Related Questions

How are the efficiencies of any heat engine (miu) and reversible heat engine (miuR) compared, when both are operating between same heat source and same heat sink?
A miu = miuR
B miu>miuR
C miu
D none of these
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in
A short-circuiting of the secondaries
B power factor of one of the transformers is leading while that of the other lagging
C transformers having higher copper losses will have negligible core losses
D loading of the transformers not in proportion to their kVA ratings
Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
A Low cost
B Wide speed range
C Stability
D High starting torque
________ need frequent starting and stopping of electric motors,
A Paper mills
B Grinding mills
C Air-conditioners
D Lifts and hoists
Which of the following motors will be used in electric clocks ?
A D.C. shunt motor
B D.C. series motor
C A.induction motor
D A.C. synchronous motor
In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable
A 25, 35
B 40, 50
C 60, 70
D 75, 85
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will
A Increase first at fast rate and then slow
B Increase first at slow rate and then fast
C Decrease continuously
D First increase, reach maximum and then decrease
The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the
A Fuel cost per unit power generated is less
B Thermal efficiency of the former is higher
C Maintenance cost of the former is less
D None of these
Power transformers should be designed to have maximum efficiency
A at one-fourth load
B at one-half load
C at or near full load
D any of the above
For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
A 1.0 to 1.2 A/mm2
B 1.5 to 2.0 A/mm2
C 2.2 to 3.2 A/mm2
D 3.2 to 4.2 A/mm2

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