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Fundamentals of Electrical Engineering

Total questions: 125

Worksheet time: 2hrs 47mins

Name
Class
Date
1.

Which of the following is a one-time protection device?

a)

RCCB

b)

MCB

c)

Fuse

d)

ELCB

2.

An RCCB trips when there is:

a)

Overcurrent

b)

Overvoltage

c)

Leakage current

d)

Reverse polarity

3.

What is the advantage of using MCB over fuse?

a)

Lower cost

b)

Resettable after fault

c)

Handles higher currents only

d)

Can detect voltage spikes

4.

Where would you most likely use a 30mA RCCB?

a)

Street lighting

b)

Residential wiring

c)

Industrial motor panel

d)

Solar panel

5.

Which fuse rating is most suitable for a 60W, 230V light bulb?

a)

0.1 A

b)

5 A

c)

1 A

d)

3 A

6.

Current drawn by a 1000W heater at 230V is:

a)

1.2 A

b)

4.35 A

c)

10 A

d)

0.23 A

7.

For what applications is a 100mA RCCB typically used?

a)

Residential circuits

b)

Medical ICU circuits

c)

Industrial equipment

d)

Laptop charging

8.

What is the approximate resistance of a bulb rated 250V, 100W?

a)

2.5 Ω

b)

100 Ω

c)

250 Ω

d)

625 Ω

9.

Power = Voltage × ______?

a)

Resistance

b)

Capacitance

c)

Current

d)

Conductance

10.

Which device cuts the circuit when the current exceeds a preset value?

a)

RCCB

b)

MCB

c)

Isolator

d)

ELCB

11.

MCB trips using which two types of mechanisms?

a)

Thermal and magnetic

b)

Resistive and inductive

c)

Electrical and optical

d)

Thermal and chemical

12.

RCCB compares currents in:

a)

Phase and ground wire

b)

Phase and neutral wires

c)

Phase wire and reference

d)

Neutral and ground wires

13.

A fuse is placed in:

a)

Neutral wire

b)

Phase wire

c)

Earth wire

d)

Across phase and neutral

14.

Which of the following devices will NOT trip in case of an electric shock through a wet body?

a)

RCCB

b)

ELCB

c)

MCB

d)

Fuse

15.

If the load draws 5A but the fuse is rated at 3A, what will happen?

a)

The fuse will allow 5A current to pass normally

b)

The fuse will blow, interrupting the circuit

c)

The fuse will regulate the current to 3A

d)

Fuse increases voltage to deliver more current

16.

WHAT IS RESPONSIBLE FOR THE CURRENT TO FLOW?

a)

PROTONS

b)

ELECTRONS

c)

NUCLEUS

d)

BOTH A & B

17.

INPUT POWER = OUTPUT POWER IS CALLED AS_____TRANSFORMER

a)

PRIMARY

b)

SECONDARY

c)

IDEAL

d)

NONE

18.

what is the unit of current

a)

ampere

b)

volt

c)

ohm

19.

ohm's law states that

a)

V=I/R

b)

I=V/R

c)

R=VI

20.

An instrument which detects electric current is known as

a)

AMMETER

b)

   Rheostat

   

c)

Voltmeter

   

21.

The filament of an electric bulb is made of

a)

 A. Carbon

   

b)

B. Aluminium

c)

   C. Tungsten

22.

The capacity of a battery is expressed in terms of

a)

   A. Current rating

   

b)

B. Voltage rating

 

c)

 C. Ampere hour rating

23.

UNIT OF QUANTITY OF CHARGE

a)

COULOMB

b)

OHM

c)

AMPERE

24.

THE POTENTIAL DIFFERENCE IS MEASURED

a)

AMMETER

b)

OHMMETER

c)

VOLTMETER

25.

THE RECIPROCAL OF TIMEPERIOD

a)

RESISTANCE

b)

FREQUENCY

c)

VOLTAGE

26.

WATT IS THE UNIT OF

a)

POWER

b)

VOLTAGE

c)

CURRENT

27.

The resistivity of the conductor depends on

a)

area of the conductor.

b)

length of the conductor.

c)

type of material.

d)

none of these.

28.

Which of the following is not an expression power?

a)

P=VI

b)

P=I2R

c)

P=V2/R

d)

P=I/R

29.

Conductance is expressed in terms of

a)

ohm / m

b)

m / ohm

c)

mho / m

d)

mho

30.

The S.I. unit of power is

a)

Henry

b)

Coulomb

c)

Watt

d)

Watt-hour

31.

The property of the conductor due to which it passes current is called

a)

Resistance

b)

Reluctance

c)

Conductance

d)

Inductance

32.

The insulation on a current carrying conductor is provided

a)

To prevent leakage of current

b)

To prevent a shock

c)

Both of the above

d)

None of the above

33.

Active power and apparent power are respectively represented by?

a)

kW and kVAR

b)

kVAR and kVA

c)

kVA and kVAR

d)

kW and kVA

34.
This is an example of a _______ circuit
a)
open
b)
series
c)
parallel
d)
square
35.
This is an example of a ______ circuit
a)
Series
b)
Parallel
c)
Open
d)
Dihexihedral
36.
The total resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
37.
The total current through this circuit is
a)
0.02 amps
b)
0.09 amps
c)
50 amps
d)
9 amps
38.
The voltage dropped across the 300 ohm resistor is 
a)
6 V
b)
9 V
c)
2 V
d)
30 V
39.
An ammeter is a device that can be used to measure
a)
Current
b)
Voltage
c)
Resistance
d)
Power
40.

When two batteries are connected in parallel, it should be ensured that

a)

They have same emf

b)

They have same make

c)

They have same ampere hour capacity

d)

They have identical internal resistance

41.
This circuit has more than one loop. When one light goes out, the others stay on. 
a)
closed circuit
b)
series circuit
c)
parallel circuit
d)
open circuit
42.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
43.
A series circuit has ____ path(s) that the electric current can take. 
a)
One
b)
Two 
c)
Three 
d)
Four
44.
What type of circuit is used in your house?
a)
Light Circuits
b)
The best circuits
c)
Series Circuits
d)
Parallel Circuits
45.
What is the type of circuit that stops working when one bulb goes out?
a)
A broken circuit
b)
Parallel Circuit
c)
Series Circuit
d)
A metal circuit
46.

The power factor of a purely resistive circuit is

a)

zero

b)

unity

c)

lagging

d)

leading

47.

Kirchhoff’s laws (KCL and KVL) are applicable to:

a)

DC circuits

b)

AC circuits

c)

Passive networks alone

d)

DC as well AC circuits

48.

A heater is rated at 230V, 10kW, AC. The 230V refers to

a)

average value

b)

r.m.s. voltage

c)

peak voltage

d)

none of the above

49.

For a frequency of 200Hz, the time period will be

a)

o.o5s

b)

0.005s

c)

0.0005s

d)

0.5s

50.
Electrical Energy 1 Unit=………..?
a)
1watt/1sec
b)
1kW/1hour
c)
1kW*1hour
d)
1watt*1hour
51.
Three resistances of 5Ω, 10Ω & 20Ω are connected in parallel. Find their equivalent resistance.
a)
20/7Ω
b)
7/20Ω
c)
5Ω
d)
20Ω
52.
Unit of reactive power is_______
a)
Watt
b)
V.A
c)
VAR
d)
NOTA
53.

UNIT OF RESISTANCE IS

a)

OHM

b)

MHO

c)

FARAD

d)

HENRY

54.

Which quantity consists of a unit 1KWh ?

a)

Energy

b)

Time

c)

Power

d)

charge

55.

Electrical appliances are connected in

parallel because it

a)

is a simple circuit

b)

draws less current

c)

results in reduced power loss

d)

makes the operation of appliances

independent of each other

56.

Voltage drop across 14.5 Ω resistor in figure

a)

29 V

b)

30.5 V

c)

14 V

d)

18 V

57.

Referring to the figure ,the total circuit resistance will be

a)

1000Ω

b)

400Ω

c)

1400Ω

d)

135Ω

58.

In figure

a)

the lamp A will be brighter than lamp B.

b)

the lamp B will be brighter than lamp A.

c)

the two lamps will be equally bright

d)

none of the above

59.

The voltage across the parallel circuit shown in figure is

a)

15 V

b)

10 V

c)

30 V

d)

12.5 V

60.

The current in 10Ω resistor in figure is

a)

3 A

b)

2.5 A

c)

1.5 A

d)

3.5 A

61.

The r.m.s. value of sinusoidal 100 V peak to peak is _________ volt.

a)

100√2

b)

50/√2

c)

50

d)

100

62.

The peak value of a sine wave is 200V.Its average value is

a)

127.4V

b)

141.4V

c)

282.8V

d)

200V

63.

Electric pressure is also called as

a)

resistance

b)

power

c)

voltage

d)

energy

64.

A closed switch has a resistance of

a)

zero

b)

about 50 ohms

c)

about 500 ohms

d)

infinity

65.

An electric filament bulb can be worked from

a)

D.C. supply only

b)

A.C. supply only

c)

Battery supply only

d)

All the above

66.

An EMF source of 8.0 V is connected to a purely resistive electrical appliance. An electric current of 2.0 A flows through it. What is the resistance offered by the electrical appliances?

a)

4 ohm

b)

6 ohm

c)

2 ohm

d)

3 ohm

67.

What are the steps in the electrical power system?

a)

Generation, transmission and distribution.

b)

generation, transmission and transformer

c)

generation, impedance and distribution.

d)

Motor, transmission and distribution.

68.

If an electrical appliance uses current of 11 A, which is the suitable value of fuse to be used.

a)

15 A

b)

5 A

c)

10 A

d)

13 A

69.

How many wires are used in three phase system?

a)

3

b)

4

c)

5

d)

all the above

70.

how can we select the thickness of fuse wire?

a)

based on load current

b)

based on voltage

c)

both

d)

none

71.

which material is generally used in conductor?

a)

plastic

b)

aluminium

c)

iron

d)

all the above

72.

Circuit protection devices are used for which of the following purposes?

a)

To protect people

b)

To protect circuits

c)

To guard against hazardous conditions

d)

All of the above

73.

Which of the following two are circuit protection devices?

a)

Electrical plugs and CO2 cartridges

b)

CO2 cartridges and circuit breakers

c)

Fuses and circuit breakers

d)

Fuses and electrical plugs

74.
Which of the following devices can supply backup power to a PC when the electricity fails and provides for line conditioning as well? 
a)
SPS
b)
UPS
c)
Line Conditioner
d)
Surge suppressor
75.

The figure shows ……………...

a)

timer

b)

contractor

c)

BUSH BUTTON

d)

MCCB

76.

The figure shows ……………...

a)

timer

b)

Circuit breaker ( MCB )

c)

selector switch

d)

Float switch

77.
Resistance in wire depends on how thick it is, how long it is and what it is made of.
a)
true
b)
false
78.
Your body is a conductor of electricity.
a)
true
b)
false
79.

The neutral wire carries the current...

a)

towards the appliance

b)

out of the appliance

80.

In a plug, the fuse is connected to the (a)   wire.

81.

When the current through a fuse gets too high, the wire inside the fuse will...

a)

create a spark

b)

melt

c)

sound an alarm

d)

do nothing

82.

Select the correct advantages of circuit breakers over fuses.

a)

Circuit breakers can be reset.

b)

Circuit breakers are cheaper.

c)

Circuit breakers stop the current faster.

83.

A connection that allows current to take the path of least resistance is a

a)

short circuit

b)

long circuit

c)

parallel circuit

d)

series circuit

84.

What is the term for a reusable safety switch that breaks the circuit when the current gets too high?

a)

third prong

b)

fuse

c)

circuit breaker

d)

short circuit

e)

grounded

85.

Without a fuse or circuit breaker, what might happen in a house with an overloaded electric circuit?

a)

the thin piece of metal would melt, breaking the circuit

b)

the metal band would heat up, disrupting the circuit

c)

a fire would start

d)

the electricity for the house would turn off

86.

What is the difference between a fuse and a circuit breaker?

a)

a fuse can only be used once and a circuit breaker is reusable

b)

a fuse is reusable and a circuit breaker can only be used once

c)

both fuses and circuit breakers can only be used once

d)

both fuses and circuit breakers are reusable

87.
Which factor determines the outcome of an electrical shock?
a)
The amount of current
b)
Which phase is involved
c)
The raceway system
d)
The size of the electrical equipment being used
88.

A bird perched on one electrical wire will not get shocked because there is no difference in electrical potential between its feet.

a)

true

b)

false

89.
What's the first thing you should do if someone is shocked electrically?
a)
Use the fire extinguisher
b)
Check for breathing and heartbeat
c)
Turn off the power source
d)
Remove the person from the power source
90.

Found in electrical devices and helps to stop too much current from damaging the device

a)

circuit

b)

current

c)

fuse

91.
It is unsafe for you to work with electricity when you are wet or standing in water.  
a)
True
b)
False
92.

What is the American Wire Gauge (AWG) system used for?

a)

Determining wire size

b)

Measuring electrical current

c)

Testing insulation strength

d)

Rating voltage capacity

93.

What does the wire gauge number indicate?

a)

The maximum current rating

b)

The type of insulation used

c)

The diameter of the wire

d)

The voltage capacity of the wire

94.

Why is it important to use the right size wire for the amount of current expected in a circuit?

a)

To improve energy efficiency

b)

To prevent voltage fluctuations

c)

To avoid excess heat and potential fires

d)

To reduce electrical resistance

95.

What is the potential danger of plugging a heater rated for 20 amps into a 15-amp circuit wired with 14-gauge wire?

a)

Voltage fluctuations

b)

Electrical resistance

c)

Energy inefficiency

d)

Excess heat and potential fires

96.

What should be considered when selecting the wire gauge for an extension cord?

a)

The voltage capacity of the cord

b)

The color of the cord

c)

The length of the cord

d)

The type of insulation used

97.

What is the purpose of the grounding path for extension cords?

a)

To keep users safe

b)

To prevent voltage fluctuations

c)

To avoid excess heat and potential fires

d)

To reduce electrical resistance

98.

A circuit breaker is

a)

power factor correcting device

b)

a device to neutralize the effect of transients

c)

a waveform correcting device

d)

a current interrupting device.

99.

A thermal protection switch provides protection against what?

a)

Overload

b)

Temperature.

c)

Short circuit.

d)

Overvoltage

100.

ELCB is an abbreviation of

a)

electrolytic circuit breaker

b)

earth locking circuit breaker

c)

earth leakage circuit breaker

d)

electric leakage circuit breake

101.

Short circuit occurs when the current takes up

a)

more voltage

b)

less voltage

c)

short path

d)

long path

102.

The function of the circuit breaker is

a)

To safeguard the circuit

b)

On and off the circuit

c)

To save human life

d)

None of these

103.
The difference in electrical potential energy between two charged bodies is called___
a)
Power
b)
Voltage
c)
current
d)
charge
104.
what type of current is it showing in picture?
a)
AC
b)
DC
c)
wire
d)
none
105.
what type of current is it showing in picture?
a)
AC
b)
DC
c)
wire
d)
none
106.
Current can only flow if there is a/an
a)
Open circuit
b)
Short circuit
c)
Parallel circuit
d)
Closed circuit
107.
____ source is shown in the picture.
a)
AC
b)
DC
c)
Both AC and DC
d)
None
108.

Resistors X and Y are connected in series with a 6.0 V battery of negligible internal resistance.


X has resistance R and Y has resistance R/2.


A voltmeter of resistance R is connected across Y.


What is the reading on the voltmeter?

a)

0.0 V

b)

1.5 V

c)

3.0 V

d)

4.5 V

109.

As you continue to add lightbulbs in series, what happens?

a)

The bulbs get brighter

b)

The bulbs get dimmer

c)

The bulbs remain the same brightness

d)

The bulbs explode and shards of glass get everywhere

110.

The voltage of the entire circuit is 18V. Lamp A, B and C are identical. What is the voltage of Lamp B?

a)

18V

b)

3V

c)

9V

d)

6V

111.

Which of the following is a good insulator?

a)

copper

b)

aluminum

c)

glass

d)

silver

112.

When a switch is _________, the electric current can flow through the circuit.

a)

open

b)

closed

113.

Which of the following is a good conductor?

a)

gold

b)

wood

c)

ceramic

d)

plastic

114.

If a switch is ______, a light bulb will not light.

a)

open

b)

closed

115.
Pick the correct sentence to describe this circuit.
a)
This circuit will work because it is a closed circuit.
b)
It is a complete series circuit.
c)
This circuit will not work because there is no energy source.
d)
This circuit will not work because there is no switch.
116.

Which of the following is a characteristic of variable tariff structures?

a)

Flat fees regardless of usage patterns.

b)

Fixed rates that do not change over time.

c)

Rates that are only based on geographical location.

d)

Rates that can change based on factors like time of use or demand.

117.

Time-of-Use tariffs are designed to encourage usage during which time?

a)

Peak hours

b)

Off-peak hours

c)

Midday hours

d)

Nighttime hours

118.

What is a demand charge in electricity billing?

a)

A demand charge is a flat fee for all electricity used.

b)

A demand charge is a fee based on the highest level of electricity demand during a billing period.

c)

A demand charge is a tax imposed by the government on electricity consumption.

d)

A demand charge is a discount applied to high electricity usage.

119.

How do peak rates differ from off-peak rates?

a)

Peak rates are lower than off-peak rates.

b)

Off-peak rates are the same as peak rates.

c)

Peak rates apply only during weekends.

d)

Peak rates are higher than off-peak rates.

120.

Which tariff structure typically has a constant rate regardless of usage?

a)

Tiered-rate tariff structure

b)

Variable-rate tariff structure

c)

Pay-as-you-go tariff structure

d)

Flat-rate tariff structure

121.

Demand charges are usually based on what measurement?

a)

The total energy consumption over a year measured in megawatt-hours (MWh).

b)

The highest level of electricity demand measured in kilowatts (kW).

c)

The minimum level of electricity demand recorded in kilowatts (kW).

d)

The average monthly electricity usage in kilowatt-hours (kWh).

122.

What is tariff?

a)

  1. The rate at Which electrical energy is produced in the plant.

b)

  1. The rate at Which electrical energy is supplied to the consumers.

c)

Both the answers are correct

123.

Calculate the number of units of electricity used if a bulb of 100 W is kept on for 5 hours.

a)

0.5 unit

b)

1 unit

c)

5 units

d)

105units

124.

Kabir bought 5 new light bulbs of 50 W each in addition to the 7 bulbs he already had in his house which were also 50 W each. Calculate his electricity bill, if he keeps the new bulbs on for 5 hours and the older bulbs on only for 3 hours, and the cost of one unit of electricity is Rs. 60.

a)

Rs. 138

b)

Rs. 130

c)

Rs. 139

d)

Rs. 140

125.

Find the energy in kWh consumed in 5 hours by five devices of power 200W each?

a)

5

b)

50

c)

10

d)

1

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