InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The direction of rmf when a single phase supply is given to stator of three phase induction motor is?(a) Zero(b) Ns(c) 2Ns(d) -NsI have been asked this question in an interview.This question is from Principle of Operation in portion Induction Machines of Electrical Machines |
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Answer» Correct CHOICE is (a) Zero |
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| 152. |
The rotor of a three phase induction motor can never attain synchronous speed.(a) True(b) FalseI have been asked this question in quiz.My question comes from Principle of Operation in section Induction Machines of Electrical Machines |
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Answer» The correct answer is (a) True |
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| 153. |
The great advantage of the double squirrel-cage induction motor over single cage rotor is that its _________(a) efficiency is higher(b) power factor is higher(c) slip is larger(d) starting current is lowerThe question was asked in an interview for internship.I'm obligated to ask this question of Induction Motor as a Transformer topic in section Induction Machines of Electrical Machines |
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Answer» RIGHT option is (d) starting current is lower For explanation I would say: The OUTER cage has higher resistance and low reactance while VICE versa for the inner cage. So at starting the current is confined to outer cage with the reduction in starting current IMPROVING the TORQUE. |
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| 154. |
An induction motor when started on load, it does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be _________(a) Locking(b) Plumming(c) Crawling(d) CoggingThe question was asked in final exam.Origin of the question is Induction Motor as a Transformer topic in section Induction Machines of Electrical Machines |
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Answer» The correct ANSWER is (c) Crawling |
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| 155. |
The low no load power factor _________(a) reduces full load operating pf(b) increases full load operating pf(c) reduces full load excitation voltage(d) increases full load excitation voltageI had been asked this question in semester exam.This is a very interesting question from Induction Motor as a Transformer topic in division Induction Machines of Electrical Machines |
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Answer» Right option is (a) REDUCES FULL load operating pf |
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| 156. |
At no load induction motor has possible power factor as _________(a) 0.2(b) 0.5(c) 0.65(d) 0This question was posed to me during an interview.Query is from Induction Motor as a Transformer in section Induction Machines of Electrical Machines |
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Answer» The CORRECT ANSWER is (a) 0.2 |
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| 157. |
Mechanically air gaps in induction motor are kept very low to avoid _________(a) lower power factor(b) lagging nature(c) magnetizing current(d) all of the mentionedThe question was asked in final exam.Enquiry is from Induction Motor as a Transformer in section Induction Machines of Electrical Machines |
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| 158. |
The no load current of the induction motor is high due to _________(a) long and high reluctance path between stator and rotor(b) mutual flux having moderate reluctance path between stator and rotor(c) leakage flux having low reluctance iron core(d) leakage flux having high reluctance iron coreThe question was posed to me in a job interview.I want to ask this question from Induction Motor as a Transformer topic in chapter Induction Machines of Electrical Machines |
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Answer» Right option is (a) long and high reluctance path between STATOR and rotor |
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| 159. |
The no load current of the transformer is very less due to _________(a) mutual flux having low reluctance iron core(b) mutual flux having high reluctance iron core(c) leakage flux having low reluctance iron core(d) leakage flux having high reluctance iron coreI had been asked this question by my school principal while I was bunking the class.I'm obligated to ask this question of Induction Motor as a Transformer topic in portion Induction Machines of Electrical Machines |
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Answer» CORRECT answer is (a) mutual flux having low reluctance iron core The BEST explanation: It is due to the low reluctance PATH, the flux requirement is low in the TRANSFORMER. |
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| 160. |
No load current in induction motor is 10-20% of full load current and the no load current of transformer is 2-6%.(a) True(b) FalseThe question was posed to me at a job interview.My question is from Induction Motor as a Transformer topic in chapter Induction Machines of Electrical Machines |
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Answer» The correct choice is (a) True |
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| 161. |
The rated current in induction motor for a three phase system is 100A. What can be the no load estimated current for the machine?(a) 12 A(b) 20 A(c) 30 A(d) 5 AThis question was posed to me in an interview for job.The above asked question is from Induction Motor as a Transformer in chapter Induction Machines of Electrical Machines |
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| 162. |
A 3-phase induction motor with its rotor blocked behaves similar to a _________(a) transformer under short circuit of secondary terminals(b) transformer under open circuit of secondary(c) synchronous motor under slip test(d) synchronous motor under open circuitI had been asked this question in an online quiz.This intriguing question originated from Induction Motor as a Transformer in portion Induction Machines of Electrical Machines |
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Answer» RIGHT CHOICE is (a) transformer under short CIRCUIT of secondary TERMINALS Easy explanation: It is analogous to transformer under the SHORTED terminals of the secondary. |
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| 163. |
An induction motor can be said analogous to _________(a) transformer(b) synchronous motor(c) universal motor(d) stepper motorThe question was asked in semester exam.My query is from Induction Motor as a Transformer topic in portion Induction Machines of Electrical Machines |
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Answer» CORRECT ANSWER is (a) transformer Explanation: An induction MOTOR has similar OPERATION as a transformer. |
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