Basic Electrical Engineering MCQs Part 1

Basic Electrical Engineering MCQs Part 1

No current flows between two charged bodies when they have same

No current flows between two charged bodies when they have same

1. Charge
2. Capacity
3. Potential
4. None of the above

Correct answer: 3. Potential

Electric current is due to the flow of

Electric current is due to the flow of

1. Positive charges only
2. Negative charges only
3. Both of above
4. Neutral particles only

Correct answer: 3. Both of above

One coulomb of charge equals to the charge on

One coulomb of charge equals to the charge on

1. 6.25 x 10^16 electrons
2. 62.5 x 10^16 electrons
3. 625 x 10^16 electrons
4. 0.625 x 10^16 electrons

Correct answer: 3. 625 x 10^16 electrons

Temperature coefficient of resistance for semi-conductors is

Temperature coefficient of resistance for semi-conductors is:

1. Zero
2. Positive
3. Negative
4. None of the above

Correct answer: 3. Negative

The resistance of a straight conductor depends on all of below mentioned with the exception of

The resistance of a straight conductor depends on all of below mentioned with the exception of:

1. Temperature
2. Shape of cross-section
3. Material
4. Cross-sectional area

Correct answer: 2. Shape of cross-section

The diameter of an atom is about

The diameter of an atom is about:

1. 10^-2 m
2. 10^-5 m
3. 10^-10 m
4. 10^-20 m

Correct answer: 3. 10^-10 m

The voltage drop across a 2 kW electric heater whose resistance when hot is 80 Ω

The voltage drop across a 2 kW electric heater whose resistance when hot is 80 Ω

1. 2 V
2. 20 V
3. 200 V
4. 400 V

Correct answer: 4. 400 V

Solution: V = SQRT(P* R) = 400 V

The mass of a proton is how many times the mass of electron

The mass of a proton is how many times the mass of electron

1. 1 time (is equal to)
2. 3 times less than
3. 400 times
4. About 1837 times

Correct answer: 4. About 1837 times

Which of following is an example of non-ohmic resistance

Which of following is an example of non-ohmic resistance:

1. Carbon resistance
2. Copper wire
3. Aluminum wire
4. Tungsten wire

Correct answer: 1. Carbon resistance

A substance having number of valence electrons more than 4 is usually

A substance having number of valence electrons more than 4 is usually:

1. An insulator
2. A semiconductor
3. A conductor
4. None of the above

Correct answer: 1. An insulator