electrician
1. Which of the following does not change in transformer ?
a) voltage
b) current
c)all of these
d)frequency
Answer- d) frequency
2. What is the basic three electrical quantities ?
a)none of these
b)resistance, capacitance, power
c)voltage, current, resistance
d)power, voltage, conductance
Answer- c) voltage, current, resistance
3. A transformer core is laminated to....
a) reduce copper current loss
b) reduce hysteresis loss
c) reduce eddy current loss
d) reduce all of them
Answer - c)reduce eddy current loss
4. The no load current draws by transformer is usually what percentage of the full load current....
a) 12 to 15 %
b) 0.2 to 0.5 %
c) 20 to 30 %
d) 2 to 5 %
Answer - d)2 to 5 %
5. No load on transformer is carried out to determine....
a) copper loss
b) Magnetizing current and iron loss
c) efficiency of the transformer
d) Magnetizing loss
Answer - b) Magnetizing current and iron loss
6. The dielectric strength of transformer oil is expected to be......
a) 330 KV
b) 33 KV
c) 100 KV
d) 1 KV
Answer - b) 33 KV
7. The efficiency of a transformer will be maximum when...
a) copper loss = iron loss
b) eddy current loss = copper loss
c) hysteresis loss = eddy current loss
d) copper loss = hysteresis loss
Answer - a) copper loss = iron loss
8. For conducting short circuit test on a transformer, which of the following side is not short circuited ?
a) high voltage side
b) low voltage side
c) primary side
d) secondary side
Answer - a) high voltage side
9. In case of short circuit________________current will flow in the circuit.
a) Infinite
b) normal
c) very low
d) zero
Answer - a) Infinite
10. Which one of the following is not a part of transformer installation.....
a) breather
b) conservator
c) none of these
d) exciter
Answer - d) exciter