013/2023 - Sub Engineer (Electrical)

Question 1

Which of the following statements are TRUE about the resistance of a material?
(i) Resistance varies directly as its area of cross section
(ii) Resistance varies inversely as the length of the material
(iii) Resistance does not depend on the nature of the material
(iv) Resistance depends on the temperature of the material

Accepted Answer

(iv) only

Answer

Both (i) and (iv)

Answer

Both (ii) and (iii)

Answer

Both (i) and (ii)

Question 2

Which of the following is NOT a good conductor of electricity?

Accepted Answer

Pure mineral oil

Answer

Acids

Answer

Sea water

Answer

Gold

Question 3

The SI unit of Electrical Conductivity is:

Accepted Answer

Siemens per meter

Answer

Siemens per square meter

Answer

Ohm per meter

Answer

Ohm-meter

Question 4

Two wires A and B have the same cross section and are made of the same material. Resistance of A is 600 Ω and Resistance of B is 200Ω . The number of times of A is longer than B is:

Accepted Answer

3

Answer

2

Answer

0.33

Answer

6

Question 5

If two identical 4A, 2Ω Norton equivalent circuits are connected in parallel with like polarity to like, the combined Norton equivalent circuit is:

Accepted Answer

8A, 1Ω

Answer

8A, 4Ω

Answer

0A, 1Ω

Answer

4A, 4Ω

Question 6

The Superposition theorem is essentially based on the concept of:

Accepted Answer

Linearity

Answer

Duality

Answer

Reciprocity

Answer

Non-linearity

Question 7

One Kilowatt hour of electrical energy equals:

Accepted Answer

860 Kilo-calorie

Answer

3600 Joules

Answer

735.5 Watts

Answer

4186 Joules

Question 8

Two similar electric charges of 1 Coulomb each are placed 1 meter apart in air. Force of repulsion between them would be nearly:

Accepted Answer

9 × 10⁹ N

Answer

1 N

Answer

0 N

Answer

8.85 x 10⁻¹² N

Question 9

If a dielectric slab of thickness 6 mm and 5 εᵣ = is inserted between the plates of an air capacitor with plate separation of 8 mm, it’s capacitance is :

Accepted Answer

Increased

Answer

Decreased

Answer

Almost halved

Answer

Unaffected

Question 10

A capacitor that stores a charge of 0.2 Coulombs at 10 volts has a capacitance of:

Accepted Answer

0.02 Farad

Answer

2 Farad

Answer

50 Farad

Answer

10 Farad

Question 11

Permeability in a magnetic circuit corresponds to ———————— in an Electric Circuit.

Accepted Answer

Conductivity

Answer

Reluctivity

Answer

Resistivity

Answer

Susceptibility

Question 12

The lifting power of an electromagnet depends on:

Accepted Answer

Both A) and B)

Answer

Pole area of electromagnet

Answer

Magnetic flux density

Answer

Shape of electromagnet

Question 13

Which of the following instruments are equally accurate on dc as well as ac circuits?

Accepted Answer

Dynamometer wattmeter

Answer

Moving iron ammeter

Answer

Induction wattmeter

Answer

PMMC voltmeter

Question 14

Induction watt hour meters are free from:

Accepted Answer

Frequency error

Answer

Phase error

Answer

Creeping error

Answer

Temperature error

Question 15

The RMS value of a half wave rectified current is 5A, it’s value for full wave rectification would be:

Accepted Answer

10/√2 A

Answer

10/2 A

Answer

10/π A

Answer

20/π A

Challenge Yourself

Practice Mode

Mock Test

013/2023 - Sub Engineer (Electrical)