wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Electrical Fundamentals 3b

Total questions: 152

Worksheet time: 2hrs 41mins

Name
Class
Date
1.

Moving a permanent magnet through a coil of wire will

a)

demagnetize the magnet

b)

the wire will become an electromagnet

c)

the magnet will become electrified

d)

a current will be generated in the wire

2.

Electric currents passing through wires will produce a(n)

a)

solenoid

b)

magnet

c)

magnetic field

d)

insulator

3.

An inductor of inductance 22.0 mH is connected to an a.c. supply with frequency f. If the reactance of the inductor is 660 Ω, what is the value of f?

a)

1.45 ×103 \times10^3\ Hz

b)

3.00undefined Hz

c)

4.77undefined Hz

d)

7.16undefined Hz

4.

The variation of voltage across an inductor with time t in an a.c. circuit is as shown in the graph. Which graphs shows the variation of the current I which flows through the inductor with time t?

a)
b)
c)
d)
5.

A Capacitor blocks

a)

Only a.c.

b)

Only d.c.

c)

Both ac and dc

d)

None of these

6.

What happens at resonance?

a)

Current is maximum

b)

Impedance is maximum

c)

Resistance is maximum

d)

Power factor is maximum

7.
The function of a generator is to change ____. 
a)
mechanical energy to electrical energy
b)
electrical energy to mechanical energy 
c)
electrical energy to chemical energy
d)
chemical energy to electrical energy 
8.

If the frequency of the AC voltage across an inductor is doubled, the inductive reactance of that inductor

a)

increases to 4 times its original value.

b)

increases to twice its original value.

c)

decreases to one-half its original value.

d)

decreases to one-fourth its original value.

9.

A pure inductor is connected to an AC power supply. In this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers.

10.

A resistor is connected to an AC power supply. On this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers

11.

Which one of the below AC parameters shows the effective DC value?

a)

Peak Value

b)

RMS value

c)

Peak to peak value

d)

Frequency

12.

The repetition of a variable quantity, recurring at equal intervals, is known as ___________

a)

Waveform

b)

Instantaneous value

c)

Cycle

d)

Period

13.

What is the duration of one cycle known as _________

a)

Waveform

b)

Peak value

c)

Instantaneous value

d)

Period

14.

The most common waveforms of ac is

a)

square wave

b)

triangular wave

c)

complex wave

d)

sine wave

15.

The unit of frequency is

a)

Cycle

b)

Cycle-second

c)

Hertz/second

d)

Hertz

16.

Alternating voltage (V) is represented by the equation

a)

V(t) = Vm eωt

b)

V(t) = Vm sin ωt

c)

V(t) = Vm cot ωt

d)

V(t) = Vm tan ωt

17.

The maximum instantaneous value measured from zero value is known as?

a)

Peak value

b)

Peak to peak value

c)

Cycle

d)

Period

18.

The value of a given waveform at any instant time is termed as ___________

a)

Waveform

b)

Instantaneous value

c)

Cycle

d)

Period

19.

Electromagnetic Induction is ...

a)

The process of inducing an emf (voltage) with a change in magnetic flux

b)

Electric currents whose direction and magnitude change periodically depending on time are called alternating current

c)

Steady current which delivers the same average power as the a.c. to a resistive load.

d)

Making a rectified current more steady (or smooth) by placing a capacitor in parallel with the resistor

20.

What is alternating current

a)

the process of inducing an emf (voltage) with a change in magnetic flux

b)

Electric currents whose direction and magnitude change periodically depending on time

c)

Steady current which delivers the same average power as the a.c. to a resistive load.

d)

Making a rectified current more steady (or smooth) by placing a capacitor in parallel with the resistor

21.

Transformer is always connected to ___________ supply.

a)

A.C.

b)

D.C.

22.

A transformer has primary voltage 200V and secondary voltage 100V, the transformer is called _______.

a)

Step up

b)

Step Down

c)

None

23.

Electrical symbol of a TRANSFORMER

a)
b)
c)
24.

Thin laminated sheets of Iron are used instead of solid block to:

a)

Increase resistance in core

b)

Reduce the eddy current effect

c)

Reduce the amount of magnetic flux

25.

This picture is an example of a ___________

a)

Step-Up Transformer

b)

Step-Down Transformer

c)

DC Motor

d)

AC Generator

26.

Calculate potential difference in the secondary coil based on the information given below.


Vp = 240 V

Np = 20

Ns = 125

Vs ?

a)

1500

b)

500

c)

1000

d)

2000

27.

Why transformers work with A.C. current but not D.C.

a)

A.C current produces changing magnetic field.

b)

D.C current produces changing magnetic field.

c)

D.C current is weak

d)

A.C current is powerful

28.

A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

a)

480V

b)

30V

c)

20V

d)

450V

29.

The function of a transformer is to ...

a)

raise and lower the apparent power levels

b)

transfer DC voltage from the primary winding to the secondary winding

c)

increase or decrease A.C voltage or A.C current levels

d)

transform mechanical energy into electrical energy

30.

The magnetic material for the core needs to be made of soft iron where its permeability is high

a)

to reduce eddy current loss

b)

to reduce hysteresis loss

c)

to avoid fringing in the core

d)

to reduce copper loss in the winding

31.

Transformer works on which of the following principle

a)

Lenz's Law

b)

Ampere's Law

c)

Faraday's Law of Electromagnetic Induction

d)

Fleming's Law

32.

In order for electromagnetic induction to occur, there must be relative between a magnetic field and a conductor.

a)

race

b)

Motion

c)

field

d)

voltage

33.

Ratio of voltages is equal to ratio of _______________________.

a)

number of iron sheets in core

b)

number of coil

c)

number of turns in coil

d)

number of electromagnetic

34.

Laminated insulation is normally used in the transformer:

a)

To reduce the hysteresis effect

b)

To increase the hysteresis effect

c)

To reduce the effect of eddy current

d)

To increase the effect of eddy current

35.

A transformer does not change the following:

a)

Frequency

b)

Voltage

c)

Current

d)

None of these

36.

If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is:

a)

200 W

b)

75 W

c)

50 W

d)

100 W

37.

Assume primary has 240 turns and secondary has 60 turns. Primary is connected with 120V AC power supply. What is the voltage on the secondary?

a)

30 V

b)

0.333 V

c)

2 V

d)

120V

38.

A step up transformer has its primary winding to secondary winding ratio

a)

Greater than 1

b)

Equal to 1

c)

Less than 1

d)

Unknown

39.

Efficiency of a transformer is

a)

(output current)/(input current) x100%

b)

(output voltage)/(input voltage) x100%

c)

(output loss)/(input loss) x100%

d)

(output power)/(input power) x100%

40.

What kind of filter is shown in the figure ?

a)

Low Pass Filter

b)

High Pass Filter

c)

Band pass filter

41.

A low pass filter is

a)

Passes the frequencies lower than the specified cut off frequency

b)

Rejects Lower frequencies

c)

Allows the higher frequencies

d)

All of the above

42.

A ________ filter significantly attenuates all frequencies below fc and passes all frequencies above fc.

a)

Low pass

b)

High Pass

c)

Band Pass

d)

Band Stop

43.

Which of the graphs below shows the characteristics for the circuit shown?

a)
b)
c)
d)
e)
44.

Which of the graphs below shows the characteristics for the circuit shown?

a)
b)
c)
d)
e)
45.

Find out the low pass filter from the given frequency response characteristics.

a)
b)
c)
d)
46.

This phasor diagram for:

a)

R

b)

L

c)

C

d)

X

47.

This phasor diagram for:

a)

R

b)

L

c)

C

d)

X

48.

This phasor diagram for:

a)

R

b)

L

c)

C

d)

X

49.

In a series circuit current must be

a)

constant for each element

b)

cosine graph in all 3 components

c)

different for each element

50.

Write an equation that solves for the impedance,   ZtotalZ_{total}  , of this series circuit.

a)

Ztotal=R2+X2Z_{total}=\sqrt{R^2+X^2}  

b)

Ztotal=R2−X2Z_{total}=\sqrt{R^2-X^2}  

c)

Ztotal=R2+X2Z_{total_{ }}=R^2+X^2  

d)

Ztotal=R2−X2Z_{total}=R^2-X^2  

51.

A resistor is connected to an AC power supply. On this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers

52.

A pure inductor is connected to an AC power supply. In this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers.

53.

If the frequency of the AC voltage across an inductor is doubled, the inductive reactance of that inductor

a)

increases to 4 times its original value.

b)

increases to twice its original value.

c)

decreases to one-half its original value.

d)

decreases to one-fourth its original value.

54.

A pure capacitor is connected to an AC power supply. In this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers

55.

What is the phase angle between the voltages of the inductor and capacitor in a RLC series circuit?

a)

zero

b)

90°

c)

180°

d)

270°

56.

A capacitor 120 µF is connected to an AC source of 6 V with frequency 100 Hz. If the frequency is increased to 200 Hz, the reactance of the capacitor will be

a)

half the original value.

b)

same as the original value.

c)

two times the original value.

d)

the reciprocal of the original value.

57.

If an electric bulb is connected to an AC source, which of the following statement is true about the phase difference between the voltage across the bulb and current flowing in it?

a)

In phase.

b)

Not in phase.

c)

The voltage is leading the current.

d)

The current is leading the voltage.

58.

Which one of the below AC parameters show the effective Dc value?

a)

Peak Value

b)

RMS value

c)

Peak to peak value

d)

Frequency

59.

A sine wave has a peak value of 354 V, What is the RMS value?

a)

250 V

b)

500 V

c)

354 V

d)

200V

60.

What is the Peak voltage of the signal shown on the multimeter?

a)

1000 V

b)

1414 V

c)

1500 V

d)

707 V

61.
The sum of resistance and reactance is referred to as ________. 
a)
geometric resistance 
b)
conductance 
c)
 impedance 
d)
 susceptance 
62.

The opposition to AC current flow presented by capacitors and inductors is called:

a)

Resistance

b)

Reactance

c)

Impedance

d)

Reluctance

63.

In RLC circuit, If R is the resistance, XL is the inductive reactance and XC is the capacitive reactance, the impedance Z of the circuit is:

a)
b)
c)
d)
64.

Which of the following statements about a series RCL circuit is true?

a)

At resonance, the total reactance and total resistance are equal.

b)

The impedance at resonance is purely inductive.

c)

The current flowing in the circuit at resonance is at maximum.

d)

The impedance at resonance is at maximum.

65.
In an RLC circuit, power loss can take place in
a)
R
b)
L
c)
C
d)
L and C
66.

Average power dissipated in an ideal inductor in a.c. circuit is:

a)

Infinite

b)

100

c)

0

d)

1

67.

The formula for inductive reactance is _____.

a)

XL = 1 ÷ 2πfL

b)

XL = 2 ÷ πfL

c)

XL = 2π ÷ fL

d)

XL = 2πfL

68.

If period T=0.02s, frequency is

a)

50Hz

b)

2 Hz

c)

10 Hz

69.

Which of the following statements about capacitive reactance is true?

a)

It is independent of capacitance

b)

It is very small at low frequencies

c)

decreases with increasing capacitance

d)

increases with increasing capacitance

70.

The current in an inductor connected to an AC voltage source lags the voltage. The lag is caused by the ____.

a)

back emf in the coil

b)

resistance of the coil

c)

voltage across the coil

d)

frequency of the source

71.

When a particular inductor is connected to a source of sinusoidal varying voltage with constant amplitude and a frequency of 60.0 Hz, the rms current is 3.0 A. What is the rms current if the source frequency is doubled?

a)

1.5A

b)

3.0 A

c)

4.2 A

d)

6.0 A

72.

In a no-load condition of a transformer, the current in the primary coil is:

a)

Very Small

b)

Very Large

c)

Infinite

73.

Which of the following is/are true regarding a series RLC circuit?

a. A capacitor will be dominant at higher frequencies

b. an inductor will be dominant at higher frequencies

c. Maximum current flows through the circuit at the resonant frequency

a)

a and c

b)

b and c

c)

a and b

d)

all of the above

74.

In a series resonance circuit, the following parameter is super elevated at coil and capacitor:

a)

current

b)

resistance

c)

voltrage

75.

In a series LRC circuit, if the capacitive reactance is equal to the inductive reactance, what is the phase angle between current and voltage?

a)

0

b)

60

c)

90

d)

180

76.

What is the unit for capacitative reactance?

a)

Farad

b)

Ohm

c)

Henry

d)

Ohm Farad

77.

What is impedance?

a)

resistance

b)

the sum of resistance and total reactance

c)

the vector sum of resistance and total reactance

d)

the sum of capacitative and inductive reactance

78.

What are the symbols for impedance, reactance and resistance?

a)

X, Z, R

b)

X, Y, R

c)

Z, X, R

d)

Z, R, X

79.

An LRC resonates when the applied frequency is equal to

a)

LC\sqrt{LC}  

b)

1LC\frac{1}{\sqrt{LC}}  

c)

2πLC\frac{2\pi}{\sqrt{LC}}  

d)

12πLC\frac{1}{2\pi\sqrt{LC}}  

80.

If the inductive reactance is smaller than the capacitive reactance, then the current

a)

lags the supply voltage

b)

leads the supply voltage

c)

is in phase with the supply voltage

d)

leads the resistor voltage

81.

In order for electromagnetic induction to occur, there must be relative............between a magnetic field and a conductor.

a)

race

b)

Motion

c)

field

d)

voltage

82.

The magnetic field produced by an alternating current can be thought of as a ............................... magnetic field.

a)

moving magnetic field

b)

dynamic magetic field

c)

electrodynamic magnetic field

d)

magnetic field

83.

If a transformer reduces voltage, it is called a....................... transformer.

a)

step left

b)

step right

c)

step up

d)

step down

84.

Why transformers work with A.C. current but not D.C.

a)

A.C current produces changing magnetic field.

b)

D.C current produces changing magnetic field.

c)

D.C current is weak

d)

A.C current is powerful

85.

Which of the following does not change in a transformer?

a)

Voltage

b)

Current

c)

Power

d)

Frequency

86.

This picture is an example of a ________________.

a)

Motor

b)

Generator

c)

Step-up transformer

d)

Step-down transformer

87.

Ratio of voltages is equal to ratio of _______________________.

a)

number of iron sheets in core

b)

number of coil

c)

number of turns in coil

d)

number of electromagnetic

88.

A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

a)

480V

b)

30V

c)

20V

d)

450V

89.

The function of a transformer is to ...

a)

raise and lower the apparent power levels

b)

transfer DC voltage from the primary winding to the secondary winding

c)

increase or decrease A.C voltage or A.C current levels

d)

transform mechanical energy into electrical energy

90.

The magnetic material for the core needs to be made of soft iron where its permeability is high

a)

to reduce eddy current loss

b)

to reduce hysteresis loss

c)

to avoid fringing in the core

d)

to reduce copper loss in the winding

91.

Transformer works on which of the following principle

a)

Lenz’s Law

b)

Ampere's Law

c)

Faraday's Law of Electromagenetic Induction

d)

Fleming's Law

92.

A transformer has primary voltage 200V and secondary voltage 100V , the transformer is called _______ .

a)

Step up

b)

Step Down

c)

None

93.

For a transformer copper losses are also known as

a)

variable loss

b)

iron loss

c)

eddy current loss

d)

losses in shunt parameter

94.

The sum of Hysteresis and Eddy current losses are also called

a)

Ohmic loss

b)

Heat loss

c)

Copper loss

d)

Constant loss

95.

The unit for measuring Inductance (L) is

a)

Henry

b)

Weber

c)

Tesla

96.

The current caused by an induced voltage always opposes the cause of the induction. This law is called:

a)

Lenz's Law

b)

Henry's Law

c)

Faraday's Law

97.

The Diodes connected parallel to the inductor coil to prevent the extremely high current when switched off, is called:

a)

Free Wheeling Diodes

b)

Photocells

c)

Light Emitting Diodes

98.

In the given figure ,If the current the first coil increased,what will happen to the induced voltage in the second coil

a)

Increase

b)

Decrease

c)

No effect

99.

If an Alternating Current (A.C.) takes 10 seconds to complete 1 Cycle. Calculate the frequency:

a)

0.1 Hertz

b)

0.01 Hertz

c)

10 Hertz

100.

In the given figure, which coil will have maximum induced voltage

a)

S2

b)

S1

c)

S3

101.

The average value of Alternating current of a full sinusoidal cycle is

a)

Zero

b)

One

c)

Infinite

102.

The distance that an Alternating Current (A.C.) travels in time period "T" is called

a)

Wave length

b)

Frequency

c)

Amplitude

103.

If the peak to peak  value of an Alternating Current is 4 Amperes (A). The Root Mean Square (RMS) Value would be:

a)

1.414 A

b)

2.828 A

c)

0.707 A

104.

On aircraft, the Alternating Current (A.C.) Voltages found are:

a)

115 Volts and 200 Volts

b)

28 Volts and 26 Volts

c)

50 Volts and 100 Volts

105.

In a circuit with inductive reactance, the current lags the applied voltage by:

a)

90 Degrees

b)

180 Degrees

c)

60 Degrees

106.

A coil with an inductance of 10 H is applied to an AC voltage of U = 230, f = 50 Hz. Calculate the inductive reactance. (Pie value = 3.14)

a)

3140 ohms

b)

314 ohms

c)

1140 ohms

107.

A capacitor with a capacitive reactance of 800 ohms is applied to an AC voltage U = 400 V. What is the current?

a)

0.5 Amperes

b)

2 Amperes

c)

1 Amperes

108.

Regarding the relationship between frequency (f) and effective resistance (R):

a)

R is independent upto 1000 Hz

b)

R is directly proportional

c)

R is inversely proportional

109.

If the Peak value of an Alternating Current is 4 Ampere, Find the Peak Value

a)

1.414 A

b)

2 A

c)

0.707 A

110.

An inductor consisting of ohmic resistance and inductive reactance is applied to 115 V AC. Its current is 1 A. What is the impedence?

a)

115 Ohms

b)

230 Ohms

c)

460 Ohms

111.

If Resistor, Coil and Capacitor are connected in series, the Capacitive Voltage and Inductive Voltage have a phase angle of?

a)

180 degrees

b)

90 degrees

c)

0 degree

112.

At resonace condition in a RLC serires circuit, the impedance will be

a)

Minimum

b)

Maximum

c)

No effect

113.

The given graph reflects which kind of power?

a)

True Power

b)

Reactive Power

c)

Apparent Power

114.

The Power of Alternating Current (A.C.) Generators and Transformers is given in: 

a)

Volt Ampere (VA)

b)

Volt-Ampere-Reactive (Var)

c)

Watts

115.

The special frequency where the Inductive Reactance and Capacitive Reactance cancel out each other is called:

a)

Resonance Frequency

b)

Cut Out Frequency

c)

Super Elevated Frequency

116.

The Parallel Resonant Circuit blocks certain frequency and therefore is known as:

a)

Rejector Circuit

b)

Absorption Circuit

c)

Acceptor Circuit

117.

Which filters are commonly used because of their compact design and lower price:

a)

CR-Filters

b)

LR-Filters

c)

CL-Filters

118.

The filters which let voltages with high frequencies (above cut off frequency) easily pass is known as:

a)

High-Pass Filters

b)

Low-Pass Filters

c)

Easy-Pass Filters

119.

Which filters are used in smoothing circuits to cancel out the unintended AC parts in a rectifier:

a)

Low Pass Filters

b)

High Pass Filters

c)

Rectified Pass Filters

120.

The filters which let all frequencies pass, apart from a particular frequency band (channel) is called:

a)

Band-Stop Filters

b)

Band-Pass Filters

c)

All-Pass Filters

121.

The Turns Ratio in a Transformer is calculated by the formula:

a)

N1/N2

b)

N1 + N2

c)

N1 - N2

122.

Calculate voltage in the secondary coil based on the information given below.


Vp = 240 V

Np = 20

Ns = 125

Vs ?

a)

1500 Turns

b)

1500 V

c)

1500A

123.

LAMINATED CORE IN A TRANSFORMER IS TO REDUCE THE -------LOSS

a)

COPPER LOSS

b)

EDDY CURRENT LOSS

c)

HYSTERESIS LOSS

d)

DIELECTRIC LOSS

124.

What happens when Induction motor runs at synchronous speed, motor will:

a)

Delivers real Power

b)

Stops

c)

Burn

d)

Delivers Reactive Power

125.

In aircraft, generators are mainly driven by the?

a)

Engine

b)

Rectifiers

c)

Transformers

126.

In large synchronous machine, field winding is placed on ______ and ac supply on ______

a)

Rotor, Stator

b)

Armature, Slots

c)

Stator, Rotor

d)

pole shoes, stator

127.

Which factor is not considered for synchronization?

a)

Voltage

b)

Current

c)

Frequency

d)

Phase Sequence

128.

Which of the following supply is given to the rotor winding of 3-Phase Induction Motor:

a)

DC

b)

No Supply but by induction

c)

pulsating supply

d)

AC

129.

Which of the following supply is given to the rotor winding of 3-Phase Induction Motor:

a)

DC

b)

No Supply but by induction

c)

pulsating supply

d)

AC

130.

A Synchronous Machine having 4 poles and supplied with 60 Hz supply will rotate at ___:

a)

1500

b)

3000

c)

3600

d)

1800

131.

What is the test conducted on a transformer to know the copper loses

a)

Open-circuit test

b)

Short circuit test

c)

Sumpners test

d)

Polarity test

132.

In a shaded pole motor, shading coils are using to

a)

reduce winding losses

b)

reduce friction losses

c)

produce rotating magnetic field

d)

protect against sparking

133.

The capacitor in a capacitor-start induction run ac motor is connected in series     with

a)

starting winding

b)

running winding

c)

squirrel cage winding

d)

compensating winding

134.

why is a centrifugal switch  used in a 1-ph induction motor

a)

To protect the motor from overloading

b)

To improve the starting performance of the motor

c)

To cut off the starting winding at an appropriate instant

d)

d)    To cut in the capacitor during running conditions

135.

A 6000 rpm generator producing 400 Hz has how many pole pairs?

a)

4

b)

3

c)

6

136.

In Aeroplanes, which types of A.C. (Alternating Current) Motors are often found?

a)

Three Phase Asynchronous Motors

b)

Three Phase Synchronous Motors

c)

Two Phase Asynchronous Motors

137.

The distance that the electrical current travels in the cycle time (T) is called:

a)

Wavelength

b)

Frequency

c)

Amplitude

138.

At the same voltage, the higher the frequency the _____________ the components can be:

a)

Smaller

b)

Bigger

c)

Heavier

139.

The other name for the Shaded-Pole Motor is

a)

Split Pole Motor

b)

Capacitor Motor

c)

Inductor Motor

140.

The following impedance circuit shows the characteristics of a

a)

Series resonance circuit

b)

Parallel resonance circuit

c)

None of the above

141.

The following impedance circuit shows the characteristics of a

a)

Series resonance circuit

b)

Parallel resonance circuit

c)

None of the above

142.

When can we use the 3-phase star connection without the neutral line?

a)

When all the three loads are symmetrical

b)

When all the three loads are asymmetrical

c)

When load in one phase is higher than the other phases

143.

According to Faraday's Law of Induction, the induced voltage in a coil is proportional to?

a)

The resistance of the coil

b)

The rate of change of magnetic flux

c)

The capacitance of the coil

144.

The inductance of a coil increases with:

a)

Decreasing number of turns

b)

Increasing number of turns

c)

Decreasing cross-sectional area

145.

The self-induced voltage in a coil is also known as:

a)

Back EMF

b)

Forward EMF

c)

Mutual EMF

146.

The phenomenon of inducing a voltage in a conductor by changing the magnetic field around it is called:

a)

Electromagnetic induction

b)

Electrostatic induction

c)

Electroplating

147.

The power factor in an AC circuit is defined as:

a)

The ratio of real power to apparent power

b)

The ratio of apparent power to real power

c)

The product of real power and apparent power

148.

Synchronous machines operate with slip of

a)

1

b)

0

c)

5

149.

Frequency of generator:

a)

Depends on speed & pole pairs

b)

Only volume

c)

Only current

150.

A step‑down transformer has

a)

N1 > N2

b)

N1 < N2

c)

N1 = N2

151.

Split‑pole motors use:

a)

Shading Coil

b)

Inductor

c)

Resistor

152.

Direction of rotation reversed by:

a)

Interchanging any 2 phases

b)

Changing 3 leads

c)

Blocking rotor

Similar Resources on Wayground

hardest blox fruit quiz(you cant win this quiz)

150 questions

hardest blox fruit quiz(you cant win this quiz)

quiz

Worksheet

•

KG - Professional Dev...

Final militar

151 questions

Final militar

quiz

Worksheet

•

University

Quiz of Software PM in RitaBook

156 questions

Quiz of Software PM in RitaBook

quiz

Worksheet

•

University - Professi...

Ekonomi Energi Listrik

150 questions

Ekonomi Energi Listrik

quiz

Worksheet

•

University

PENGETAHUAN UMUM 1

150 questions

PENGETAHUAN UMUM 1

quiz

Worksheet

•

University

Quiz on Derivatives and NCDEX

151 questions

Quiz on Derivatives and NCDEX

quiz

Worksheet

•

University

инновация сессия 2

149 questions

инновация сессия 2

quiz

Worksheet

•

University

KTCT

153 questions

KTCT

quiz

Worksheet

•

University