EEE : Energy and Power MCQs with Answers

1 .
A 220 Ω resistor dissipates 3 W. The voltage is
A)  2.5 V
B)  25.7 V
C)  73.3 V
D)  257 V

Correct Answer :   25.7 V

2 .
If you used 400 W of power for 30 h, you have used
A)  1.2 kWh
B)  1.3 kWh
C)  12 kWh
D)  13.3 kWh

Correct Answer :   12 kWh

3 .
A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?
A)  1 h
A)  
B)  10 h
B)  
C)  200 h
C)  
D)  2,000 h
D)  

Correct Answer :   2,000 h

4 .
The capacity of a battery is measured in milli-amperes.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   False

5 .
A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?
A)  0.938 Wh
B)  5.6 Wh
C)  56.25 Wh
D)  938 Wh

Correct Answer :   0.938 Wh

6 .
In 0.025 W, there are
A)  25 kW
B)  25 mW
C)  0.00025 mW
D)  2,500 µW

Correct Answer :   25 mW

7 .
Three hundred joules of energy are consumed in 15 s. The power is
A)  2 W
B)  20 W
C)  200 W
D)  2,000 W

Correct Answer :   20 W

8 .
A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is
A)  13.2 mW
A)  
B)  22.6 mW
B)  
C)  132 mW
C)  
D)  226 mW
D)  

Correct Answer :   132 mW

9 .
The watt is the unit of power.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   True

10 .
A resistor normally opens when it burns out.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   True

11 .
The power rating of a resistor determines the minimum power that it can handle safely.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   False

12 .
For 12 V and 40 mA, the power is
A)  0.480 W
B)  480 mW
C)  480,000 µW
D)  All of the above

Correct Answer :   All of the above

13 .
How many watt-hours represent 65 W used for 18 h?
A)  11.7 Wh
B)  1,170 Wh
C)  11,700 Wh
D)  117,000 Wh

Correct Answer :   1,170 Wh

14 .
Energy equals power multiplied by time.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   True

15 .
If it takes 400 ms to use 12,000 J of energy, the power is
A)  3 W
B)  30 W
C)  30 kW
D)  300 kW

Correct Answer :   30 kW

16 .
A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least
A)  4.8 W
B)  15 mW
C)  150 mW
D)  480 mW

Correct Answer :   150 mW

17 .
A half-watt is equal to how many milliwatts?
A)  5,000 mW
B)  500 mW
C)  50 mW
D)  5 mW

Correct Answer :   500 mW

18 .
A 33 Ω half-watt resistor and a 330 Ω half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
A)  33 Ω
A)  
B)  330 Ω
B)  
C)  Both resistors
C)  
D)  Neither resistor
D)  

Correct Answer :   Neither resistor

19 .
A battery is one type of power supply that converts chemical energy into electrical energy.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   True

20 .
When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
A)  Open
B)  Shorted
C)  Reversed
D)  Overheated

Correct Answer :   Shorted

21 .
The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
A)  0.5 W
B)  1 W
C)  2 W
D)  5 W

Correct Answer :   2 W

22 .
Power rating is related to resistance value.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   False

23 .
Watt's law states the relationships of power to energy.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   False

24 .
A 3.3 kΩ resistor dissipates 0.25 W. The current is
A)  8.7 A
B)  8.7 µA
C)  87 mA
D)  8.7 mA

Correct Answer :   8.7 mA

25 .
In 40 kW, there are
A)  0.4 mW
B)  400 W
C)  5,000 W
D)  40,000 W

Correct Answer :   40,000 W

26 .
The joule is a unit of energy.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   True

27 .
Energy is equal to power multiplied by voltage.
A)  True
B)  False
C)  Can Not Say
D)  None of the above

Correct Answer :   False

28 .
A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately
A)  1.2 V
B)  6 V
C)  12 V
D)  120 V

Correct Answer :   12 V

29 .
A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?
A)  2.01 kWh
A)  
B)  8.4 kWh
B)  
C)  20.16 kWh
C)  
D)  201.6 kWh
D)  

Correct Answer :   201.6 kWh

30 .
A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is
A)  4.28 %
B)  8.57 %
C)  42.85 %
D)  85.7 %

Correct Answer :   85.7 %

31 .
How much continuous current can be drawn from a 60 Ah battery for 14 h?
A)  4.2 A
B)  4.28 A
C)  42.8 A
D)  428 A

Correct Answer :   4.28 A

32 .
At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?
A)  1.286 kWh
B)  12.85 kWh
C)  252 kWh
D)  535 kWh

Correct Answer :   1.286 kWh

33 .
A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is
A)  0.58 Ah
B)  2.1 Ah
C)  21 Ah
D)  58 Ah

Correct Answer :   21 Ah

34 .
When the current through a 12 kΩ resistor is 8 mA, the power is
A)  7.68 W
B)  7.68 mW
C)  76.8 W
D)  768 mW

Correct Answer :   768 mW

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