GATE EE 2005 | Synchronous Machines Question 39 | Electrical Machines

GATE EE 2005

MCQ (Single Correct Answer)

-0.3

In relation to the synchronous machines, which one of the following statements is false?

In salient pole machines, the direct-axis synchronous reactance is greater than the quadrature-axis synchronous reactance

The damper bars help the synchronous motor self-start

Short circuit ratio is the ratio of the field current required to produce the rated voltage on open circuit to the rated armature current

The V-curve of a synchronous motor represents the variation in the armature current with field excitation, at a given output power

GATE EE 2004

MCQ (Single Correct Answer)

-0.3

The following motor definitely has a permanent magnet rotor

DC commutator motor

Brushless dc motor

Stepper motor

Reluctance motor

GATE EE 2004

MCQ (Single Correct Answer)

-0.3

For a given stepper motor, the following torque has the highest numerical value.

Detent torque

Pull-in torque

Pull-out torque

Holding torque

GATE EE 2003

MCQ (Single Correct Answer)

-0.3

A stand-alone engine driven Synchronous generator is feeding a partly inductive load. A capacitor is now connected across the load to completely nullify the inductive current. For this operating condition.

the field current and fuel input have to be reduced

the field current and fuel input have to be increased

the field current has to be increased and fuel input left unaltered

the field current has to be reduced and fuel input left unaltered

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