Basic Electrical Engineering MCQs Part 31

Basic Electrical Engineering MCQs Part 31

The quantity of charge that needs to be delivered by a battery having potential difference of 12 V for doing a work of 240 J

The quantity of charge that needs to be delivered by a battery having potential difference of 12 V for doing a work of 240 J:

1. 1 C
2. 5 C
3. 10 C
4. 20 C

Correct answer: 4. 20 C

Explanation

Q = W/V = 240 / 12 = 20 C

An electric kettle is marked 2000 W, 200 V. The resistance of coil is

An electric kettle is marked 2000 W, 200 V. The resistance of coil is:

1. 0.2 Ω
2. 20 Ω
3. 200 Ω
4. 400 Ω

Correct answer: 2. 20 Ω

Formula:

P = V²/R or R = V²/P

R = (200)²/2000 = 20 Ω

Charge on one electron is

Charge on one electron is:

1. 1.602 * 10^-19
2. 1.592 * 10^-39
3. 1.295 * 10^-12
4. 1.874 * 10^-3

Correct answer: 1. 1.602 * 10^-19

Explanation: Coulomb is defined as the charge carried by 6.24 * 10¹⁸ electrons.

Writing in the form of equation:

1 C = 6.24 * 10¹⁸  electrons

Or 1 electron = 1C/6.24 * 10¹⁸   = 1.602 * 10^-19 C

Which of following is a scalar quantity

Which of following is a scalar quantity:

1. Electrical field
2. Electric potential
3. Electric displacement density
4. Electric Force
5. All of these

Correct answer: 2. Electric potential

The rated voltage of 3-phase power system is expressed as

The rated voltage of 3-phase power system is expressed as:

1. RMS line to line voltage
2. RMS phase voltage
3. Peak phase voltage
4. Peak line to line voltage

Correct answer: 1. RMS line to line voltage

Also see Electrical Engineering MCQs on:

1. Basic Electrical Laws and Theorems
2. Basic Voltage and Current MCQs
3. High Voltage Engineering MCQs
4. Induction Motor MCQs
5. Power Electronics
6. Power Distribution MCQs
7. Power Generation MCQs
8. Power System Protection MCQs
9. Power Transmission and Distribution MCQs
10. Synchronous Generator MCQs
11. Synchronous motor MCQs
12. Transformer MCQs