Inductors MCQs

Question 1

With 100 Vac applied to the primary of a transformer so that it draws 500 mA, what will be the 300 Vac secondary current?

Accepted Answer

167 mA

Answer

1500 mA

Answer

200 mA

Answer

150 mA

Question 2

Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?

Accepted Answer

coil 2

Answer

The coil windings must be the same.

Answer

coil 1

Answer

The coil ratio is too small.

Question 3

When the transformer secondary is not loaded:

Accepted Answer

no secondary current flows

Answer

secondary voltage increases

Answer

no secondary voltage is present

Answer

secondary current increases

Question 4

What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 omega.gif, and the inductor is rated at 24 mH?

Accepted Answer

173.0 mA

Answer

79.9 mA

Answer

126.4 mA

Answer

198.6 mA

Question 5

What is the total inductance of a 5 H and a 100 mH coil connected in parallel?

Accepted Answer

98.0 mH

Answer

4.76 mH

Answer

33.3 mH

Answer

150.0 mH

Question 6

A transformer is used:

Accepted Answer

to couple electric energy from one ac circuit to another

Answer

to couple electric energy from one dc circuit to another

Answer

to couple electric energy from an ac circuit to a dc circuit

Answer

to couple electric energy from a dc circuit to an ac circuit

Question 7

Which of the following is NOT one of the three major types of fixed inductor?

Accepted Answer

magnesium core

Answer

air core

Answer

ferrite core

Answer

iron core

Question 8

What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?

Accepted Answer

1414 ohms

Answer

500 ohms

Answer

1000 ohms

Answer

2000 ohms

Question 9

What is remanence?

Accepted Answer

retentitivity

Answer

reactance

Answer

reluctance

Answer

resistance