Synchronous motors

61. The torque angle, in a synchronous motor, is the angle between

the supply voltage and the back e.m.f.
magnetising current and back e.m.f.
the rotating stator flux and rotor poles
none of the above

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angle between" class="read-more button" href="https://exam.pscnotes.com/mcq/the-torque-angle-in-a-synchronous-motor-is-the-angle-between/#more-49463">Detailed SolutionThe torque angle, in a synchronous motor, is the angle between

63. Synchronsizingpower of a synchronous machine is

direcly proportional to the synchronous reactance
inversely proportional to the synchronous reactance
equal to the synchronous reactance
none of the above

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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
class="read-more button" href="https://exam.pscnotes.com/mcq/synchronsizingpower-of-a-synchronous-machine-is/#more-49231">Detailed SolutionSynchronsizingpower of a synchronous machine is

64. The armature current of the synchronous motor

has large values for low excitation i niy
has large values for high excitation only
has large values for low and high excitation
any of the above

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current of the synchronous motor" class="read-more button" href="https://exam.pscnotes.com/mcq/the-armature-current-of-the-synchronous-motor/#more-48966">Detailed SolutionThe armature current of the synchronous motor

65. The back e.m.f. of a synchronous motor depends on

speed
load
load angle
all of the above

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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/the-back-e-m-f-of-a-synchronous-motor-depends-on/#more-48938">Detailed SolutionThe back e.m.f. of a synchronous motor depends on

66. The standard full-load power factor ratings for synchronous motors are

zero or 0.8 leading
unity or 0.8 lagging
unity or 0.8 leading
unity or zero

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ratings for synchronous motors are" class="read-more button" href="https://exam.pscnotes.com/mcq/the-standard-full-load-power-factor-ratings-for-synchronous-motors-are/#more-48932">Detailed SolutionThe standard full-load power factor ratings for synchronous motors are

67. Mostly, synchronous motors are of

alternator type machines
induction type machines
salient pole type machines
smooth cylindrical type machines

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of" class="read-more button" href="https://exam.pscnotes.com/mcq/mostly-synchronous-motors-are-of/#more-48661">Detailed SolutionMostly, synchronous motors are of

68. A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as

static condenser
condenser
synchronous condenser
none of the above

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power factor and does not drive a mechanical load is called as" class="read-more button" href="https://exam.pscnotes.com/mcq/a-synchronous-motor-which-works-on-a-leading-power-factor-and-does-not-drive-a-mechanical-load-is-called-as/#more-48257">Detailed SolutionA synchronous motor which works on a leading power factor and does not drive a mechanical load is called as

69. Armature of a synchronous machine is

Of reducing number of slip rings on the rotor
Armature is associated with large power as compared to the field circuits
Of difficulty of providing high voltage insulation on rotor

Detailed SolutionArmature of a synchronous machine is

70. Which of the following losses, in a synchronous motor, does not vary with load?

Windage loss
Copper losses
Any of the above
None of the above

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with load?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-losses-in-a-synchronous-motor-does-not-vary-with-load/#more-47889">Detailed SolutionWhich of the following losses, in a synchronous motor, does not vary with load?
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