load is balanced only
load is unbalanced only
on balanced as well as unbalanced loads
none of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionDelta/star transformer works satisfactorily when
Transformers
2. In case of a double cage induction motor, the inner cage has
high inductance arid low resistance
low inductance and high resistance
low inductance and low resistance
high inductance and high resistance
Answer is Right!
Answer is Wrong!
Detailed SolutionIn case of a double cage induction motor, the inner cage has
3. Which of the following does not change in a transformer?
Current
Voltage
Frequency
All of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionWhich of the following does not change in a transformer?
4. Which of the following does not change in an ordinary transformer?
Frequency
Voltage
Current
Any of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionWhich of the following does not change in an ordinary transformer?
5. A no-load test is performed on a transformer to determine
core loss
copper loss
efficiency
magnetising current E. magnetising current and loss
Answer is Right!
Answer is Wrong!
Detailed SolutionA no-load test is performed on a transformer to determine
6. The secondary winding of which of the following transformers is always kept closed?
Step-up transformer
Step-down transformer
Potential transformer
Current transformer
Answer is Right!
Answer is Wrong!
Detailed SolutionThe secondary winding of which of the following transformers is always kept closed?
7. A transformer transforms
voltage
current
power
frequency
Answer is Right!
Answer is Wrong!
8. The transformer ratings are usually expressed in terms of
volts
amperes
kW
kVA
Answer is Right!
Answer is Wrong!
Detailed SolutionThe transformer ratings are usually expressed in terms of
9. The starting torque of a squirrel-cage induction motor is
low
negligible
same as full-load torque
slightly more than full-load torque
Answer is Right!
Answer is Wrong!
Detailed SolutionThe starting torque of a squirrel-cage induction motor is
10. The path of the magnetic flux in transformer should have
high reluctance
low reactance
high resistance
low resistance
Answer is Right!
Answer is Wrong!
Detailed SolutionThe path of the magnetic flux in transformer should have