Explore topic-wise MCQs in Design Electrical Machines.

This section includes 11 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.

What happens in the case of the small shafts?

A. the diameter in the bearings should be about 1/3 of the maximum diameter
B. the diameter in the bearing should be about 2/3 of the maximum diameter
C. the diameter in the bearing should be about 2/5 of the maximum diameter
D. the diameter in the bearing should be about 1/5 of the maximum diameter
Answer» C. the diameter in the bearing should be about 2/5 of the maximum diameter
Discussion
2.

The critical speeds of rotation should be different from running speed of machine.

A. true
B. false
Answer» B. false
Discussion
3.

WHAT_HAPPENS_IN_THE_CASE_OF_THE_SMALL_SHAFTS??$

A. the diameter in the bearings should be about 1/3 of the maximum diameter
B. the diameter in the bearing should be about 2/3 of the maximum diameter
C. the diameter in the bearing should be about 2/5 of the maximum diameter
D. the diameter in the bearing should be about 1/5 of the maximum diameter
Answer» C. the diameter in the bearing should be about 2/5 of the maximum diameter
Discussion
4.

What happens when the diameter under armature is 150 mm or above?

A. diameter of the shaft in bearing is 100 mm smaller than the maximum diameter
B. diameter of the shaft in bearing is 90 mm smaller than the maximum diameter.
C. diameter of the shaft in bearing is 70 mm smaller than the maximum diameter.
D. diameter of the shaft in bearing is 50 mm smaller than the maximum diameter.
Answer» E.
Discussion
5.

What is the relation of the diameter of the shaft in the bearings to the diameter under the armature?

A. diameter of the shaft is very much greater than the diameter under the armature
B. diameter of the shaft is greater than the diameter under the armature
C. diameter of the shaft is equal to the diameter under the armature
D. diameter of the shaft is lesser than the diameter under the armature
Answer» E.
Discussion
6.

What is the formula of the diameter of the shaft?

A. diameter of the shaft = 5.5 + (output in watt/rps)1/3 mm
B. diameter of the shaft = 5.5 – (output in watt/rps)1/3 mm
C. diameter of the shaft = 5.5 * (output in watt/rps)1/3 mm
D. diameter of the shaft = 5.5 / (output in watt/rps)1/3 mm
Answer» D. diameter of the shaft = 5.5 / (output in watt/rps)1/3 mm
Discussion
7.

The critical speeds of rotation should be different from running speed of machine?

A. true
B. false
Answer» B. false
Discussion
8.

What is the second property of the shaft design?

A. the shaft design should be such that it has high rigidity
B. the shaft design should be such that it should have high tensile strength
C. the shaft design should be such that it should have high corrosion resistance
D. the shaft design should be such that it should withstand voltage fluctuations
Answer» B. the shaft design should be such that it should have high tensile strength
Discussion
9.

What should be the first property of the shaft design?

A. the shaft design should be such that the shaft must have enough corrosion resistance
B. the shaft design should be such that the shaft must have enough mechanical strength
C. the shaft design should be such that the shaft has enough tensile strength
D. the shaft design should be able to withstand the voltage fluctuations
Answer» C. the shaft design should be such that the shaft has enough tensile strength
Discussion
10.

What is the meaning of stiffness?

A. ability to transmit the power
B. ability to withstand the weight of the rotor
C. ability to withstand unbalanced magnetic pull
D. ability to withstand the weight of rotor and unbalanced magnetic pull
Answer» E.
Discussion
11.

What is the consideration for the determination of the diameter of shaft?

A. stiffness
B. voltage
C. current
D. rigidity
Answer» D. rigidity
Discussion