Explore topic-wise MCQs in Electrical Machines.

This section includes 30 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

The shell type transformers have, LV and HV windings are arranged such that _________

A. Half LV near the core and half HV outside LV on each limb
B. LV one one limb and HV on the other
C. Half LV outside the core and half HV inside LV on each limb
D. LV and HV windings are sandwiched
Answer» E.
Discussion
2.

Core type transformers have, LV and HV windings are arranged such that _________

A. Half LV near the core and half HV outside LV on each limb
B. LV one one limb and HV on the other
C. Half LV outside the core and half HV inside LV on each limb
D. LV and HV windings are sandwiched
Answer» B. LV one one limb and HV on the other
Discussion
3.

Stepping of the core is implemented in the core to _________

A. reduce conductor material and copper losses
B. reduce core loss
C. to provide mechanical strength
D. to reduce magnetizing current
Answer» B. reduce core loss
Discussion
4.

I. Pulse transformers use soft ferrites. II. The transformers used in the radio recievers use air core.

A. Only I is true
B. Only II is true
C. I and II are true
D. I and II are false
Answer» D. I and II are false
Discussion
5.

A coupling magnetic field inside a rotating machine or static machine like transformers must involve with _________

A. mechanical parts
B. electrical parts
C. both electrical and mechanical
D. either of the electrical or mechanical parts
Answer» B. electrical parts
Discussion
6.

Transformers do not require any type of cooling as it well ventilated.

A. True
B. False
Answer» C.
Discussion
7.

Consider two transformers X and Y having identical ratings, but have flux densities of 1.5T and 2T respectively. The weight of the transformer B per KVA will be _________

A. more than that of A
B. lesser than that of A
C. equal to that of A
D. can not be said from the given data
Answer» C. equal to that of A
Discussion
8.

Consider two transformers X and Y having exact ratings, but have flux densities of 1.5T and 2T respectively. The weight of the transformer A per KVA will be _________

A. more than that of B
B. lesser than that of B
C. equal to that of B
D. can not be said from the given data
Answer» B. lesser than that of B
Discussion
9.

It is advised that staggering of the butt joints _________

A. reduces reluctance of the path
B. increases air gap
C. increases mechanical strength
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
10.

The leakage flux is the flux in side the transformer which?

A. links either of the windings
B. links both of the windings
C. yoke of the core
D. windows of the core
Answer» B. links both of the windings
Discussion
11.

Which is the most widely used material in the core of the transformer?

A. cold rolled grain oriented sheet steel
B. cold rolled grain steel
C. soft iron
D. steel
Answer» B. cold rolled grain steel
Discussion
12.

It was needed that to isolate dc noise coming from the transmitted signal, to attain the same which machine can be used without suffering significant loss?

A. transformer
B. dc machine
C. induction machine
D. stepper motor
Answer» B. dc machine
Discussion
13.

A transformer has comparitively much higher efficiency than a similar induction machine due to _________

A. small air gaps
B. no moving parts
C. strong coupling
D. all of the mentioned
Answer» E.
Discussion
14.

We can employ transformers for a power range of _________

A. lower and higer values
B. lower values
C. higher values
D. medium values
Answer» B. lower values
Discussion
15.

CONSIDER_TWO_TRANSFORMERS_X_AND_Y_HAVING_IDENTICAL_RATINGS,_BUT_HAVE_FLUX_DENSITIES_OF_1.5T_AND_2T_RESPECTIVELY._THE_WEIGHT_OF_THE_TRANSFORMER_B_PER_KVA_WILL_BE?$

A. more than that of A
B. lesser than that of A
C. equal to that of A
D. can not be said from the given data
Answer» C. equal to that of A
Discussion
16.

A coupling magnetic field inside a rotating machine or static machine like transformers must involve with$

A. mechanical parts
B. electrical parts
C. both electrical and mechanical
D. either of the electrical or mechanical parts
Answer» B. electrical parts
Discussion
17.

Transformers_do_not_require_any_type_of_cooling_as_it_well_ventilated.$

A. True
B. False
Answer» C.
Discussion
18.

The shell type transformers have, LV and HV windings are arranged such that

A. Half LV near the core and half HV outside LV on each limb
B. LV one one limb and HV on the other
C. Half LV outside the core and half HV inside LV on each limb
D. LV and HV windings are sandwiched
Answer» E.
Discussion
19.

Core type transformers have, LV and HV windings are arranged such that

A. Half LV near the core and half HV outside LV on each limb
B. LV one one limb and HV on the other
C. Half LV outside the core and half HV inside LV on each limb
D. LV and HV windings are sandwiched
Answer» B. LV one one limb and HV on the other
Discussion
20.

Stepping of the core is implemented in the core to

A. reduce conductor material and copper losses
B. reduce core loss
C. to provide mechanical strength
D. to reduce magnetizing current
Answer» B. reduce core loss
Discussion
21.

I. Pulse transformers use soft ferrites.

A.
B. Only I is true
C. Only II is true
Answer» D.
Discussion
22.

A_coupling_magnetic_field_inside_a_rotating_machine_or_static_machine_like_transformers_must_involve_with

A.
B.
Answer» C.
Discussion
23.

Consider two transformers X and Y having exact ratings, but have flux densities of 1.5T and 2T respectively. The weight of the transformer A per KVA will b?

A. more than that of B
B. lesser than that of B
C. equal to that of B
D. can not be said from the given data
Answer» B. lesser than that of B
Discussion
24.

It is advised that staggering of the butt joints

A. reduces reluctance of the path
B. increases air gap
C. increases mechanical strength
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
25.

The leakage flux is the flux in side the transformer which

A. links either of the windings
B. links both of the windings
C. yoke of the core
D. windows of the core
Answer» B. links both of the windings
Discussion
26.

The most widely used material in the core of the transformer is

A. cold rolled grain oriented sheet steel
B. cold rolled grain steel
C. soft iron
D. steel
Answer» B. cold rolled grain steel
Discussion
27.

It was needed that to isolate dc noise coming from the transmitted signal, to attain the same which machine can be used without suffering significant loss

A. transformer
B. dc machine
C. induction machine
D. stepper motor
Answer» B. dc machine
Discussion
28.

A transformer has comparitively much higher efficiency than a similar induction machine due to

A. small air gaps
B. no moving parts
C. strong coupling
D. all of the mentioned
Answer» E.
Discussion
29.

We can employ transformers for a power range of

A. lower and higer values
B. lower values
C. higher values
D. medium values
Answer» B. lower values
Discussion
30.

The primary and secondary of a transformer are ________ coupled but _______ connected.

A. magnetically, not electrically
B. electrically, not magnetically
C. magnetically, also magnetically
D. electrically, also electrically
Answer» B. electrically, not magnetically
Discussion