button" href="https://exam.pscnotes.com/mcq/the-use-of-higher-flux-density-in-the-transformer-design/#more-50952">Detailed SolutionThe use of higher flux density in the transformer design

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

temperature
stray losses
all-day efficiency
none of the above

Subscribe on YouTube

button" href="https://exam.pscnotes.com/mcq/sumpners-test-is-conducted-on-transformers-to-determine/#more-50879">Detailed SolutionSumpner’s test is conducted on transformers to determine

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

Air motor
Induction motor
Shunt motor
Synchronous motor

Detailed Solution

Subscribe on YouTube

class="screen-reader-text">Which 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

Detailed SolutionAuto-transformer

makes effective saving on copper and copper losses, when its transformation ratio is

66. The maximum efficiency of a distribution transformer is

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

Subscribe on YouTube

distribution transformer 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

Subscribe on YouTube

button" href="https://exam.pscnotes.com/mcq/an-ideal-transformer-has-infinite-values-of-primary-and-secondary-inductances-the-statement-is/#more-50361">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

SolutionThe 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

Detailed Solution

Subscribe on YouTube

class="screen-reader-text">For 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

Join Our Telegram Channel

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 a change of 15 A in the load current. This results in change of supply current of" class="read-more button" href="https://exam.pscnotes.com/mcq/in-a-step-down-transformer-there-is-a-change-of-15-a-in-the-load-current-this-results-in-change-of-supply-current-of/#more-50105">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

Test 1Test 2Test 3
Exit mobile version