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Essential Energy Engineering Interview Questions & Answers:

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1. A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is

A. 132 mW
B. 13.2 mW
C. 22.6 mW
D. 226 mW

Option A

2. When the current through a 12 k resistor is 8 mA, the power is

A. 7.68 mW
B. 768 mW
C. 7.68 W
D. 76.8 W

Option B

3. A 75 load uses 2 W of power. The output voltage of the power supply is approximately

A. 120 V
B. 1.2 V
C. 12 V
D. 6 V

Option C

4. How much continuous current can be drawn from a 60 Ah battery for 14 h?

A. 42.8 A
B. 428 A
C. 4.28 A
D. 4.2 A

Option C

5. The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be

A. 2 W
B. 1 W
C. 5 W
D. 0.5 W

Option A

6. Three hundred joules of energy are consumed in 15 s. The power is

A. 2,000 W
B. 2 W
C. 20 W
D. 200 W

Option C

7. A half-watt is equal to how many milliwatts?

A. 5,000 mW
B. 5 mW
C. 500 mW
D. 50 mW

Option C

8. A 3.3 k resistor dissipates 0.25 W. The current is

A. 8.7 mA
B. 87 mA
C. 8.7 µA
D. 8.7 A

Option A
Explanation:
W = I2R

I = square root(W/R)

= square root( 0.25/(3.3x1000) )

= 0.0087038828

= 8.7 mA

9. A 220 resistor dissipates 3 W. The voltage is

A. 73.3 V
B. 2.5 V
C. 25.7 V
D. 257 V

Option C

10. For 12 V and 40 mA, the power is

A. 480 mW
B. 0.480 W
C. 480,000 µW
D. all of the above

Option D

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