Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity ?
Brake test
Field test
Swinburne’s test
Hopkinson’s test
Field test
Which D.C. motor has got maximum self relieving property ?
Series motor
Shunt motor
Cumulatively compounded motor
Differentially compounded motor
Series motor
Which D.C. motor is generally preferred for cranes and hoists ?
Differentially compounded motor
Cumulatively compounded motor
Shunt motor
Series motor
Series motor
For which types of D.C. motor dynamic braking is generally used ?
Shunt motors
Series motors
All of the above
Compound motors
All of the above
Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors ?
Low cost
High starting torque.
Stability
Wide speed range
Low cost
The armature voltage control of D.C. motor provides
constant torque drive
constant current drive
constant voltage drive
none of the above
constant torque drive
The speed of a D.C. shunt motor can be increased by
reducing the resistance in the armature circuit
increasing the resistance in field circuit
increasing the resistance in armature circuit
reducing the resistance in the field circuit
increasing the resistance in field circuit
In a differentially compounded D.C. motor if shunt field suddenly opens
the motor will first stop and then run in opposite direction as series motor
the motor will work as series motor and run at slow speed in the same direction
the motor will work as series motor and run at high speed in the same direction
the motor will not work and come to stop
the motor will first stop and then run in opposite direction as series motor
Which of the following motor has the poorest speed regulation ?
Cumulative compound motor
Differential compound motor
Shunt motor
Series motor
Series motor
Buses trains trolleys hoists cranes require high starting torque and therefore make use of
D.C. shunt motor
induction motor
D.C. series motor
all of above motors
D.C. series motor
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