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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