Transformer MCQs Part 10
Contents
- 1 The temperature rise of transformer is directly proportional to
- 2 When secondary of transformer is short-circuited, the primary inductance
- 3 The no load input of power transformer practically equals which of the following loss of transformer
- 4 The transformer works on
- 5 A 3300/330, 50 kVA ideal transformer has 50 turns in secondary. The number of turns in primary side will be
The temperature rise of transformer is directly proportional to
The temperature rise of transformer is directly proportional to:
- Apparent power
- Leakage reactance
- Reactive power
- All of these
- None of these
Correct answer: 1. Apparent power
Explanation: Two types of losses occurring in a transformer are:
- Iron losses: Depend upon voltage
- Copper losses: Depend upon current
The losses create heat thus resulting in rise of temperature. Since iron losses depend upon voltage and copper losses depend upon current, the total temperature rise depends upon volt-ampere product only.
When secondary of transformer is short-circuited, the primary inductance
When secondary of transformer is short-circuited, the primary inductance:
- Is increased
- Is decreased
- Remains the same
- None of these
Correct answer: 2. Is decreased
The no load input of power transformer practically equals which of the following loss of transformer
The no load input of power transformer practically equals which of the following loss of transformer:
- Copper
- Iron
- Eddy current
- Sum of all of above
Correct answer: 2. Iron
The transformer works on
The transformer works on:
- AC only
- DC only
- Both of these
- None of these
Correct answer: 1. AC only
A 3300/330, 50 kVA ideal transformer has 50 turns in secondary. The number of turns in primary side will be
A 3300/330, 50 kVA ideal transformer has 50 turns in secondary. The number of turns in primary side will be:
- 200
- 500
- 750
- 1050
Correct answer: 2. 500
Explanation
K = E2/E1 = 330/3300 = 0.1
N2/N1 = K
50/N1 = 0.1
N1 = 500