Explore topic-wise MCQs in Design Electrical Machines.

This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Design Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

The overhang leakage reactance depends on the degree of saturation in the ferromagnetic parts.

A. true
B. false
Answer» B. false
Discussion
2.

What are the factors the overhang leakage reactance is obtained?

A. length of the overhang
B. diameter of the overhang
C. shape of the overhang
D. length of the overhang along with the shape of the overhang
Answer» E.
Discussion
3.

What is the formula of the zigzag specific permeance?

A. zigzag specific permeance = average width of the rotor tooth * length / (1/2 * mmf per slot2)
B. zigzag specific permeance = average width of the rotor tooth / length * (1/2 * mmf per slot2)
C. zigzag specific permeance = average width of the rotor tooth * length * (1/2 * mmf per slot2)
D. zigzag specific permeance =1/ average width of the rotor tooth * length * (1/2 * mmf per slot2)
Answer» C. zigzag specific permeance = average width of the rotor tooth * length * (1/2 * mmf per slot2)
Discussion
4.

What is the formula for the zigzag permeance?

A. zigzag permeance = average width of the rotor tooth / (1/2 * mmf per slot2)
B. zigzag permeance = average width of the rotor tooth * (1/2 * mmf per slot2)
C. zigzag permeance = 1/average width of the rotor tooth *(1/2 * mmf per slot2)
D. zigzag permeance = average width of the rotor tooth *(1/2 / mmf per slot2)
Answer» B. zigzag permeance = average width of the rotor tooth * (1/2 * mmf per slot2)
Discussion
5.

The slotting produces harmonic fields which cause high frequency losses near the gap surface.

A. true
B. false
Answer» B. false
Discussion
6.

WHAT_IS_THE_FORMULA_FOR_THE_ZIGZAG_PERMEANCE??$

A. zigzag permeance = average width of the rotor tooth / (1/2 * mmf per slot2)
B. zigzag permeance = average width of the rotor tooth * (1/2 * mmf per slot2)
C. zigzag permeance = 1/average width of the rotor tooth *(1/2 * mmf per slot2)
D. zigzag permeance = average width of the rotor tooth *(1/2 / mmf per slot2)
Answer» B. zigzag permeance = average width of the rotor tooth * (1/2 * mmf per slot2)
Discussion
7.

What are the factors the overhang leakage reactance is obtained?$

A. length of the overhang
B. diameter of the overhang
C. shape of the overhang
D. length of the overhang along with the shape of the overhang
Answer» E.
Discussion
8.

What is the formula of the zigzag specific permeance?$

A. zigzag specific permeance = average width of the rotor tooth * length / (1/2 * mmf per slot2)
B. zigzag specific permeance = average width of the rotor tooth / length * (1/2 * mmf per slot2)
C. zigzag specific permeance = average width of the rotor tooth * length * (1/2 * mmf per slot2)
D. zigzag specific permeance =1/ average width of the rotor tooth * length * (1/2 * mmf per slot2)
Answer» C. zigzag specific permeance = average width of the rotor tooth * length * (1/2 * mmf per slot2)
Discussion
9.

What is the relation between the overhang specific permeance and the slot pitch?

A. overhang specific permeance is directly proportional to the slot pitch
B. overhang specific permeance is indirectly proportional to the slot pitch
C. overhang specific permeance is directly proportional to the square of the slot pitch
D. overhang specific permeance is indirectly proportional to the square of the slot pitch
Answer» C. overhang specific permeance is directly proportional to the square of the slot pitch
Discussion
10.

The overhang leakage reactance depends on the degree of the saturation in the ferromagnetic parts?

A. true
B. false
Answer» B. false
Discussion
11.

What is the formula for the stored energy at any position?

A. stored energy at any position = mmf per slot2 * permeance in a particular position
B. stored energy at any position =2 * mmf per slot2 * permeance in a particular position
C. stored energy at any position =1/2 * mmf per slot2 * permeance in a particular position
D. stored energy at any position =1/3 * mmf per slot2 * permeance in a particular position
Answer» D. stored energy at any position =1/3 * mmf per slot2 * permeance in a particular position
Discussion
12.

What are the factors the permeance depends upon in the zigzag leakage?

A. relative position of stator
B. relative position of rotor
C. relative position of stator and rotor
D. stored energy at any position
Answer» D. stored energy at any position
Discussion
13.

In which machine is the pulsation losses considerable?

A. synchronous motors
B. induction motors
C. dc shunt motors
D. dc series motors
Answer» C. dc shunt motors
Discussion
14.

The slotting produces harmonic fields which cause high frequency losses near the gap surface?

A. true
B. false
Answer» B. false
Discussion
15.

How are the pulsation losses aggravated?

A. if the air gap is small compared with slot openings
B. if the air gap is reduced
C. if the air gap is increased
D. if the air gap is made larger than the slot openings
Answer» B. if the air gap is reduced
Discussion
16.

In which machine part/parts does the pulsation loss occurs?

A. teeth
B. pole face
C. conductors
D. teeth and pole faces
Answer» E.
Discussion
17.

What is pulsation losses?

A. flux pulsations are caused due to the slotted armature
B. flux pulsations are caused due to the rotation of machine
C. flux pulsation occurs due to rotor slots are rotating
D. flux pulsations occur due to the change in reluctance
Answer» E.
Discussion
18.

What happens in the rotating electrical machine?

A. armatures are slotted
B. armatures are slotted and results in the movement of rotor
C. the rotor remains stationary
D. the rotor slots are rotating
Answer» C. the rotor remains stationary
Discussion