Explore topic-wise MCQs in Design Electrical Machines.

This section includes 13 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_IS_THE_FORMULA_FOR_THE_NET_CROSS_SECTIONAL_AREA_OF_THE_CORE_OF_THE_TRANSFORMER??$

A. cross sectional area = voltage per turn * 4.44 * frequency * magnetic field
B. cross sectional area = voltage per turn / 4.44 * frequency * magnetic field
C. cross sectional area = voltage per turn * 4.44 / frequency * magnetic field
D. cross sectional area = voltage per turn * 4.44 * frequency / magnetic field
Answer» C. cross sectional area = voltage per turn * 4.44 / frequency * magnetic field
Discussion
2.

What is the formula for the width of the window of the transformer?$

A. width of the window = distance between core centers + diameter of the circumscribing circle
B. width of the window = distance between core centers – diameter of the circumscribing circle
C. width of the window = distance between core centers * diameter of the circumscribing circle
D. width of the window = distance between core centers / diameter of the circumscribing circle
Answer» C. width of the window = distance between core centers * diameter of the circumscribing circle
Discussion
3.

What is the formula for the diameter of the circumscribing circle of the transformer?$

A. diameter of the circumscribing circle = 2*square root of ratio of cross sectional area of the core to the space factor
B. diameter of the circumscribing circle = 3*square root of ratio of cross sectional area of the core to the space factor
C. diameter of the circumscribing circle = square root of ratio of cross sectional area of the core to the space factor
D. diameter of the circumscribing circle = 4*square root of ratio of cross sectional area of the core to the space factor
Answer» D. diameter of the circumscribing circle = 4*square root of ratio of cross sectional area of the core to the space factor
Discussion
4.

The range of the ratio of the height of the window to the width of the window is 2-4?

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

What is the formula for the height of the window?

A. height of window = area of window * width of the window
B. height of window = area of window + width of the window
C. height of window = area of window – width of the window
D. height of window = area of window / width of the window
Answer» E.
Discussion
6.

What is the formula for window area of the transformer?

A. window area = output power * 2.22 * frequency * magnetic field * window space factor * current density * area of cross section of the core *103
B. window area = output power / 2.22 * frequency * magnetic field * window space factor * current density * area of cross section of the core *103
C. window area = output power / 3.33 * frequency * magnetic field * window space factor * current density * area of cross section of the core *103
D. window area = output power * 3.33 * frequency * magnetic field * window space factor * current density * area of cross section of the core*103
Answer» C. window area = output power / 3.33 * frequency * magnetic field * window space factor * current density * area of cross section of the core *103
Discussion
7.

What is the formula to calculate the voltage per turn of the transformer?

A. voltage per turn = space factor * square root of output power
B. voltage per turn = space factor / square root of output power
C. voltage per turn = space factor / square root of output power
D. voltage per turn = space factor * 2*square root of output power
Answer» B. voltage per turn = space factor / square root of output power
Discussion
8.

What is the height of the single phase shell type transformer?

A. height = height of window + width of the largest stamping
B. height = 2*height of window + width of the largest stamping
C. height = height of window + 2* width of the largest stamping
D. height = height of window – width of the largest stamping
Answer» D. height = height of window ‚Äö√Ñ√∂‚àö√ë‚àö¬® width of the largest stamping
Discussion
9.

What is the formula for the width of the single phase shell type transformer ?

A. width = 2*Width of the window + width of the largest stamping
B. width = Width of the window + 4*width of the largest stamping
C. width = Width of the window + width of the largest stamping
D. width = 2*Width of the window + 4*width of the largest stamping
Answer» E.
Discussion
10.

The formula for single phase core type and three phase core type diameter and height are same?

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

What is the formula for the width over 2 limbs?

A. width = Width of largest stamping + Diameter of the transformer
B. width = Diameter + outer diameter of hv windings
C. width = Diameter – outer diameter of hv windings
D. width = outer diameter of hv windings
Answer» C. width = Diameter ‚Äö√Ñ√∂‚àö√ë‚àö¬® outer diameter of hv windings
Discussion
12.

What is the formula for height of the single phase core type transformer?

A. height = height of the window – height of the yoke
B. height = height of the window + height of the yoke
C. height = height of the window – (2*height of the yoke)
D. height = height of the window + (2*height of the yoke)
Answer» E.
Discussion
13.

What is the formula for the diameter of the single phase core type transformer?

A. D = diameter of circumscribing circle + Width of window
B. D = diameter of circumscribing circle – Width of window
C. D = diameter of circumscribing circle * Width of window
D. D = diameter of circumscribing circle / Width of window
Answer» B. D = diameter of circumscribing circle ‚Äö√Ñ√∂‚àö√ë‚àö¬® Width of window
Discussion