A&p General 1

Front 1

the working voltage of a capcitor in an ac circuit should be

Back 1

at least 50 percent greater than the highest applied voltage

Front 2

the term that describes the combined resistive forces in an ac circuit is

Back 2

impedance

Front 3

the basis for transformer operation in the use of ac is mutual

Back 3

inductance

Front 4

the opposition offered by a coil to the flow of ac is called

Back 4

inductive reactance

Front 5

an increase in which of the following gactors will cause an increase in the inductive reactance of a circuit

Back 5

inductance and frequency

Front 6

when different rated capacitors are connected in series in a circuit, the total capicatnce is

Back 6

less than the capacitance of the lowest rated capacitor

Front 7

capacitors are sometimes uded in dc circuits to

Back 7

smooth out slight pulsations in current/voltage

Front 8

in an ac circuit, the effective voltage is

Back 8

less than the maximum instantaneous voltage

Front 9

the amount of electricity a capacitor can store is directly proportional to the

Back 9

plate area and inversely proportional to the distance between plates

Front 10

what is the total capacitance of a circuit containing three capacitor is parallel wiht capacitances of .02 microfarad, .05 microfarad, and .10 microfarad respectively

Back 10

.170 uF

Front 11

what is the total capacitance of a certain circuit containing three capacitors with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad respectively

Back 11

.0125 microfarad

Front 12

unless otherwise specified, any values given for the current or voltage in an ac circuit are assumed to be

Back 12

effective values

Front 13

When different rated capacitors are connected in parallel in a circuit, the total capacitance is

Back 13

equal to the sum of all the capacitances

Front 14

8012
when inductors are connectin in a series in a circuit the total inductance is (where the magnetic fields of each inductor do not affect the others)

Back 14

equal to the sum of the individual inductances.

Front 15

8013
When more than 2 inductors of different inductances are conneced in parallel in a circuit the total inductance is

Back 15

less than the inductance of the lowest rated inductor

Front 16

8014
what is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad respectively

Back 16

.4uf
when three capacitors are conneced in parallel their total capacitance is the sum of the individual capacitances.

Front 17

Which requires the most electrical power during operation

Back 17

two lights requireing 3 ampere each in a 24-volt parallel system.

Front 18

8016 how much power must a 24 volt generator furnish to a system which contains the following loads
one motor 75% efficient
three position lights 20 watts each
one heating element 5a
one anticollision light 3a

Back 18

450 watts

Front 19

8017
a 12 volt electric motor has 1,000 watts input and 1 hp output, maintaining the same efficency, how much input power will a 24 volt 1 hp electric motor require

Back 19

1000 watts
The power produced by an electric motor is the product of it voltage and its current

Front 20

8018
how many amperes will a 28 volt generator be required to supply to a circuit containing 5 lamps in parallel, three of whech have a resistance of 6 ohms each and 2 of which have a resistance of 5 ohms each

Back 20

25.23 amps

Front 21

8019
a 1 hp 24v dc electric motor that is 80 percent efficent requires 932.5 watts. how muc power will a 1 hp 12v dc electric motor that is 75% efficient require
1hp=746 watts

Back 21

994.6 watts

divide the wattage for the total horsepower by the decimal equivalent of the efficiency
746/.75 = 994.6 w

Front 22

8020
the potential difference between 2 conductors which are insulated from each other is measured in

Back 22

volts

Front 23

8021
a 24 volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value what is the voltage drop across each resistor

Back 23

24 volts

Front 24

8022
when calculating power in a reactive or inductive ac circuit, the true power is

Back 24

less than the apparent power

Front 25

formula for a resistive circuit

Back 25

p=i2xr

Front 26

8024
what is the impedence of an ac series circuit consisting of an inductor with a reactance of 10 ohms, a capacitor with a reactance of 4 ohms, and a resistor with a resistance of 8 ohms

Back 26

10 ohms

look at this formula

Front 27

8029 the correct way to connect a test voltmeter in a circuit is

Back 27

in parallel with a unit

Front 28

8030
which term means .001 ampere

Back 28

milliampere

Front 29

8031
A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30 volt source. if the voltage across the 10 watt light is measured it will be

Back 29

equial to the voltage across the 20 watt light

Front 30

8032
a 14 ohm resistor is to be installed in a series circuit carrying .05 ampere. how much power will the resistor be required to dissipate

Back 30

at least 35 milliwatts
power dissipated in a resistor is found by multiplying it resistance by the square of the current

Front 31

3033
0..2KV equals

Back 31

2volts

Front 32

8035
a 24 volt source is required to furnish 48 watts to a parallel circuit consisting of 2 resistors of equal value what is the value of each resistor

Back 32

12 ohms

Front 33

3036
which requires the most electrical power
(1hp=746 watts)

Back 33

a 1/5 hp, 24v motor which is 75 percent efficient

Front 34

8037 what unit is used to express electrical power

Back 34

watts

Front 35

8038
what is the operating resistance of a 30 watt light bulb designed for a 28 volt system

Back 35

26 ohms

Front 36

8039
which statement is correct when made in reference to a parallel circuit

Back 36

the total current is equal to the sum of the currents through the individual branches of the circuit

Front 37

8039-1
which of the following are commonly used as rectifiers in electrical circuits
1. anodes
2. cathodes
3 diodes

Back 37

3.

Front 38

8040
diodes are used in elecrtical power supply circuits primarily as

Back 38

rectifiers

Front 39

8041
transfer of electric energy from one circuit to another without the aid of electrical connections

Back 39

is called induction

Front 40

8042
if 3 resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28 volt circuit, how much current will flow through the 3 ohm resistor

Back 40

.93 amps
i=e/r

Front 41

8043
a circuit has an applied voltage of 30 volts and a load consisting of a 10 ohm resistor in series with a 20 ohm resistor what is the voltage drop across the 10 ohm resistor

Back 41

10 v
e=ixr

Front 42

8047
which is correct in reference to electrical resistance

Back 42

if one of three bulbs in a parallel lighting circuit is remove the total resistance of the circuit will become greater

Front 43

8048
what happens to the current in a voltage step up transformer with a reation of 1 to 4

Back 43

the current is stepped down by a 1 to 4 ratio

Front 44

8051
which of these will cause the resistance of a conductor to decrease

Back 44

decrease the length or increase the cross sectional area

Front 45

8052
through which material will magnetic lines of force pass through most readily

Back 45

iron

Front 46

8053
a 48 volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value what is the value of each resistor

Back 46

36 ohms
rt=e2/p

Front 47

8054
which is correct concerning a parallel circuit

Back 47

total resistance will be smaller than the smallest resistor

Front 48

8055
the voltage drop in a circuit of known resistance is dependent on

Back 48

the amperage of the circuit

Front 49

8056
a thermal switch or thermal protecto as usen in an electric motor is designed to

Back 49

open the circuit in order to allow cooling of the motor

Front 50

8072 when referring to an electrical circuit diagram what point is considered to be at zero voltage

Back 50

the ground reference