63. Sumpner’s test is conducted on transformers to determine

temperature
stray losses
all-day efficiency
none of the above

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64. Which motor is preferred for use in mines where explosive gases exist?

Air motor
Induction motor
Shunt motor
Synchronous motor

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exist?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-motor-is-preferred-for-use-in-mines-where-explosive-gases-exist/#more-50753">Detailed SolutionWhich motor is preferred for use in mines where explosive gases exist?

65. Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is

approximately equal to one
less than one
great than one
none of the above

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66. The maximum efficiency of a distribution transformer is

at no load
at 50% full load
at 80% full load
at full load

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is" class="read-more button" href="https://exam.pscnotes.com/mcq/the-maximum-efficiency-of-a-distribution-transformer-is/#more-50389">Detailed SolutionThe maximum efficiency of a distribution transformer is

67. An ideal transformer has infinite values of primary and secondary inductances. The statement is

TRUE
nan
nan
nan

Detailed SolutionAn ideal

transformer has infinite values of primary and secondary inductances. The statement is

68. The path of a magnetic flux in a transformer should have

high resistance
high reluctance
low resistance
low reluctance

Detailed Solution

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class="screen-reader-text">The path of a magnetic flux in a transformer should have

69. For a transformer, operating at constant load current, maximum efficiency will occur at

0.8 leading power factor
0.8 lagging power factor
zero power factor
unity power factor

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maximum efficiency will occur
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at" class="read-more button" href="https://exam.pscnotes.com/mcq/for-a-transformer-operating-at-constant-load-current-maximum-efficiency-will-occur-at/#more-50195">Detailed SolutionFor a transformer, operating at constant load current, maximum efficiency will occur at

70. In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of

less than 15 A
more than 15 A
15 A
none of the above

Detailed SolutionIn a step-down

transformer, there is a change of 15 A in the load current. This results in change of supply current of


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