Electric Machine Design PART 11
Category –EE Online Test
Telegram-Join Us On Telegram
Attempt Free Electric Machine Design PART 11 Here. Read The Important Electrical MCQ From Below.
151. When D is the diameter and L is the length of rotor of an induction motor, the best power factor can be obtained when (P = no. of poles)
(A) D=L
(B) D = PF
(C) D = √(PL)
(D) D = 1.35 P √L.
Get Answer
152. The power factor of the induction motor will be __________ if the magnetizing current is __________
(A) low……low
(B) high……..high
(C) high…..low
(D) low ……. high.
Get Answer
153. The magnetizing current of an induction motor will be __________ for __________ air gap
(A) larger ………. smaller
(B) larger ……… larger
(C) smaller……. larger
(D) smaller ……….. smaller.
Get Answer
Electric Machine Design PART 11
154. In induction motors, small air gap __________ power factor and __________ noise level
(A) increases ………. reduces
(B) reduces ………. increases
(C) reduces……….also reduces
(D) increases……….also increases.
Get Answer
155. In induction motors, larger air gap __________ noise level and __________ cooling
(A) increases ………. improves
(B) reduces ………. improves
(C) reduces……….jeopardises
(D) increases……….jeopardises.
Get Answer
156. In case of induction motors, phase reactance of the winding is __________ proportional to the number of slots per pole per phase
(A) directly
(B) inversely.
Get Answer
157. In the design of induction motors, normally the number of slots per pole per phase is taken as
(A) two
(B) three
(C) three or more
(D) three or less.
Get Answer
158. Normally open type stator slots in induction motors are not provided because
(A) exciting current increases
(B) coils cannot be slid through the top
(C) time required for the winding will be large
(D) none of the above.
Get Answer
Electric Machine Design PART 11
159. In induction motors provided with open type slots the exciting current is __________ and power factor is __________
(A) high……….high
(B) low……….low
(C) high……….low
(D) low ………. high.
Get Answer
160. Which type of slots are generally used in induction motors ?
(A) Open type
(B) Semi-closed type
(C) Closed type
(D) None of the above.
Get Answer
161. In induction motors, the difference between the number of stator and rotor slots should not be
(A) P
(B) 2 P
(C) 5P
(D) any of the above.
Get Answer
Electric Machine Design PART 11
162. For avoiding cogging in induction motor the difference between the number of stator and rotor slots should not be
(A) P
(B) 3P
(C) 5 P
(D) any of the above.
Get Answer
163. In induction motor which of the following depends on the leakage reactance ?
(A) starting torque
(B) maximum torque
(C) starting current
(D) all of the above.
Get Answer
Electric Machine Design PART 11
164. Leakage reactance in induction motors may result from
(A) slot leakage flux
(B) overhang leakage flux
(C) differential leakage flux
(D) all of the above.
Get Answer
165. The slip rings of wound rotor machines are made from
(A) electrolytic copper
(B) brass
(C) cast iron
(D) mild steel.
Get Answer
