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Dc Machines
Dc Machines Multiple Choice
Quiz 1
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Q.1
Net field current in a compound motor is given by ______________
a) If (net)= If + (Nse/Nf) Ia
b) If (net)= If – (Nse/Nf) Ia
c) If (net)= If + (Nf/Nse) Ia
d) If (net)= If – (Nf/Nse) Ia
Q.2
With increase in armature current, speed of the cumulative compound motor _________
a) Reduces slowly compare to shunt motor
b) Reduces sharply compare to shunt motor
c) Remains constant
d) Increases in proportionality with armature current
Q.3
Speed current characteristic of cumulative DC compound motor at larger values of armature current is similar to that of _____________
a) DC shunt motor
b) Induction motor
c) DC differential compound motor
d) DC series motor
Q.4
Differential compound motor is used in large number of applications.
a) True
b) False
Q.5
Where speed-current characteristic of DC shunt motor lies with respect to DC cumulative compound motor (assume current greater than full load current)?
a) Can be represented by same curve
b) Above
c) Below
d) Cannot be determined
Q.6
Where speed-current characteristic of DC shunt motor lies with respect to DC cumulative compound motor (assume current smaller than full load current)?
a) Can be represented by same curve
b) Above
c) Below
d) Cannot be determined
Q.7
Only motor listed below whose speed increases with increase in armature current is ___________
a) DC series motor
b) DC cumulative compound motor
c) DC shunt motor
d) DC differential compound motor
Q.8
Torque of the cumulative compound DC motor is _____________
a) Addition of Ia and Ia2 term
b) Subtraction of Ia from Ia2 term
c) Subtraction of Ia2 from Ia term
d) Addition of -Ia and -Ia2 term
Q.9
Torque-current characteristic of DC cumulative compound motor _____________
a) Lies above shunt motor characteristic
b) Lies below shunt motor characteristic
c) Lies above of series and shunt motor characteristic both
d) Lies between of series and shunt motor characteristic both
Q.10
For strong series field, speed-torque characteristic of cumulative compound motor lies __________
a) Above series motor characteristic if current is less than full load current
b) Above shunt motor characteristic if current is less than full load current
c) Below series motor characteristic if current is more than full load current
d) Below series motor characteristic if current is less than full load current
Q.11
Which of the following DC motor has negative speed regulation?
a) Shunt motors
b) Series motors
c) Differential compound motors
d) Series and differential compound motors
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