GATE EE 2001 | D.C Machines Question 40 | Electrical Machines

GATE EE 2001

MCQ (Single Correct Answer)

-0.3

In case of an armature controlled separately excited dc motor drive with closed loop speed control, an inner current loop is useful because it

limits the speed of the motor to a safe value

helps in improving the drive energy efficiency

limits the peak current of the motor to the permissible value

reduces the steady state speed error

GATE EE 2000

MCQ (Single Correct Answer)

-0.3

The compensating winding in a dc machine

is located in armature slots for compensation of the armature reaction

is located on commutating poles for improving the commutation

is located on pole shoes for avoiding the flashover at the commutator surface

is located on poles shoes to avoid the sparking at the brushes.

GATE EE 2000

MCQ (Single Correct Answer)

-0.3

Ratio of the rotor reactance X to the rotor resistance R for a two-phase servomotor

is equal to that of a normal induction motor

is less than that of a normal induction motor

is greater than that of a normal induction motor

may be less or greater than that of a normal induction motor

GATE EE 2000

MCQ (Single Correct Answer)

-0.3

A 1.8° step, 4-phase stepper motor has a total of 40 teeth on 8 poles of stator. The number of rotor teeth for this motor will be

100

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