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Electric Drives
Advanced Electric Drives
Quiz 1
Solution
Q.1.
Plugging is suitable for __________ type loads.
a) Gravitational
b) Electrostatic
c) Weightless
d) Leading
Q.2.
In DC shunt machine ∅ is directly proportional to Ia.
a) True
b) False
Q.3.
Braking resistance should be selected in order to limit the braking current.
a) True
b) False
Q.4.
Torque developed in the motor is ___________
a) KmΦIa
b) KmΦIa3
c) 2KmΦIa
d) KmΦIa2
Q.5.
Full form of TVR is _________
a) Terminal voltage reversal
b) Total voltage reversal
c) Terminal voltage redirect
d) Total voltage reversal
Q.6.
Calculate the current in DC shunt field winding using the following data: Ia=A, IL=R=N=484.
a) 4 A
b) 2 A
c) 7 A
d) 6 A
Q.7.
Calculate the flux produced by the DC shunt field winding using the following data: Ia=5 A, IL=R=N=4.
a) 14 Wb
b) 12 Wb
c) 17 Wb
d) 18 Wb
Q.8.
The shape of the speed-armature current characteristics in DC shunt motor is __________
a) Hyperbolic
b) Parabola
c) Negative slope linear line
d) Ellipse
Q.9.
The shape of the speed-torque characteristics in DC shunt motor is __________
a) Rectangular Hyperbolic
b) Whole x-y plane
c) Circle
d) Ellipse
Q.10.
DC shunt motors are used where the high _________ is required.
a) Starting torque
b) Maximum torque
c) Minimum torque
d) Breakdown torque
Q.11.
The shape of the current-torque characteristics in DC shunt motor is __________
a) Rectangular Hyperbola
b) Parabola
c) Straight line
d) Ellipse
Q.12.
The relationship between the torque(T) and power(P) developed in the DC shunt motor is ___________ (Neglecting all the losses)
a) T ∝ √P
b) T ∝ P2
c) T ∝ ∛P
d) T ∝ P
Q.13.
The value of current at time of starting is ___________
a) High
b) Low
c) Very low
d) 0
Q.14.
Calculate the bandwidth in series RLC circuit if the frequency isHz and the quality factor is 5.
a) 2 Hz
b) 4 Hz
c) 6 Hz
d) 8 Hz
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