Question 1

Which of the following statements regarding a reluctance motor is incorrect ?

Accepted Answer

A) It cannot be reversed, ordinarily 
B) It requires no D.C. field excitation for its operation 
C) It is nothing else but a single-phase, salient pole synchronous-induction motor 
D) Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluctance path bet¬ween stator and rotor

Question 2

Which of the following statements regarding reluctance-start motor is incorrect ?

Accepted Answer

A) It is similar to reluctance motor 
B) It is basically an induction motor and not a synchronous one 
C) So far as its basic working principle is concerned, it is similar to shaded pole motor 
D) the air-gap between rotor and salient poles is non- uniform

Question 3

In a A.C. series motor armature coils are usually connected to commutator

Accepted Answer

A) through resistance 
B) through reactances 
C) through capacitors 
D) solidly

Question 4

Which of the following motors is used for unity power factor ?

Accepted Answer

A) Hysteresis motor 
B) Schrage motor 
C) Universal motor 
D) Reluctance motor

Question 5

A universal motor is one which

Accepted Answer

A) can be operated either on D.C. or A.C. supply at approximately the same speed and output 
B) can be marketed internationally 
C) runs at dangerously high speed on no-load 
D) none of the above

Exam 4: Motor Types and Applications

Which of the following statements regarding a reluctance motor is incorrect ?

Which of the following statements regarding reluctance-start motor is incorrect ?

In a A.C. series motor armature coils are usually connected to commutator

Which of the following motors is used for unity power factor ?

A universal motor is one which