Electric Machine Design PART 8
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Attempt Free Electric Machine Design PART 8 Here. Read The Important Electrical MCQ From Below.
(A) high voltage transformers
(B) distribution transformers
(C) current transformers
(D) step up transformers.Get Answer
107. In case of air natural cooling, the cooling surface increases as the __________ of the size
(A) inverse
(B) inverse square
(C) square
(D) cube.
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108. In case of air natural cooling the losses increase as the __________ of the size
(A) inverse
(B) inverse square
(C) square
(D) cube.
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109. The heat generated in the transformer is dissipated to the surroundings mainly by
(A) conduction
(B) convection
(C) radiation
(D) all of the above.
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Electric Machine Design PART 8
110. The heat transfer by convection least depends on
(A) temperature difference
(B) air velocity
(C) surface area
(D) color of the paint.
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111. Oil for transformer cooling should have low
(A) dielectric strength
(B) viscosity
(C) flash point.
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112. Oil for transformer cooling should have high
(A) flash point
(B) viscosity
(C) sludging tendencies
(D) moisture content.
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113. The oil selected for transformer cooling should be free from
(A) alkalies
(B) acids
(C) sulphur
(D) all of the above.
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Electric Machine Design PART 8
114. Normally for the design of transformer the ambient temperature is taken as
(A) 20°C
(B) 25°C
(C) 45°C
(D) 75°C.
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115. A transformer is designed for certain ambient temperature. If it actually operates at a temperature 10°C above the design temperature its kVA rating should be
(A) increased by 10%
(B) reduced by 5%
(C) reduced by 10%
(D) reduced by 20%.
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116. The overload capacity of a transformer depends on
(A) ratio of full load copper losses to its iron losses
(B) size of the core
(C) frequency
(D) none of the above.
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Electric Machine Design PART 8
117. Which surge will be most damaging for a transformer ?
(A) steeper front flatter tail
(B) flatter front steeper tail
(C) uniform
(D) all will be equally damaging.
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118. A transformer is considered to have a network of series capacitance due to
(A) inter-turn insulation
(B) earthing
(C) laminated core
(D) surrounding tanks.
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119. In a transformer the shunt capacitance is decreased and series capacitance is increased by the use of
(A) shielded windings
(B) inter-leaved winding
(C) layer type winding
(D) any of the above.
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Electric Machine Design PART 8
120. An air core transformer as compared to iron-core transformer has
(A) Less magnetic core loss
(B) More magnetic core loss
(C) No magnetic core loss
(D) Less ohmic loss.
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