Basic Electrical Engineering MCQs Part 31

Contents

- 1 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
- 2 An electric kettle is marked 2000 W, 200 V. The resistance of coil is
- 3 Charge on one electron is
- 4 Which of following is a scalar quantity
- 5 The rated voltage of 3-phase power system is expressed as

## 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 C
- 5 C
- 10 C
- 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:

- 0.2 Ω
- 20 Ω
- 200 Ω
- 400 Ω

Correct answer: 2. 20 Ω

Formula:

P = V^{2}/R or R = V^{2}/P

R = (200)^{2}/2000 = 20 Ω

## Charge on one electron is

Charge on one electron is:

- 1.602 * 10
^{-19} - 1.592 * 10
^{-39} - 1.295 * 10
^{-12} - 1.874 * 10
^{-3}

Correct answer: 1. 1.602 * 10^{-19}

Explanation: Coulomb is defined as the charge carried by 6.24 * 10^{18} electrons.

Writing in the form of equation:

1 C = 6.24 * 10^{18} electrons

Or 1 electron = 1C/6.24 * 10^{18} = 1.602 * 10^{-19} C

## Which of following is a scalar quantity

Which of following is a scalar quantity:

- Electrical field
- Electric potential
- Electric displacement density
- Electric Force
- 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:

- RMS line to line voltage
- RMS phase voltage
- Peak phase voltage
- Peak line to line voltage

Correct answer: 1. RMS line to line voltage

Also see Electrical Engineering MCQs on:

- Basic Electrical Laws and Theorems
- Basic Voltage and Current MCQs
- High Voltage Engineering MCQs
- Induction Motor MCQs
- Power Electronics
- Power Distribution MCQs
- Power Generation MCQs
- Power System Protection MCQs
- Power Transmission and Distribution MCQs
- Synchronous Generator MCQs
- Synchronous motor MCQs
- Transformer MCQs