1
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A $$100$$ $$kVA$$, $$415V,$$ star connected synchronous machine generates rated open circuit voltage $$415V$$ at a field current of $$15A.$$ The short circuit armature current at a field current of $$10A$$ is equal to the rated armature current. The per unit saturated synchronous reactance is
A
$$1.731$$
B
$$1.5$$
C
$$0.666$$
D
$$0.577$$
2
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A $$3$$ phase, $$3$$ stack, variable reluctance stepper motor has $$20$$ poles on each rotor and stator stack. The step angle of this stepper motor is
A
$$3$$ degrees
B
$$6$$ degrees
C
$$9$$ degrees
D
$$18$$ degrees
3
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
$$50\% $$
4
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
$$1791$$
GATE EE Subjects
EXAM MAP