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Prof.Afroz.BASIC ELECTRICAL ENGINEERING 21elel23

Total questions: 40

Worksheet time: 26mins

Name
Class
Date
1.

Electric pressure is also called

a)

Resistance

b)

Power

c)

Voltage

d)

Energy

2.

The sum of all the voltages over any closed loop is equal to

a)

1V

b)

0V

c)

infinity

d)

Supply voltage

3.

What is the basic law used to analyze any circuit

a)

Kirchhoff's laws

b)

Amperes's law

c)

Faraday's law

d)

Newton's law

4.

Maximum power is transferred from the source to the load end when the _____ of the circuit matches with the load impedance

a)

Impedance

b)

capacitance

c)

admittance

d)

power

5.

Which quantity consists of a unit 1KWh ?

a)

Energy

b)

Time

c)

Power

d)

charge

6.

Rms value is defined based on which of the following?

a)

Heating effect

b)

Charge transfer

c)

Current

d)

Voltage

7.

Voltage drop across 14.5 Ω resistor in figure

a)

29 V

b)

30.5 V

c)

14 V

d)

18 V

8.

Voltage drop across 14.5 Ω resistor in figure

a)

29 V

b)

30.5 V

c)

14 V

d)

18 V

9.

Voltage drop across 14.5 Ω resistor in figure

a)

29 V

b)

30.5 V

c)

14 V

d)

18 V

10.

The voltage across the parallel circuit shown in figure is

a)

15 V

b)

10 V

c)

30 V

d)

12.5 V

11.

The current in 10Ω resistor in figure is

a)

3 A

b)

2.5 A

c)

1.5 A

d)

3.5 A

12.

the resistance of the conductor increases when

a)

its length increases

b)

its area increases

c)

both of above

d)

its resistivity kept constant

13.

What

single resistor is equivalent to the three resistor 1k,5k,2k are in parallel

a)

170k

b)

17k

c)

1.7k

d)

170ohm

e)

1.7ohm

14.

What

single resistor is equivalent to the three resistor 1k,5k,2k are in parallel

a)

170k

b)

17k

c)

1.7k

d)

170ohm

e)

1.7ohm

15.

The efficiency of a transformer will be maximum when ?

a)

copper losses = hysteresis losses

b)

hysteresis losses = eddy current losses

c)

eddy current losses = copper losses

d)

copper losses = iron losses

16.

Which of the following does not change in an ordinary transformer ?

a)

Current

b)

Voltage

c)

Frequency

d)

Any of the above

17.

The induced EMF in the armature conductors of a DC motor is

a)

Triangular

b)

Alternating

c)

Rectangular

d)

Trapezoidal

18.

By using two wattmeter method, power can be measured in

a)

3 - phase, 2 - wire system

b)

3 - phase, 3 - wire system

c)

3 - phase, 4 - wire system

d)

All of these

19.

The earth electrode is made up of

a)

steel

b)

galvanized iron

c)

bronze

d)

lead

20.

A DC machine works on the basic principles of

a)

Len’s Law

b)

Ohm’s Law

c)

Faraday’s Law

d)

None

21.

KCL deals with the conservation of:

a)

Momentum

b)

Mass

c)

Potential Energy

d)

Charge

22.

Which of the following is not a type of energy source?

a)

generator

b)

solar cell

c)

rheostat

d)

battery

23.

Which of the following is true of electrical forces?

a)

Like charges attract, unlike charges repel.

b)

Electrical forces are produced by electrical charges.

c)

Positive and negative charges can combine to produce the third type

d)

Electrical forces are weaker than gravitational forces.

24.

In the figure shown, which of the following is the neutral side?

a)

Smaller notch, right side

b)

Larger notch, left side

c)

buttom notch

d)

None of the Above

25.

What is this?

a)

Transformer

b)

Switchgear

c)

Isolator

26.

What is this?

a)

Transformer

b)

Switchgear

c)

Isolator

27.

What is this?

a)

Switchgear

b)

Generator

c)

UPS

28.

What is this?

a)

Switchboard

b)

Distribution Board

c)

Circuit Breaker

29.

What is this?

a)

Switchboard

b)

Distribution Board

c)

Circuit Breaker

30.

This is used to increase or decrease the alternating voltages in electric power applications.

a)

Transformer

b)

HV Switchgear

c)

LV Switchgear

31.

one coulomb of charge is equal to the charge on

a)

625×1016 electrons625\times10^{16}\ electrons

b)

6.25×1016 electrons6.25\times10^{16}\ electrons

c)

62.5×1016 electrons62.5\times10^{16}\ electrons

d)

0.625×1016 electrons0.625\times10^{16}\ electrons

32.

Which one of the following is the best conductor of electricity ?

a)

silver

b)

gold

c)

copper

d)

zinc

33.

The unit of resistivity is

a)

Ω.

b)

Ω - metre.

c)

Ω / metre.

d)

Ω / m².

34.
If the hair dryer and the vacuum cleaner are both on, what is the power used?
a)
2600 watts
b)
400 watts
c)
2200 watts
d)
1100 watts
35.
Electrical power can be calculated using
a)
Resistance x Voltage
b)
Voltage x Current 
c)
Voltage ÷ Current
36.
The power of an appliance is...
a)
the amount of voltage going through it 
b)
the amount of energy transferred per second
c)
the amount of charge that passes through per second
37.
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
a)
170 W
b)
170 A
c)
1.7 V
d)
1.7 W
38.

What is the unit of Electrical Power?

a)

Joule

b)

Watt

c)

Where

d)

Amp

39.

A kilowatt (kW) is how many watts?

a)

10

b)

50

c)

100

d)

1000

40.

Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps

a)

300 volts

b)

30 volts

c)

12 volts

d)

0.08 volts

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