Electrical Machines Objective Questions
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Induction motor operation depends on
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Generators works on the principle of production
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Dynamic braking can be used for
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The condition for maximum running torque is
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The air gap between the yoke and armature is dc machine is kept very small
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At stand still condition the value of slip is
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A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is
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In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)
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Which of the following motors is /are widely used?
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DC machine is a
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Slot wedges in a dc machine is made up of
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A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by
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The motor operate in stable region at which of the following slip?
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A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is
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For P pole machine relation between electrical degrees and mechanical degrees is
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Which of the following pairs is/are correct?
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The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?
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Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?
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A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?
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Dynamic braking is very effective for
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In dc machine armature windings are placed on rotor because of the necessity for
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When maximum starting torque is obtained, rotor power is
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Which of the following induction motor has the highest starting torque?
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Which of the following motor has negative speed regulation?
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A commutator in dc machine provide ----------------- rectification?
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Which of the following machines have highest power factor with respect to magnetizing current?
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Dynamic braking is employed to brake
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Which of the following will vary the maximum torque?
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The speed of rotating magnetic field of 8 pole 50 Hz induction motor is
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In circle diagram for induction motor, diameter of circle represents which of the following ?
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Electrical Machines - 4
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