1
GATE EE 1993
MCQ (Single Correct Answer)
+2
-0.6
Two $$550$$ $$kVA$$ alternators operate in parallel to supply the following loads
$$(i)$$ $$250$$ $$kW$$ at $$0.95$$ power factor lag
$$(ii)$$ $$100$$ $$kW$$ at $$0.8$$ power factor lead one machine is supplying $$200kW$$ at $$0.9$$ power factor lag. The power factor of the other machine must be

A
$$0.89$$ lead
B
$$0.95$$ lead
C
$$0.95$$ lag
D
$$0.89$$ lag
2
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
3
GATE EE 1993
MCQ (Single Correct Answer)
+2
-0.6
A $$220/440$$ $$V,$$ $$50$$ $$Hz$$ single phase transformer operates on $$220$$ $$V,$$ $$40$$ $$Hz$$ supply with secondary winding. Then
A
the eddy current loss and hysteresis loss of the transformer decrease
B
the eddy current loss and hysteresis loss of the transformer increase
C
the hysteresis loss of the transformer increases while eddy current loss remains the same
D
the hysteresis loss remains the same whereas eddy current loss decreases
4
GATE EE 1993
MCQ (Single Correct Answer)
+1
-0.3
The line integral of the vector potential A around the boundary of a surface S represents
A
flux through the surface S
B
flux density in the surface S
C
magnetic density
D
current density
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