MCQs of Design of Three Phase Induction Motor (Design of AC Machines - 2170909)

Design of AC Machines (2170909) MCQs

MCQs of Design of Three Phase Induction Motor

Showing 31 to 40 out of 97 Questions

31.

The diameter of the circle diagram is given by

(a)	Xs/Vs
(b)	Vs/Rs
(c)	Vs/Xs
(d)	Rs/Xs

32.

For ___________, the air gap length should be as small as possible.

(a)	good overload capacity
(b)	good power factor
(c)	Less Noise
(d)	Best Ventilation

33.

Which of the following empirical relations may be used to find out the air gap length of a large three-phase induction motor?

(a)	$l 𝑔 = 0.2 + 2 \sqrt{D L}$
(b)	$𝑙 𝑔 = 0.125 + 0.35 𝐷 + 𝐿 + 0.015 V_{a}$
(c)	$𝑙 𝑔 = 0.2 + 𝐷$
(d)	$𝑙 𝑔 = 1.6 \sqrt{D} - 0.25$

34.

Which of the following empirical relations used to find out the air gap length of a small three-phase induction motor?

(a)	$𝑙 𝑔 = 0.2 + 2 \sqrt{D L}$
(b)	$𝑙 𝑔 = 0.125 + 0.35 𝐷 + 𝐿 + 0.015 V a$
(c)	$𝑙 𝑔 = 0.2 + 𝐷$
(d)	All of these

35.

__________ must be check before finally deciding the dimensions of the Stator Slot.

(a)	Tooth Width
(b)	Minimum Tooth Width
(c)	Total nos. of Stator Slot
(d)	Slot Width

36.

Flux density in the Stator Teeth is depended on the ___________.

(a)	Tooth Width
(b)	Tooth Height
(c)	Stator Core Length
(d)	Stator Core Depth

37.

To keep Iron Losses & Magnetizing MMF within the limit. Flux density in the Stator Teeth should not exceed the ______ Wb/m² in the design of three-phase induction motor.

(a)	1.1
(b)	1.5
(c)	1.7
(d)	1.1 to 1.7

38.

What is the permissible limit of tooth flux density (Wb/m²) in the design of three-phase induction motor?

(a)	1.1 to 1.4
(b)	1 to 1.8
(c)	1.1 to 1.7
(d)	1.7

39.

What if the tooth width of the stator should increase beyond a certain value in the design of three-phase induction motor?

(a)	Slot width became narrow
(b)	deep slots required to accommodate conductor/slot
(c)	leakage reactance increased
(d)	All of these

40.

In three-phase induction motor design, Flux density in the Stator core is depended on the ___________.

(a)	Tooth Width
(b)	Tooth Height
(c)	Stator Core Length
(d)	Stator Core Depth

Showing 31 to 40 out of 97 Questions