Question :

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to


A) the heating effect of current alone
B) hysteresis loss alone
C) both the heating effect of current and hysteresis loss
D) intense sunlight at noon

Answer : C

Description :



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Stars appears to move from east to west because


A) all stars move from east to west
B) the earth rotates from west to east
C) the earth rotates from east to west
D) the background of the stars moves from west to east

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Pa(Pascal) is the unit for


A) thrust
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C) frequency
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Nuclear sizes are expressed in a unit named.


A) Fermi
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Of the following properties of a wave, the one that is independent of the other is its


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Rectifiers are used to convert


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