In an electric motor the direction of current in the coil charge once in each ………………
A) two rotations
B) one rotation
C) half – rotation
D) one – fourth – rotation
1 Answers
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A current carrying circular coil has ‘n’ turns. The magnetic field produced in the entire coil is
C) ‘n’ times as large as that produced by a single turn
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In an electric motor which of the following rotates with the coil ?
A) commutator
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In an electric motor which of the following remains fixed with the coil ?
Correct option is B) brush
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The direction of rotation of motor will be reversed when the direction of the current is reversed.
D) AH of the above
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Whenever there is continuous changes of magnetic flux linked with closed coil a current is generated in coil. This is ……………..
C) Faraday’s law
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Take an electric motor and fix a disc to the shaft of the electric motor. Place a small wooden block and switch on the motor.
C) uniform circular
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A motor boat is to reach to a point `30^(@)` upstream on other side of a river flowing with velocity `5 m//s`.Velocity of motor boat with respect to w
Correct Answer - A, B, C
2 Answers 2 views
An electric motor exerts a constant torque `5Nm` on a fly wheel by which it is rotated at the rate of `420 rpm` The power of motor is
Correct Answer - C `p=tauomega`
2 Answers 2 views
When the current change from `+2A` to `2A` in `0.05` second, an e.m.f. of `8V` is induced in a coil. The coefficient of self-induction of the coil is
Correct Answer - A `e=L(di)/(dt)implies8=Lxx((2-(-2)))/(0.05)impliesL=0.1H`
2 Answers 1 views
A vertical rectangular coil of sides `5 cm xx 2 cm` has 10 turns and carries a current of `2A`. The torque ( couple) on the coil when it is placed in
Correct Answer - 2 `tau=BAIN cos theta`
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