EXAMIANS
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by
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Which of the following statements are correct ?
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The functions of inter poles are
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When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be
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In escalator which motor is used?
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In field flux method speed control of DC Motor is
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If the source voltage of a DC motor is increased, which of the following will decrease?
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Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,
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The introduction of interpoles in between the main poles improves the performance of a dc machine, because
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The torque angle, in a synchronous motor, is the angle between
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