Explore topic-wise MCQs in Design Electrical Machines.

This section includes 17 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 type of conductor is chosen for the small motors?

A. round
B. bar
C. skewed
D. rectangular
Answer» B. bar
Discussion
2.

The value of the current density of rotor is chosen almost equal to that in the stator.

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

What is the formula for the full load rotor mmf?

A. 65% of stator mmf
B. 75% of stator mmf
C. 85% of stator mmf
D. 90% of stator mmf
Answer» D. 90% of stator mmf
Discussion
4.

The rotor voltage on open circuit between slip rings should not exceed 500 V for small machines.

A. true
B. false
Answer» B. false
Discussion
5.

WHAT_IS_THE_FORMULA_FOR_THE_FULL_LOAD_ROTOR_MMF??$

A. 65% of stator mmf
B. 75% of stator mmf
C. 85% of stator mmf
D. 90% of stator mmf
Answer» D. 90% of stator mmf
Discussion
6.

What type of conductor is chosen for the small motors?$

A. round
B. bar
C. skewed
D. rectangular
Answer» B. bar
Discussion
7.

The_value_of_the_current_density_of_rotor_is_chosen_almost_equal_to_that_in_the_stator?$

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

What type of winding is made use of for the large motors?

A. mush windings
B. bar type windings
C. cross windings
D. rounded windings
Answer» C. cross windings
Discussion
9.

What type of winding is made use of for the small motors?

A. mush windings
B. cross windings
C. interconnected windings
D. rounded windings
Answer» B. cross windings
Discussion
10.

What is the formula for rotor turns per phase?

A. rotor turns per phase = (winding factor for stator/winding factor for rotor) * (Rotor voltage per phase/Stator voltage per phase) * Number of turns per phase for stator
B. rotor turns per phase = (winding factor for stator/winding factor for rotor) / (Rotor voltage per phase/Stator voltage per phase) * Number of turns per phase for stator
C. rotor turns per phase = (winding factor for stator/winding factor for rotor) * (Rotor voltage per phase/Stator voltage per phase) / Number of turns per phase for stator
D. rotor turns per phase = (winding factor for stator/winding factor for rotor) / (Rotor voltage per phase/Stator voltage per phase) / Number of turns per phase for stator
Answer» B. rotor turns per phase = (winding factor for stator/winding factor for rotor) / (Rotor voltage per phase/Stator voltage per phase) * Number of turns per phase for stator
Discussion
11.

What is the range of the rotor voltage for the large machines?

A. 1000-1500 V
B. 1000-1750 V
C. 500-1500 V
D. 1000-2000 V
Answer» E.
Discussion
12.

How should the rotor voltage be with respect to the high voltage and large machines?

A. low
B. moderate
C. high
D. very high
Answer» D. very high
Discussion
13.

The rotor voltage on open circuit between slip rings should not exceed 500 V for small machines?

A. true
B. false
Answer» B. false
Discussion
14.

What should be done to keep the rotor voltage to an acceptable level?

A. rotor to stator turns must be properly adjusted
B. stator to rotor turns must be properly adjusted
C. stator turns must be adjusted
D. rotor turns must be adjusted
Answer» C. stator turns must be adjusted
Discussion
15.

How many types of design of wound rotors are available?

A. 2
B. 3
C. 4
D. 5
Answer» D. 5
Discussion
16.

How should the number of slots be in the case of fractional slot windings?

A. multiples of slots
B. multiple of phases
C. multiple of phases and pair of poles
D. multiples of pair of poles
Answer» D. multiples of pair of poles
Discussion
17.

What is the rotor windings for wound rotor motors?

A. single phase windings
B. double phase windings
C. three phase windings
D. concentrated phase windings
Answer» D. concentrated phase windings
Discussion