Transformer

Q.

Imagine if the current in the primary coil of a transformer becomes steady, then what happens to magnetic field?

1. It becomes infinity.

2. It gets halved.

3. It becomes zero.

4. It becomes constant.

Q. Calculate the load current and load voltage in the following transformer circuit. Soyrce : 30v AC, Np = 100, Ns =100, Rs =100 Ω

1. 5V, 0.35 A
2. 10V, 0.7 A
3. 6V, 0.3 A
4. 12V, 0.6 A

Q.

In a transformer, the number of turns in the primary coil are 140 and that in the secondary coil are 280. If the current in primary coil is 4 A, then the current in the secondary coil is:

1. 4 A

2. 2 A

3. 10 A

4. 6 A

Q.

The primary and secondary windings of a transformer are ____

1. inductively linked.

2. conductively linked.

3. not linked at all.

4. physically linked.

Q.

A microphone is a device that transforms an alternating voltage from one value to another value.

1. True

2. False

Q.

Transformers are used in ____.

1. DC Circuits

2. DC Motors

3. AC Circuits

4. Both AC and DC circuits

Q. Transformers are used to convert high voltages to the low voltages only.

1. True
2. False

Q. Transmitting electricity at high voltages over long distances reduces the energy loss due to the joule heating.

1. True
2. False

Q. Which amongst these is not an electrical safety device?

1. MCB
2. Main fuse
3. Transformer
4. ELCB

Q. Which of them is not designed to break the circuit?

1. Switch
2. M.C.B
3. Transformer
4. Fuse