Related Questions

Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling
A 2 MVA
B 5 MVA
C 7.5 MVA
D 10 MVA
Natural oil cooling is used for transformers up to a rating of
A 3000 kVA
B 1000 kVA
C 500 kVA
D 250 kVA
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan
A With greater number of blades
B Of increased diameter
C Both A & B
D Neither A nor B
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
Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
A Wet bulb
B Dry bulb
C Saturation
D Dew point
The maximum number of steps in a flight should generally be restricted to
A 10
B 12
C 15
D No limit
In a shunt generator the voltage build up is generally restricted by
A speed limitation
B armature heating
C insulation restrictions
D saturation of iron
If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is
A Square
B Rectangular
C Trapezoidal
D Triangular
Use of natural draft cooling tower is practised, when the air has low
A Humidity
B Temperature
C Both A & B
D Neither A nor B
Distribution transformers are generally designed for maximum efficiency around
A 90% load
B Zero load
C 25% load
D 50% load

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