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Electric Drives
Electric Drives Exam
Quiz 1
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Q.1
Calculate the angular frequency of the waveform y(t)=69sin(40πt+4π).
a) 40π Hz
b) 60π Hz
c) 70π Hz
d) 20π Hz
Q.2
The generated e.m.f from 22-pole armature havingturns driven atrpm having flux per pole asmWb, with lap winding is ___________
a) 76 V
b) 77 V
c) 78 V
d) 79 V
Q.3
Calculate the phase angle of the sinusoidal waveform u(t)=154sin(9.85πt-π÷89).
a) -78π÷9
b) -12π÷5
c) -π÷89
d) -2π÷888
Q.4
Calculate the moment of inertia of the stick about its end having a mass ofkg and length ofcm.
a) .088 kgm2
b) .087 kgm2
c) .089 kgm2
d) .086 kgm2
Q.5
Calculate the moment of inertia of the stick about its center having a mass of 1.1 kg and length of 2.9 m.
a) .66 kgm2
b) .77 kgm2
c) .88 kgm2
d) .47 kgm2
Q.6
Calculate the useful power developed by a motor using the given data: Eb =and I =A. Assume frictional losses are 3 W and windage losses are 2 W.
a) 203 W
b) 247 W
c) 211 W
d) 202 W
Q.7
Calculate the value of the frequency if the capacitive reactance is .1 Ω and the value of the capacitor is .F.
a) 71.25 Hz
b) 81.75 Hz
c) 79.61 Hz
d) 79.54 Hz
Q.8
The slope of the V-I curve is 6.9°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
a) .38 Ω
b) .59 Ω
c) .34 Ω
d) .12 Ω
Q.9
Calculate the active power in anH inductor.
a) 8645 W
b) 6485 W
c) 0 W
d) 4879 W
Q.10
Calculate the active power in aF capacitor.
a) 581 W
b) 897 W
c) 0 W
d) 892 W
Q.11
Calculate the active power in aH inductor.
a) 28 W
b) 189 W
c) 4 W
d) 0 W
Q.12
Calculate the active power in anΩ resistor with .A current flowing through it.
a) 547.12 W
b) 474.24 W
c) 554.78 W
d) 123.88 W
Q.13
Which one of the following methods would give a lower than the actual value of regulation of the alternator?
a) ZPF method
b) MMF method
c) EMF method
d) ASA method
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