GATE EE 1998 | Induction Machines Question 68 | Electrical Machines

GATE EE 1998

MCQ (Single Correct Answer)

-0.3

A 3-phase squirrel cage induction motor has a full load efficiency of 0.8 and a maximum efficiency of 0.9. It is operated at a slip of 0.6 by applying a reduced voltage. The efficiency of the motor at this operating point is:

less than 0.4

greater than 0.6

in the range of 0.8 $$\pm$$ 0.1

None of the above

GATE EE 1997

MCQ (Single Correct Answer)

-0.3

If an induction machine is run at above synchronous speed, it acts as

a synchronous motor

an induction generator

an induction motor

none of the above

GATE EE 1996

MCQ (Single Correct Answer)

-0.3

Unbalanced supply voltage given to a $$3-$$ phase, data-connected induction motor will cause

zero sequence currents

less heating of the rotor

negative sequence component current

all of these

GATE EE 1996

MCQ (Single Correct Answer)

-0.3

When the supply voltage to an induction motor is reduced by $$10\% $$, the maximum torque will decrease by approximately

$$5\% $$

$$10\% $$

$$20\% $$

$$40\% $$

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