1
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
For a $$1.8$$ degree, $$2$$-phase bipolar stepper motor, the stepping rate is $$100$$ steps/second. The rotational speed of the motor in $$rpm$$ is
A
$$15$$
B
$$30$$
C
$$60$$
D
$$90$$
2
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A $$400$$ $$V,$$ $$50$$ $$kVA,$$ $$0.8$$ $$pf$$ leading delta connected, $$50$$ $$Hz$$ synchronous machine has a synchronous reactance of $$2$$ $$ohm$$ and negligible armature resistance. The friction and windage losses are $$2$$ $$kW$$ and the core loss is $$0.8$$ $$kW.$$ The shaft is supplying $$9$$ $$kW$$ load at a power factor of $$0.8$$ leading. The line current drawn is
A
$$12.29A$$
B
$$16.24A$$
C
$$21.29A$$
D
$$36.88A$$
3
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A $$500$$ $$MW$$ $$3$$-phase $$Y$$-connected synchronous generator has a rated voltage of $$21.5kV$$ at $$0.85$$ $$pf.$$ The line current when operating at full load rated conditions will be
A
$$13.43$$ $$A$$
B
$$15.79$$ $$kA$$
C
$$23.25$$ $$kA$$
D
$$27.36$$ $$kA$$
4
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A hydraulic turbine having rated speed of $$250$$ $$rpm$$ is connected to a synchronous generator. In order to produce power at $$50$$ $$Hz,$$ the number of poles required in the generator are
A
$$6$$
B
$$12$$
C
$$16$$
D
$$24$$
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