1
ETO 21ST BATCH CET EXAM ACTUAL
EXAM QUESTIONS AND ANSWERS FULL
BLUEPRINT
1. Which of the following does not change in an ordinary transformer?
A. Frequency
B. Voltage
C. Current
D. Any of the above
2. When a given transformer is run at its rated voltage but reduced
frequency , its
A. Flux density remains unaffected.
B. Iron losses are reduced
C. Core flux density is reduced
D. Core flux density is increased.
3. In a given transformer for given applied voltage, losses which
remain constant inrrespective of load changes are
A. Friction and windage losses
B. Copper losses
C. Hysteresis and eddy current losses
D. Non of the above
4. Star/Star transformer work satisfactorily when
A. load is unbalanced only
B. load is balanced only
C. On balanced as well as unbalanced
D. None of the above
,2
5. A transformer transforms
A. Voltage
B. Current
C. Power
D. Frequency
6. In a transformer the resistance between its primary and secondary
is
A. Zero
B. 1 Ohms
C. 1000 Ohms
D. Infinite
7. Power transformer are designed to have maximum efficiency at
A. Nearly full load
B. 70% full load
C. 50% full load
D. No load
8. A transformer core is laminated to
A. reduce hysteresis loss
B. Reduce eddy current losses
C. Reduce copper losses
D. Reduce all above losses
, 3
9. For a transformer, operating at constant load current maximum
efficiency will occur at
A.0.8 leading power factor
B. 0.8 lagging power factor
C. Zero power factor
D. Unity power factor
10. The function of conservator in a transformer is
A. To project against internal fault.
B. to reduce copper as well as core losses
C. To cool the transformer oil
D. To take care of the expansion and contraction of transformer oil due to variation of temperature of
surrounding.
11. If you used 400 W of power for 30hours, you have used
A. 1.3 KWh
B. 13.3 KWh
C. 1.2 KWh
D. 12 KWh
12. How much continuous current can be drawn from a 60Ah battery
for 14 h ?
A. 42.8 A
B. 428 A
C. 4.28 A
D. 4.2 A
ETO 21ST BATCH CET EXAM ACTUAL
EXAM QUESTIONS AND ANSWERS FULL
BLUEPRINT
1. Which of the following does not change in an ordinary transformer?
A. Frequency
B. Voltage
C. Current
D. Any of the above
2. When a given transformer is run at its rated voltage but reduced
frequency , its
A. Flux density remains unaffected.
B. Iron losses are reduced
C. Core flux density is reduced
D. Core flux density is increased.
3. In a given transformer for given applied voltage, losses which
remain constant inrrespective of load changes are
A. Friction and windage losses
B. Copper losses
C. Hysteresis and eddy current losses
D. Non of the above
4. Star/Star transformer work satisfactorily when
A. load is unbalanced only
B. load is balanced only
C. On balanced as well as unbalanced
D. None of the above
,2
5. A transformer transforms
A. Voltage
B. Current
C. Power
D. Frequency
6. In a transformer the resistance between its primary and secondary
is
A. Zero
B. 1 Ohms
C. 1000 Ohms
D. Infinite
7. Power transformer are designed to have maximum efficiency at
A. Nearly full load
B. 70% full load
C. 50% full load
D. No load
8. A transformer core is laminated to
A. reduce hysteresis loss
B. Reduce eddy current losses
C. Reduce copper losses
D. Reduce all above losses
, 3
9. For a transformer, operating at constant load current maximum
efficiency will occur at
A.0.8 leading power factor
B. 0.8 lagging power factor
C. Zero power factor
D. Unity power factor
10. The function of conservator in a transformer is
A. To project against internal fault.
B. to reduce copper as well as core losses
C. To cool the transformer oil
D. To take care of the expansion and contraction of transformer oil due to variation of temperature of
surrounding.
11. If you used 400 W of power for 30hours, you have used
A. 1.3 KWh
B. 13.3 KWh
C. 1.2 KWh
D. 12 KWh
12. How much continuous current can be drawn from a 60Ah battery
for 14 h ?
A. 42.8 A
B. 428 A
C. 4.28 A
D. 4.2 A
