The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
A. D.c. series motor .
B. D.c. shunt motor
C. Induction motor
D. Synchronous motor
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The design of mechanical parts is particularly important in case of __________ speed machines?
A. Low
B. Medium
C. High
D. Any of the above
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impose limitation on design____________?
A. saturation
B. temperature rise
C. efficiency
D. power factor
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If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?
A. Drastically increased
B. Drastically reduced
C. Unaffected
D. None of the above
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Electrical machines having a power output up to about 750 W may be called__________machines?
A. Small size
B. Medium size
C. Large size
D. Any of the above
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In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?
A. Low power factor
B. High power factor
C. High over load capacity
D. Any of the above
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Which of the following is the major consideration to evolve a good design ?
A. Cost
B. Durability
C. Compliance with performance criteria as laid down in specifications
D. All of the above
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The efficiency of a machine should be as ____________ as possible to reduce the operating cost?
A. High
B. Low
C. Either of the above
D. None of the above
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Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?
A. Small size machines
B. Medium size machines
C. Large size machines
D. Any of the above
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In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?
A. Small
B. Medium
C. Large
D. Any of the above.
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Word of the Day
15 Sep
Preferential
of or involving preference or partiality; constituting a favour or privilege.
ترجیحی، رعاعیتی، ترجیح پانےوالا

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