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Energy And Power MCQ Questions & Answers | Electrical Engineering

Learn Energy And Power MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Energy And Power MCQ question is the important chapter for a Electrical Engineering and GATE students. Page-3 section-1

21
In 0.025 W, there are
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Answer & Solution
Answer: Option D
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22
Three hundred joules of energy are consumed in 15 s. The power is
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Answer: Option C
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23
A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is
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Answer: Option A
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24
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?
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Answer & Solution
Answer: Option D
Solution:
To determine which resistor will overheat, we need to calculate the power dissipated in each resistor and compare it with their power rating (0.5 watts).

Using the power formula: P = V² / R

For the 33 Ω resistor:
P = (12)² / 33 = 144 / 33 ≈ 4.36 watts
This is much greater than 0.5 watts, so the 33 Ω resistor will overheat.

For the 330 Ω resistor:
P = (12)² / 330 = 144 / 330 ≈ 0.436 watts
This is less than 0.5 watts, so the 330 Ω resistor will NOT overheat.

Conclusion: Only the 33 Ω resistor will overheat.
25
A battery is one type of power supply that converts chemical energy into electrical energy.
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Answer & Solution
Answer: Option A
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26
When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
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Answer: Option B
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27
The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
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Answer: Option A
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28
A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately
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Answer: Option C
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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?
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Answer: Option B
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30
When the current through a 12 kΩ resistor is 8 mA, the power is
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Answer: Option B
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