1
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
$$36.88A$$
2
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
Two $$3$$-phase, $$Y$$-connected alternators are to be paralleled to a set of common bus bars. The armature has a per phase synchronous reactance of $$1.7\Omega $$ and negligible armature resistance. The line voltage of the first machines is adjusted to $$3300$$ $$V$$ and that of the second machine is adjusted to $$3200$$ $$V.$$ the machine voltages are in phase at the instant they are paralleled. Under this condition, the synchronizing current per phase will be
A
$$16.98A$$
B
$$29.41A$$
C
$$33.96A$$
D
$$58.82A$$
3
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
A $$4$$-pole, $$3$$-phase, double layer winding is housed in a $$36$$-slot stator for an $$ac$$ machine with $$60$$ degree phase spread. Coil span is $$7$$ slot pitches. Number of slots in which top and bottom layers belong to different phases is.
A
$$24$$
B
$$18$$
C
$$12$$
D
$$0$$
4
GATE EE 2002
MCQ (Single Correct Answer)
+2
-0.6
The flux per pole in a synchronous motor with the field circuit ON and the stator disconnected from the supply is found to be $$25$$ $$mWb.$$ When the stator is connected to the rated supply with the field excitation unchanged, the flux per pole in the achine is found to be $$20$$ $$mWb$$ while the motor is running on no load. Assuming no load losses to be zero, the no load current down by the motor from the supply
A
lags the supply voltage
B
leads the supply voltage
C
is in phase with the supply voltage
D
is zero
GATE EE Subjects
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