1
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
A $$4$$ pole dynamo with wave wound armature has $$51$$ slots containing $$20$$ conductors in each slot. The induced $$emf$$ is $$357$$ volts and the speed is $$5800$$ $$rpm$$. The flux per pole will be
A
$$3.5$$ $$mWb$$
B
$$1.2$$ $$mWb$$
C
$$14mWb$$
D
$$21$$ $$mWb$$
2
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
A differentially compounded d.c. motor with interpoles and with brushes on the neutral axis is to be driven as a generator in the same direction with the same polarity of the terminal voltage. It will then
A
be a cumulatively compound generator but the interpole coil connections are to be reversed
B
be a cumulatively compounded generator without reversing the interpole coil connections.
C
be a differentially compounded generator without reversing the interpole coil connections
D
be a differentially compounded generator but the interpole coil connections are to be reversed.
3
GATE EE 1993
MCQ (Single Correct Answer)
+1
-0.3
A cumulative compounded long shunt motor is driving a load at rated torque and rated speed. If the series field is shunted by a resistance equal to the resistance of the series field, keeping the torque constant. GATE EE 1993 Electrical Machines - D.C Machines Question 5 English
A
the armature current increases
B
the motor speed increases
C
the armature current decreases
D
the motor speed decreases
4
GATE EE 1992
MCQ (Single Correct Answer)
+1
-0.3
Neglecting all losses, the developed torque $$(T)$$ of $$d.c.$$ separately excited motor, operating under constant terminal voltage, is related to its output power $$(P)$$ as under
A
$$T\,\, \propto \,\,\sqrt P $$
B
$$T\,\, \propto \,\,P$$
C
$${T^2}\,\, \propto \,\,{P^3}$$
D
$$T$$ independent of $$P$$
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