Question 1

Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors ?

Accepted Answer

A) Low cost 
B) Wide speed range 
C) Stability 
D) High starting torque. 
A) Low cost 
B) Wide speed range 
C) Stability 
D) High starting torque.

Question 2

The armature torque of the D.C. shunt motor is proportional to

Accepted Answer

A) field flux only 
B) armature current only 
C) both (a) and (b) 
D) none of the above 
A) field flux only 
B) armature current only 
C) both (a) and (b) 
D) none of the above

Question 3

Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of

Accepted Answer

A) D.C. series motor 
B) D.C. shunt motor 
C) induction motor 
D) all of above motors 
A) D.C. series motor 
B) D.C. shunt motor 
C) induction motor 
D) all of above motors

Question 4

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be

Accepted Answer

A) level compounded 
B) under compounded 
C) cumulatively compounded 
D) differentially compounded 
A) level compounded 
B) under compounded 
C) cumulatively compounded 
D) differentially compounded

Question 5

Sparking, is discouraged in a D.C. motor because

Accepted Answer

A) it increases the input power con-sumption 
B) commutator gets damaged 
C) both (a) and (b) 
D) none of the above 
A) it increases the input power con-sumption 
B) commutator gets damaged 
C) both (a) and (b) 
D) none of the above

Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors ?

The armature torque of the D.C. shunt motor is proportional to

Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be

Sparking, is discouraged in a D.C. motor because

D.C. Motors and Their Applications

D.C. Motors

D.C. Motors and Generators

D.C. Generator and Motor Efficiency, Testing and Braking Techniques

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Exam 3: D.C. Motors and Speed Control

Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors ?

The armature torque of the D.C. shunt motor is proportional to

Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be

Sparking, is discouraged in a D.C. motor because

D.C. Motors and Their Applications

D.C. Motors

D.C. Motors and Generators

D.C. Generator and Motor Efficiency, Testing and Braking Techniques

Filters