1
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A $$4$$ pole, $$50$$ $$Hz,$$ synchronous generator has $$48$$ slots in which a double layer winding is house. Each coil has $$10$$ turns and is short pitched by an angle to $$36$$ degrees electrical. The fundamental flux per pole is $$0.025$$ $$Wb$$

The line to line induced $$emf,$$ for two phase connection is

A
$$1143$$
B
$$1332$$
C
$$1617$$
D
$$1791$$
2
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A $$3$$-phase $$4000$$ $$V,$$ $$5$$ $$kW,$$ star connected synchronous motor having an internal reactance of $$10$$ $$ohms$$ is operating at $$50\% $$ load, unity power factor. Now, the excitation is increased by $$1\% $$, what will be the new load in percent, if the power factor is to be kept same? Neglect all losses and consider linear magnetic circuit.
A
$$67.9\% $$
B
$$56.9\% $$
C
$$51\% $$
D
$$50\% $$
3
GATE EE 2006
MCQ (Single Correct Answer)
+1
-0.3
A synchronous generator is feeding a zero power factor (lagging) load at rated current the armature reaction is
A
magnetizing
B
demagnetizing
C
cross magnetizing
D
Ineffective
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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