Transformers

1. Delta/star transformer works satisfactorily when

load is balanced only
load is unbalanced only
on balanced as well as unbalanced loads
none of the above

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when" class="read-more button" href="https://exam.pscnotes.com/mcq/delta-star-transformer-works-satisfactorily-when/#more-59800">Detailed SolutionDelta/star transformer works satisfactorily when

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

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button" href="https://exam.pscnotes.com/mcq/in-case-of-a-double-cage-induction-motor-the-inner-cage-has/#more-59675">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

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4. Which of the following does not change in an ordinary transformer?

Frequency
Voltage
Current
Any of the above

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class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-does-not-change-in-an-ordinary-transformer/#more-59547">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

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64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube button" href="https://exam.pscnotes.com/mcq/a-no-load-test-is-performed-on-a-transformer-to-determine/#more-59325">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

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7. A transformer transforms

voltage
current
power
frequency

Detailed SolutionA transformer transforms

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8. The transformer ratings are usually expressed in terms of

volts
amperes
kW
kVA

Detailed Solution

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class="screen-reader-text">The 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

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button" href="https://exam.pscnotes.com/mcq/the-starting-torque-of-a-squirrel-cage-induction-motor-is/#more-58400">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

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288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube href="https://exam.pscnotes.com/mcq/the-path-of-the-magnetic-flux-in-transformer-should-have/#more-58396">Detailed SolutionThe path of the magnetic flux in transformer should have
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