TRANSFORMERS MCQs SET 15
1. What will be the value of voltage and current for a given transformer of 10 MVA, 220/4400-V which we are about to perform the Short circuit test?
a) 220 V, 30 A
b) 220 V, 2.27A
c) 440 V, 30 A
d) 440 V, 2.27 A
a) 220 V, 30 A
b) 220 V, 2.27A
c) 440 V, 30 A
d) 440 V, 2.27 A
Answer: b
2. We only get copper losses from the short circuit test.
a) True
b) False
a) True
b) False
Answer: a
3. With the help of short circuit calculations we get value of ____________
a) Individual resistance and inductance of both sides
b) Resistance and inductance of primary side
c) Resistance and inductance of primary side
d) Combined resistance and inductance of both sides
3. With the help of short circuit calculations we get value of ____________
a) Individual resistance and inductance of both sides
b) Resistance and inductance of primary side
c) Resistance and inductance of primary side
d) Combined resistance and inductance of both sides
Answer: d
4. Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. What will happen if the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency?
a) The magnitude of current will increase, but power factor will decrease
b) The magnitude of current will decrease, but power factor will increase
c) The magnitude of current will increase, power factor will increase
d) The magnitude of current will decrease, power factor will decrease
4. Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. What will happen if the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency?
a) The magnitude of current will increase, but power factor will decrease
b) The magnitude of current will decrease, but power factor will increase
c) The magnitude of current will increase, power factor will increase
d) The magnitude of current will decrease, power factor will decrease
Answer: d
5. Sumpner’s test is conducted on transformers to study effect of ____________
a) Temperature
b) Stray losses
c) All-day efficiency
d) Cannot be determined
5. Sumpner’s test is conducted on transformers to study effect of ____________
a) Temperature
b) Stray losses
c) All-day efficiency
d) Cannot be determined
Answer: a
6. Which of the following tests are enough to find all the parameters related to a transformer?
a) OC test
b) OC, SC test
c) OC, SC, Sumpner’s test
d) Sumpner’s test
6. Which of the following tests are enough to find all the parameters related to a transformer?
a) OC test
b) OC, SC test
c) OC, SC, Sumpner’s test
d) Sumpner’s test
Answer: c
7. Sumpner’s test is performed on _________
a) Single transformer at a time
b) Only two transformers at a time
c) Minimum 2 transformers at a time
d) Many transformers at a time
7. Sumpner’s test is performed on _________
a) Single transformer at a time
b) Only two transformers at a time
c) Minimum 2 transformers at a time
d) Many transformers at a time
Answer: b
8. In Sumpner’s test __________
a) Primaries can be connected in either way
b) Primaries are connected in parallel with each other
c) Primaries of both transformers are connected in series with each other
d) No need to connect primaries
8. In Sumpner’s test __________
a) Primaries can be connected in either way
b) Primaries are connected in parallel with each other
c) Primaries of both transformers are connected in series with each other
d) No need to connect primaries
Answer: b
9. Which test is sufficient for efficiency of two identical transformers under load conditions?
a) Short-circuit test
b) Back-to-back test
c) Open circuit test
d) Any of the above
9. Which test is sufficient for efficiency of two identical transformers under load conditions?
a) Short-circuit test
b) Back-to-back test
c) Open circuit test
d) Any of the above
Answer: b
10. In Sumpner’s test _____________
a) Two secondaries are connected in phase opposition
b) Two secondaries are connected in phase addition
c) Can be connected in either way
d) Never connected with each other
10. In Sumpner’s test _____________
a) Two secondaries are connected in phase opposition
b) Two secondaries are connected in phase addition
c) Can be connected in either way
d) Never connected with each other
Answer: a
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