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Fundamentals Of Electric Circuit

Total questions: 138

Worksheet time: 1hrs 9mins

Name
Class
Date
1.

Which of the following appliances do NOT require electricity

a)

Table lamp

b)

Refrigerator

c)

Computer

d)

Cooking stove

2.

Through which of the following does the electricity flow?

a)

Pipe

b)

Chimney

c)

Copper wire

d)

Tube

3.

Which of the following is NOT an example of static electricity?

a)

Charging of mobile phone

b)

Lightning

c)

Rubbing a balloon on your hair

d)

Clothes tumbling in dryer

4.

Which of the following is a bad conductor of electricity?

a)

Copper wire

b)

Wood

c)

Salt water

d)

Gold

5.

Out of the following, which one is not a source of electrical energy?

a)

Solar Cell

b)

Battery

c)

Potentiometer

d)

Generator

6.

What is the SI unit of charge?

a)

Coulombs

b)

Voltage

c)

Watt

d)

Amps

7.

What type of current does a battery give?

a)

Alternating current

b)

Rotating current

c)

Static current

d)

Direct current

8.

What do we mean when we say electric current is flowing?

a)

Atoms are moving

b)

Heat is flowing

c)

Charge is flowing

d)

Protons are flowing

9.

How much of current flowing through the body can cause cardiac arrest?

a)

5mA

b)

10mA

c)

20mA

d)

50mA

10.

Power is the rate of doing work. A bulb has a power of 200W. What is the energy dissipated by it in 5 seconds?

a)

200J

b)

1000J

c)

40J

d)

5J

11.

Power is the rate of doing work. A bulb has a power of 200W. What is the energy dissipated by it in 5 minutes?

a)

60kJ

b)

200J

c)

1kJ

d)

10kJ

12.

A water pump consumes 2kJ of energy in 10 seconds. What is the wattage of the motor?

a)

2000W

b)

20kW

c)

10W

d)

200W

13.

In how many seconds will a 500W motor consume 5kJ of energy?

a)

10 Seconds

b)

5 seconds

c)

500 seconds

d)

100 seconds

14.

What quantities do you need to calculate energy?

a)

Current and Voltage

b)

Resistance and current

c)

Power and time

d)

Power and Voltage

15.

How many kilowatts are in 6500 W?

a)

65kW

b)

6.5kW

c)

.65kW

d)

.065kW

16.

Voltage source and terminal voltage can be related as ___________

a)

Terminal voltage is higher than the source emf

b)

Terminal voltage is equal to the source emf

c)

Terminal voltage may exceed source emf

d)

Terminal voltage is always lower than source emf

17.

In case of ideal current sources, they have ___________

a)

Zero internal resistance

b)

Low value of voltage

c)

Large value of current

d)

Infinite internal resistance

18.

Ideal current source has infinite resistance. For a current source to be neglected, the terminals across the source should be ___________

a)

Replaced by inductor

b)

Replaced by some resistance

c)

Open circuited

d)

Short circuited

19.

In case of ideal voltage sources, they have ___________

a)

Zero internal resistance

b)

Low value of voltage

c)

Large value of current

d)

Infinite internal resistance

20.

Ideal voltage source has zero resistance. For a voltage source to be neglected, the terminals across the source should be ___________

a)

Replaced by inductor

b)

Replaced by some resistance

c)

Open circuited

d)

Short circuited

21.

In India with what voltage do the electrical appliances work?

a)

110 V D C

b)

230 A C

c)

0 - 5 V

d)

None of these

22.

Electrical technology does NOT deal with which one of the following?

a)

Generation

b)

Storage

c)

Amplifying

d)

Distribution

23.

Mobile is an example of which type of device?

a)

Electrical

b)

Electronic

c)

Electrical or Electronic

d)

Information technology

24.

Using old and new batteries together is ________.

a)

Not good

b)

Good

c)

Not effects to battery

d)

Will not work

25.

What will happen if the battery is wrongly connected on charge?

a)

Current delivered by the battery will be high

b)

Current drawing will be Nil

c)

Current drawing will be very small

d)

Current drawing will be very high

26.

While preparing electrolyte for a lead-acid battery ________

a)

Water is poured into acid

b)

Anyone of the two can be added to other chemical

c)

Acid is poured into water

d)

Water is not required

27.

What electrolyte is used in lead-acid cell?

a)

NaOH

b)

Only H2SO4

c)

Only water

d)

Dilute H2SO4

28.

Level of electrolyte in a cell should be ______ the level of plates.

a)

Below

b)

Equal to

c)

Above

d)

Does not matter

29.

The power sources which are required to be connected in parallel, must have the ---- Voltage rating.

a)

Same

b)

Higher

c)

Lower

d)

Double

30.

We have batteries of 2V, 200Ah. We require to 12V supply. How many batteries and how should they be connected?

a)

6 batteries in parallel

b)

6 batteries in series

c)

12 batteries in series

d)

3 in series and 3 in parallel

31.

We have batteries of 2V, 200Ah. 6 of them are connected in series. What is the output voltage and the rating?

a)

2V, 200Ah

b)

12V, 1200Ah

c)

12 V, 200Ah

d)

2V, 1200Ah

32.

Five 12V, 200Ah batteries are connected in parallel. What is the output voltage and the rating?

a)

12V, 200Ah

b)

12V, 1000Ah

c)

50V, 200Ah

d)

50V, 1000Ah

33.

We have batteries of 12V, 200Ah. We require to 1000Ah capacity. How many batteries and how should they be connected?

a)

5 batteries in parallel

b)

5 batteries in series

c)

10 batteries in series

d)

2 in series and 2 in parallel

34.

The +ve terminal of a 12V battery is connected in series to +ve terminal of 9V battery. What output voltage do we get?

a)

21V

b)

9V

c)

12V

d)

3V

35.

The +ve terminal of a 12V battery is connected in series to -ve terminal of 9V battery. What output voltage do we get?

a)

21V

b)

9V

c)

12V

d)

3V

36.

The capacity of a battery is expressed in terms of

a)

Current rating

b)

Voltage rating

c)

Ampere hour rating

d)

In watts

37.

For how much time will a 1Ah battery give 1A current?

a)

1 minute

b)

1 sec

c)

1 hour

d)

10 minutes

38.

For how much time will a 40Ah battery give 2A current?

a)

40 hours

b)

80 hours

c)

2 hours

d)

20 hours

39.

A water pump requires 4 amps current. What minimum capacity battery must be connected to run the motor for 15 minutes?

a)

1 Ah

b)

15Ah

c)

4 Ah

d)

60Ah

40.

A mobile has 3000mAh battery. If the mobile consumes 20mA current, then how long will the battery last?

a)

20 hours

b)

60 hours

c)

50 hours

d)

24 hours

41.

Capacity of dry cells is ____

a)

More when it is supplying current for intermittent periods

b)

More when it is supplying current for continuous period

c)

Unaffected by the type of discharge

d)

More when it is supplying heavy current

42.

Shelf Life of a small dry cell is

a)

Equal to that of larger dry cell

b)

Less than that of large dry cell

c)

More than that of large dry cell

d)

May be more or less

43.

Which of the following primary cells has the highest voltage?

a)

Manganese-alkaline

b)

Carbon-zinc

c)

Lithium

d)

Mercury

44.

The electrode for a battery must be

a)

A semi conductor

b)

An insulator

c)

A good conductor of electricity

d)

A bad conductor of electricity

45.

Why are cells connected in series?

a)

Increase the voltage rating

b)

Increase the current rating

c)

Increase the life of the cells

d)

Increase efficiency

46.

Five 2V cells are connected in parallel. What will be the output voltage?

a)

1V

b)

1.5V

c)

1.75V

d)

2V

47.

Why do cells have vent cap on them?

a)

To allow gases out when the cell is on charge

b)

To add water to the cell if needed

c)

To check the level of electrolyte

d)

To check the level of electrolyte

48.

What type of energy conversion takes place in a cell?

a)

Chemical to electrical

b)

Mechanical to electrical

c)

Potential to electrical

d)

Electrical to chemical

49.

What type of cell gives power by an irreversible chemical reaction?

a)

Reserve cell

b)

Solar cell

c)

Primary cell

d)

Secondary cell

50.

Battery container should be acid resistant. What material is used for making battery containers?

a)

Glass

b)

Plastic

c)

Wood

d)

All of the mentioned

51.

What type of cell gives power by reversible chemical reaction?

a)

Reserve cell

b)

Solar cell

c)

Primary cell

d)

Secondary cell

52.

X is used at 10% DoD, while battery Y is used at 80% DoD. Which battery will have better Cyclic life?

a)

X

b)

Y

c)

Both will have same life

d)

Can not predict

53.

In superposition theorem, when we consider the effect of one voltage source, all the other voltage sources are ____________

a)

Shorted

b)

Opened

c)

Removed

d)

Undisturbed

54.

In superposition theorem, when we consider the effect of one current source, all the other current sources are ____________

a)

Shorted

b)

Opened

c)

Removed

d)

Undisturbed

55.

Superposition theorem does not work for ________

a)

Current

b)

Voltage

c)

Power

d)

Works for all: current, voltage and power

56.

A 2k ohm is connected in series with 3k ohm. 6k ohm is connected in parallel to 3k ohm. What is the resultant of these three resistances?

a)

11k ohm

b)

4k ohm

c)

5k ohm

d)

9k ohm

57.

A 2k ohm is connected in parallel with 1k ohm. 6k ohm is connected in parallel to 3k ohm. The two are connected in series. What is the resultant of these four resistances?

a)

12k ohm

b)

2.66 ohm

c)

6.66 ohm

d)

2.33 ohm

58.

One terminal of 4, 8 and 2 ohm resistances are connected to form one node. The -ve terminals of 48V and 24V power sources are connected to the free end of 2ohm. The +ve terminal of 48V is connected to 4 ohm and that of 24V is connected to 8 ohm free terminals. What is current flowing through 2 ohm resistance?

a)

6.86A

b)

1.71A

c)

5.15A

d)

8.57A

59.

One terminal of 4, 8 and 2 ohm resistances are connected to form one node. The +ve terminal of 48V is connected to 4ohm and -ve terminal to 2 ohm. A current source of 3A is connected between 2 and 8 ohms such that current is flowing in to 8 ohm. What is current flowing through 4 ohm resistance?

a)

3A

b)

10A

c)

8.57A

d)

7A

60.

1k, 2k and 3k ohm are connected in series with a 48V power supply. What voltages appear across each of the resistances?

a)

1V, 2V and 3V

b)

8V, 16V and 24V

c)

16V, 16V and 16V

d)

10V, 20V, and 30V

61.

3 circuit elements are connected to a node in a circuit. 2.5A current is flowing into the node through 3k Ohms. 2A current is flowing from the node towards 2.2k ohms. How much current and in what direction is the current flowing in the third element of 3.3k ohms?

a)

2.5A into the node from the resistance

b)

0.5A into the node from the resistance

c)

0.5A from the node towards resistance

d)

2.5A from the node towards resistance

62.

4 circuit elements are connected to a node in a circuit. 1.5A current is flowing into the node through each two 3k Ohms. 4A current is flowing from the node towards 1k ohms. How much current and in what direction is the current flowing in the fourth element of 2.2k ohms?

a)

1.5A into the node from the resistance

b)

1A into the node from the resistance

c)

1A from the node towards resistance

d)

1.5A from the node towards resistance

63.

In KVL the algebraic sum of all voltages within the loop must be equal to ----------------

a)

V=IR

b)

twice

c)

unity

d)

zero.

64.

A 80V battery is supplying power to a 24V fan and a 36V bulb connected in series. You have to connect a motor in series. What voltage motor can be connected?

a)

20V

b)

24V

c)

36V

d)

80V

65.

20k and 30k ohm resistances are connected in series. The +V terminal of 8V battery is connected to the free end of 20k ohm resistance. The +V terminal of 3V battery is connected to the free end of 30k ohm resistance. The -ve terminals of both batteries are shorted. If the voltage drop across 20k ohms is 2V, what is the voltage drop across 30k ohms?

a)

3V

b)

8V

c)

2V

d)

11V

66.

A 12V battery is connected to 3k ohm resistance. What current is flowing in the cirvcuit?

a)

4 mA

b)

4A

c)

.04A

d)

.4A

67.

A 12V battery is supplying 2A of current to a mini motor. What is the resistance of the motor?

a)

12 ohms

b)

8 ohms

c)

6 ohms

d)

4 ohms

68.

A hair drier of 9.6 ohms requires 10A current. How much voltage does the drier require?

a)

96V

b)

12V

c)

10V

d)

9.6V

69.

The point where the terminals of two or more circuit elements meet is called _________

a)

branch

b)

node

c)

loop

d)

tree

70.

A ------------- is any closed path in a circuit.

a)

branch

b)

node

c)

loop

d)

tree

71.

A 5V battery, resistances of 10k ohms and 33k ohms are connected in series. Then resistance 22k ohms is connected in parallel to 33k ohms. How many nodes does the circuit have?

a)

2 nodes

b)

3 nodes

c)

4 nodes

d)

6 nodes

72.

A 5V battery, resistances of 10k ohms and 33k ohms are connected in series. Then resistance 22k ohms is connected in parallel to 33k ohms. How many loops does the circuit have?

a)

2 loops

b)

3 loops

c)

4 loops

d)

6 loops

73.

A 5V battery, resistances of 2.2k ohms and 2.7k ohms are connected in series. Then resistance of 3.3k ohms is connected in parallel to 2.2k ohms. Another current source of 3A is added parallel to 3.3k ohms. How many nodes does the circuit have?

a)

2 nodes

b)

3 nodes

c)

4 nodes

d)

6 nodes

74.

A 5V battery, resistances of 2.2k ohms and 2.7k ohms are connected in series. Then resistance of 3.3k ohms is connected in parallel to 2.2k ohms. Another current source of 3A is added parallel to 3.3k ohms. How many loops does the circuit have?

a)

2 loops

b)

3 loops

c)

4 loops

d)

6 loops

75.

One complete variation of sine wave from zero to positive peak, back to zero, then negative peak and again back to zero is referred as:

a)

amplitude

b)

RMS

c)

cycle.

d)

period

76.

The time taken by the waveform to complete one full cycle is called the ___________ of the waveform.

a)

1kHz frequencty

b)

time petriod

c)

cycle.

d)

duration of wave

77.

The number of cycles per second is ___________.

a)

frequency

b)

time petriod

c)

cycle.

d)

duration of wave

78.

Amplitude is __________ of the Signal.

a)

Strength

b)

Frequency

c)

Time period

d)

None of the these

79.

A time taken by a signal to change from low value to high value is called ___________.

a)

wave length

b)

time period

c)

fall time

d)

rise time

80.

A time taken by a signal to change from high to low value is called _________.

a)

wave length

b)

time period

c)

fall time

d)

rise time

81.

One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. What is the phase angle between the two waveforms?

a)

0 degree

b)

45 degree

c)

40 degree

d)

135 degrees

82.

A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of __________.

a)

1.3MHz

b)

25kHz

c)

18kHz

d)

12kHz

83.

Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?

a)

Wave A lags wave B by 15°

b)

Wave A leads wave B by 15°

c)

Wave A leads wave B by 105°

d)

Wave A lags wave B by 105°

84.

A sine wave goes through 10 cycles in 20 μs. What is the period of the wave?

a)

2 μs

b)

4 μs

c)

20 μs

d)

100 μs

85.

The frequency of power supply in India is 50Hz. What is the time period of the waveform?

a)

50ms

b)

35ms

c)

20ms

d)

16.66ms

86.

The frequency of power supply in India is 50Hz. Assuming that the electrons travel very close to C (the speed of light), what is the wave length of the waveform?

a)

6000km

b)

50km

c)

5000km

d)

220km

87.

A sine wave has a frequency of 100 Hz. How many cycles will it go through in 12s?

a)

1/100 cycle

b)

12 cycles

c)

120 cycles

d)

1200 cycles

88.

What is the frequency of a signal with a 400 μs period?

a)

250Hz

b)

2500Hz

c)

25000Hz

d)

400Hz

89.

In AC the current and voltage change their direction with respect to _______.

a)

current

b)

time

c)

voltage

d)

Refrequency

90.

Motors convert______________ energy into mechanical energy.

a)

displacement

b)

pressure

c)

electrical

d)

light

91.

Which of the following appliances do not work with AC?

a)

Washing machine

b)

Grinding machine

c)

Water heater

d)

Laser pointer

92.

AC waveform consists of ______________.

a)

No cycles

b)

Negative and positive half cycles

c)

Negative cycles

d)

increasing cycles

93.

What type of wave is a sine wave?

a)

continuous wave.

b)

discrete

c)

complex

d)

clipping wave

94.

A sinusoidal current has an rms value of 14 mA. What is the peak-to-peak current value?

a)

45.12 mA

b)

39.6 mA

c)

16 mA

d)

22.6 mA

95.

The rms current through a 4.7 kΩ resistor is 4 mA. What is the peak voltage drop across the resistor?

a)

4V

b)

18.8V

c)

26.6V

d)

2.66V

96.

The rms voltage drop across a 15 kΩ resistor is 16 V. What is the peak current through the resistor?

a)

15mA

b)

10mA

c)

5mA

d)

1.5mA

97.

Two series resistors are connected to an ac source. There is 7.5 V rms voltage drop across one resistor and 4.2 V rms across the other. What is the peak source voltage?

a)

16.54V

b)

1.65V

c)

10.60V

d)

5.93V

98.

What is the minimum number of wires used to connect single phase power supply?

a)

4 wires

b)

2 wires

c)

3 wires

d)

1 wire

99.

Which of the following is true for a single phase power supply?

a)

Only current has sine wave

b)

Only voltage has sine wave

c)

Current and voltage have sine wave

d)

current and voltage are constant

100.

What is the Power Factor of DC

a)

1

b)

Between 0 & 1

c)

more than 1

d)

less than 0

101.

What is the Power Factor of AC

a)

1

b)

Between 0 & 1

c)

more than 1

d)

less than 0

102.

The ratio between the active power and apparent power is called power factor. Power factor can also be defined as _________.

a)

Cosine of angle between current and voltage of an Ac circuit

b)

Sine of angle between current and voltage of an Ac circuit

c)

sum of current and voltage of an Ac circuit

d)

product of current and voltage of an Ac circuit

103.

Low power factor has a drawback of __________.

a)

Increased transmission and distribution losses

b)

Poor voltage regulation

c)

High cost of equipment for given load

d)

All of these

104.

The power which is actually consumed or utilized in an AC Circuit is called ----------------

a)

True power

b)

Reactive Power

c)

Apparent Power

d)

power

105.

The product of applied voltage and active component of the current.

a)

True power

b)

Reactive Power

c)

Apparent Power

d)

power

106.

The product of applied voltage and the reactive component of the current.

a)

True power

b)

Reactive Power

c)

Apparent Power

d)

power

107.

The product of R.M.S value of voltage (V) and current (I).

a)

True power

b)

Reactive Power

c)

Apparent Power

d)

power

108.

What will be the power when Current and Voltage are 90 Degree Out of Phase?

a)

Minimum

b)

Maximum

c)

Infinite

d)

zero.

109.

What will be the power in a pure capacitive circuit?

a)

Minimum

b)

Maximum

c)

Infinite

d)

zero.

110.

What will be the power in a pure inductive circuit?

a)

Minimum

b)

Maximum

c)

Infinite

d)

zero.

111.

The primary reason for low power factor is owing to installation of __________

a)

Synchronous motor

b)

DC motor

c)

Induction motor

d)

Commutator motor

112.

Medium size induction motor will operate at maximum power factor while operating at ________

a)

Full load

b)

50% of full load

c)

25% of full load

d)

Any load

113.

Medium size induction motor will operate at lowest power factor while operating at ________

a)

high load

b)

low load

c)

overload

d)

Any load

114.

An alternator is supplying a load of 300kW at 0.6 p.f lagging. What is the apparent power supplied by the alternator?

a)

200kVA

b)

180kVA

c)

500kVA

d)

300kVA

115.

An alternator is supplying a load of 300kW at 0.6 p.f lagging. If the p.f. is raised to unity, then how many more kilowatts of power can the alternator supply for the same kVA loading?

a)

200kVA

b)

180kVA

c)

500kVA

d)

300kVA

116.

In order to improve the power factor which device should be connected to the power system?

a)

Series capacitor

b)

Series inductor

c)

Shunt capacitor

d)

Shunt inductor

117.

A motor has a rating of 169.71VA. The wattmeter shows power consumption of 119.9w. What is the PF of the motor?

a)

1

b)

0.76

c)

0.9

d)

0.71

118.

The resistive load obstructs the flow of electrical energy in the circuit and converts it into _________ energy.

a)

light

b)

thermal

c)

inductive

d)

chemical

119.

What type of load are the lamp and the heater?

a)

resistive

b)

inductive

c)

capacitive

d)

none of these

120.

What is the power factor of a resistive load?

a)

0

b)

1

c)

0.5

d)

0.8

121.

Generators are the examples of what type of load?

a)

resistive

b)

inductive

c)

capacitive

d)

none of these

122.

In case of leading P.F, what is leading?

a)

power

b)

voltage

c)

current

d)

in phase

123.

In case of lagging P.F, what is lagging?

a)

power

b)

voltage

c)

current

d)

in phase

124.

Motor offers inductive load due to coils. If motor is connected as load, then what is true?

a)

voltage lags

b)

current lags

c)

current leads

d)

both are in phase

125.

Battery offers capacitive load due to storage plates. In a battery charging plant, what is true?

a)

voltage leads

b)

current lags

c)

current leads

d)

both are in phase

126.

The power factor of the inductive load is ____________

a)

lagging

b)

leading

c)

unity

d)

no change

127.

The power factor of the capacitive load is _____________

a)

lagging

b)

leading

c)

unity

d)

no change

128.

In the pure capacitive circuit, the current always _______ the voltage.

a)

180 degree lags

b)

180 degree leads

c)

90 degree lags

d)

90 degree leads

129.

The power factor of the inductive load is lagging. How can this power factor be improved?

a)

Static capacitors

b)

Synchronous condenser

c)

Phase advancer

d)

All of these

130.

For a consumer what is the most economical power factor?

a)

0.25 to 0.5 lagging

b)

0.25 to 0.5 leading

c)

0.85 to 0.95 lagging

d)

0.85 to 0.95 leading

131.

What is the most suitable location of a power factor improvement device?

a)

Near the electrical appliances which is responsible for poor power factor

b)

At the receiving end in case of transmission line

c)

At the sending end

d)

Both (a) and (b)

132.

How many wires does a three phase system consist of?

a)

2 or 3

b)

2 wires

c)

3 or 4 wires

d)

more than 5

133.

What type of connection is used for long distance transmission?

a)

star

b)

delta

c)

DC

d)

single phase

134.

What is the phase difference between the phases of 3-phase supply system?

a)

0 degree

b)

90 degrees

c)

120 degrees

d)

180 degrees

135.

What is the sum of all the voltages In a three phase AC circuit?

a)

Infinite (∞) V

b)

0V

c)

1 V

d)

240V

136.

The kilowatt-hour is the unit of _________.

a)

electrical charge

b)

electrical power

c)

electrical energy

d)

voltage

137.

It costs Rs. 10 for 1 kWh of electrical energy. How much will it cost to run a 60 W lamp for 10 hours?

a)

Rs. 10

b)

Rs. 6.60

c)

Rs. 0.6

d)

Rs. 6

138.

An electric rice cooker rated 800W, 230V is switched on for 30 minutes. How much electrical energy is used?

a)

400kWh

b)

0.4kWh

c)

3.48kWh

d)

104kWh