1
GATE EE 1993
MCQ (Single Correct Answer)
+1
-0.3
VRN, VYN and VBN are the instantaneous line to neutral voltages and iR, iY and iB are instantaneous line currents in a balanced three-phase circuit, the computation, VRN (iy $$-$$ iB) $$-$$ (VYN $$-$$ VBN) iR will yield a quantity proportional to
A
The active power
B
The power factor
C
The reactive power
D
The complex power
2
GATE EE 1993
MCQ (Single Correct Answer)
+1
-0.3
A $$CRO$$ screen has ten divisions on the horizontal scale. If a voltage signal $$5$$ $$sin$$$$\left( {314t + {{45}^ \circ }} \right)$$ is examined with a line base setting of $$5$$ $$msec/div,$$ the number o0f cycles of signal displayed on the screen will be
A
$$0.5$$ cycles
B
$$2.5$$ cycles
C
$$5$$ cycles
D
$$10$$ cycles
3
GATE EE 1993
MCQ (Single Correct Answer)
+1
-0.3
A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited. The frequency of the currents flowing in the short circuited stator is
A
slip frequency
B
supply frequency
C
frequency corresponding to rotor speed
D
zero
4
GATE EE 1993
MCQ (Single Correct Answer)
+2
-0.6
A three phase alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed a field current of $${{\rm I}_f}$$ is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current
A
would be equal to $${{\rm I}_f}$$
B
would be equal to $$2$$ $${{\rm I}_f}$$
C
would be equal to $${{\rm I}_f}/2$$
D
cannot be predicted due to insufficient data
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Medical
NEET
Graduate Aptitude Test in Engineering
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Class 12