Electrical Machines - Electrical Engineering (MCQ) questions and answers
Dear Readers, Welcome to Electrical Machines multiple choice questions and answers with explanation. These objective type Electrical Machines questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma.
Specially developed for the Electrical Engineering freshers and professionals, these model questions are asked in the online technical test and interview of many companies.
These tutorial are also important for your viva in university exams like Anna university, Pune, VTU, UPTU, CUSAT etc.
1) Due to overdamping, the instrument will become
- Published on 04 Nov 15
a. Slow
b. Lethargic
c. Fast
d. Both (a) and (b)
e. None of these
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2) A differential relay comparator used for the protection of three phase transformers has
- Published on 30 Oct 15
a. One comparator
b. Two comparator
c. Three comparator
d. Six comparator
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3) In double delta transformation, a double delta refers to the case where there are two delta transformations in
- Published on 30 Oct 15
a. Parallel
b. Series
c. Both series and parallel
d. Neither series nor parallel
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4) Most familiar application of zig - zag transformer is as
- Published on 30 Oct 15
a. Ground reference on an ungrounded system
b. Converting single phase to two phase
c. Reducing harmonics
d. All of these
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5) In a single phase, full wave bridge circuit and in three phase, delta full wave bridge circuit, the ripple voltage frequency is always
- Published on 30 Oct 15
a. Twice the line frequency, six times the line frequency
b. Both will be twice the line frequency
c. Both will be six times the lines frequency
d. None of these
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Answer
Explanation
Related Ques
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ANSWER: Twice the line frequency, six times the line frequency
Explanation:
No explanation is available for this question!
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6) In Scott connection, the voltage across the teaser leads the mains by
- Published on 30 Oct 15
a. 30 degree
b. 60 degree
c. 90 degree
d. 120 degree
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7) Scott connection is used for the conversion of
- Published on 30 Oct 15
a. Single phase to three phase
b. Three phase to single phase
c. Single phase to two phase
d. All of these
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8) In T-T connection, the ratio of actual capacity to the available capacity is
- Published on 30 Oct 15
a. 1
b. 0.928
c. 1.928
d. 0.5
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9) In T-T connection, the percentage tapping of main transformer and teaser transformer are
- Published on 30 Oct 15
a. 50%, 86.6%
b. 50%, 50%
c. 86.6%, 86.6%
d. 86.6%, 50%
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10) With a bank of two single phase transformers connected in V - V fashion supplying a balanced three phase load with Cosφ as power factor. The power factor of the two transformers is given by
- Published on 30 Oct 15
a. Cosφ , Cosφ
b. Cosφ, Cos(30+φ)
c. Cos(30-φ), Cos(30+φ)
d. Cos(30-φ), Cosφ
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