GATE EE 2005 | GATE EE Year Wise Previous Years Questions

GATE EE 2005

MCQ (Single Correct Answer)

-0.6

Under no load condition, if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,

the speed decreases and the stator current increases

both the speed and the stator current decrease

the speed and the stator current remain practically constant

there is negligible change in the speed but the stator current decreases

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 2005

MCQ (Single Correct Answer)

-0.6

Assertion [a]: Under V/f control of induction motor, the maximum value of the developed torque remains constant over a wide range of speed in the subsynchronous region.

Reason [r]: The magnetic flux is maintained almost constant at the rated value by keeping the ratio V/f constant over the considered speed range.

Both [a] and [r] are true and [r] is the correct reason for [a]

Both [a] and [r] are true but [r] is not the correct reason for [a]

Both [a] and [r] are false

[a] is true but [r] is false

GATE EE 2005

MCQ (Single Correct Answer)

-0.3

Which three-phase connection can be used in a transformer to introduce a phase difference of 30° between its output and corresponding input line voltages

Star - Star

Star - Delta

Delta - Delta

Delta - Zigzag

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