1
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of $$5\% $$

If an auto-transformer is used for reduced voltage starting to provide $$1.5$$ per unit starting torque, the auto-transformer ratio $$\left( \% \right)$$ should be

A
$$57.77\% $$
B
$$72.56\% $$
C
$$78.25\% $$
D
$$81.33\% $$
2
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of $$5\% $$

If a star-delta starter is used to start this induction motor, the per unit staring torque will be

A
$$0.607$$
B
$$0.816$$
C
$$1.225$$
D
$$1.616$$
3
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of $$5\% $$

If a starting torque of $$0.5$$ per unit is required then the per unit starting current should be

A
$$4.65$$
B
$$3.75$$
C
$$3.16$$
D
$$2.13$$
4
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
The speed of a $$4$$-pole induction motor is controlled by varying the supply frequency while maintaining the ratio of supply voltage to supply frequency $$(V/f)$$ constant. At rated frequency of $$50$$ $$Hz$$ and rated voltage of $$400$$ $$V$$ its speed is $$1440$$ $$rpm$$. Find the speed at $$30$$ $$Hz,$$ if the load torque is constant
A
$$882$$ $$rpm$$
B
$$864$$ $$rpm$$
C
$$840$$ $$rpm$$
D
$$828$$ $$rpm$$
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