductor which is made up of the semi-conductor material in its extremely pure from is A. N-type B. P-type C. Extrinsic D. Intrinsic |
D.Intrinsic |
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If two 100-W, 230 V incandescent lamps are connected in series across a 230-V, what happens? A. Both lamps will get burnt B. Both lamps will consume more power C. Each lamp will give more output lights D. Each lamp will give lesser output lights |
D.Each lamp will give lesser output lights |
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Ammeter which is preferable for high frequency current measurements? A. Hot-wire type B. Permanent-magnet type C. Moving iron type D. Thermocouple type |
D.thermocouple type |
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Which of the following statements is true regarding statements is true series connection of resistance? A. The current flowing through one resistor is equal to the current flowing through the other resistors in the combination B. The voltage drop across one resistor is equal to the voltage drop across the other resistor in the combination C. The power consumed in one resistor is equal to the power consumed in the other resistors in the combination D. All of these |
A. The current flowing through one resistor is equal to the current flowing through the other resistors in the combination |
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Moving coil meters are used in A. Ac circuits B. Dc circuits C. Both ac and dc circuits D. Magnetic circuits only |
B. Dc circuits |
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Which of the following is an outstanding feature of a shunt motor? A. It has a high starting torque B. It has a speed that varies inversely with the load C. It has a constant speed over a wide load range D. It is a low speed type motor |
C. It has a constant speed over a wide load range |
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As a precaution against electric shock, the metal housing of electrically powered hand tools shall be A. Covered with plastic B. Connected to a switch C. Properly grounded D. Isolated |
C.Properly grounded |
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A high school graduate can take the registered master electrician’s examination if he has a subsequent specific record of at least _____ years of apprenticeship in electrical wiring, installation of electrical equipment. A. 6 B. 3 C. 4 D. 5 |
D.5 |
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Which of the following is the electrolyte used in a nickel-iron storage battery? A. Potassium hydroxide B. Sulphuric acid C. Hydrochloric acid D. Calcium |
A. Potassium hydroxide |
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What component of an atom that doesn’t have any electrical charge? A. Electron B. Proton C. Neutron D. Ion |
C.Neutron |
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Excitation current is used in which of the following motors? A. Synchronous motors B. Wound rotor motors C. Induction motors D. Squirrel cage motors |
A. Synchronous motors |
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A simple ohmmeter consists of a meter movement in series with A. An inductor B. A spring C. A capacitor D. A battery |
D.A battery |
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What is the former name of the American Wire Gauge? A. NEMA B. Westinghouse C. Brown and Sharpe D. IEEE |
C.Brown and Sharpe |
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What resistance must be connected across a 4-ohm resistance in order to give an equivalent resistance of 3 ohms? A. 10 ohms B. 8 ohms C. 12 ohms D. 9 ohms |
C 12 ohms |
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What is the resistance reading of a shorted capacitor? A. High resistance B. Zero resistance C. Infinite resistance D. 10 ohm |
B. Zero resistance |
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A wire has a diameter of 0.125 inch. What is its cross-sectional area in circular mils? A. 12,500 B. 22,500 C. 15,625 D. 10,800 |
C. 15,625 |
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In metric standard, what is the unit of constructor sizes? A. AWG B. Circular mils C. mm2 D. cm2 |
C.cm2 |
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Multimeter consist of a _____. A. Voltmeter, current meter and an ohmmeter B. Voltmeter and an ammeter C. Current meter and an ohmmeter D. Voltmeter and current meter |
A. Voltmeter, current meter and an ohmmeter |
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Blue is assigned to what digit value in the resistance color code? A. 5 B. 6 C. 7 D. 4 |
B. 6 |
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Watt-hour is equivalent to how many joules? A. 4,186 B. 3,600 C. C. 44,760 D. 3,415
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B.3,600 |
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If the number of valence electrons is exactly four, how do you classify the material? A. Conductor B. Semi-conductor C. Insulator D. Superconductor |
B.Semi-conductor |
