Energy Engineering Questions And Answers

1⟩ What is Energy Engineering?

Energy engineering is a broad field of engineering dealing with energy efficiency, energy services, facility management, plant engineering, environmental compliance and alternative energy technologies. Energy engineering is one of the more recent engineering disciplines to emerge.

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2⟩ Do you know how does energy engineering job benefit the environment?

It is a direct impact on the environment:

lower energy usage results in lower green house gases which positively impacts the environment. The benefit is very direct.

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3⟩ Do you know what energy systems engineers do?

► Manage operations of a wind turbine farm

► Analyze efficiency of hydro-electric power systems

► Oversee production of innovative fuel-cell technologies

► Evaluate the economic viability of new solar power installations

► Assess the environmental impact of alternative energy systems

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4⟩ 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

Option C

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

Option D

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6⟩ 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. 20.16 kWh B. 201.6 kWh C. 2.01 kWh D. 8.4 kWh

Option B

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

Option D

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8⟩ When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is A. overheated B. shorted C. open D. reversed

Option B

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9⟩ A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat? A. 33 B. 330 C. both resistors D. neither resistor

Option D

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10⟩ 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

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11⟩ 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

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12⟩ 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

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13⟩ 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

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14⟩ 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

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

Option C

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16⟩ 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

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17⟩ 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

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18⟩ 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

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19⟩ 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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20⟩ 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

Option B

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Energy Engineering

Home Engineering Energy Engineering

28 Energy Engineering Questions And Answers

1⟩ What is Energy Engineering?

2⟩ Do you know how does energy engineering job benefit the environment?

3⟩ Do you know what energy systems engineers do?

4⟩ 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

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

6⟩ 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. 20.16 kWh B. 201.6 kWh C. 2.01 kWh D. 8.4 kWh

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

8⟩ When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is A. overheated B. shorted C. open D. reversed

9⟩ A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat? A. 33 B. 330 C. both resistors D. neither resistor

10⟩ 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

11⟩ 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

12⟩ 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

13⟩ 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

14⟩ 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

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

16⟩ 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

17⟩ 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

18⟩ A 220 resistor dissipates 3 W. The voltage is A. 73.3 V B. 2.5 V C. 25.7 V D. 257 V

19⟩ 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

20⟩ 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

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Energy Engineering

Home Engineering Energy Engineering

28 Energy Engineering Questions And Answers

1⟩ What is Energy Engineering?

2⟩ Do you know how does energy engineering job benefit the environment?

3⟩ Do you know what energy systems engineers do?

4⟩ 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

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

6⟩ 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. 20.16 kWh B. 201.6 kWh C. 2.01 kWh D. 8.4 kWh

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

8⟩ When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is A. overheated B. shorted C. open D. reversed

9⟩ A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat? A. 33 B. 330 C. both resistors D. neither resistor

10⟩ 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

11⟩ 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

12⟩ 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

13⟩ 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

14⟩ 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

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

16⟩ 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

17⟩ 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

18⟩ A 220 resistor dissipates 3 W. The voltage is A. 73.3 V B. 2.5 V C. 25.7 V D. 257 V

19⟩ 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

20⟩ 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

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