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 A  differential amplifier is invariably used in the i/p stage of all  op-amps. This is done basically to provide the op-amps with a very high 

CMMR
Bandwidth
Slew rate
Open-loop gain
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 Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be 

Square wave
Triangular wave
Parabolic wave
Sine wave
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 With a unity load p.f, the effect of armature reaction on the main field flux of an alternator is 

Distortional
Magnetising
Demagnetising
Nominal
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 Zero power factor method of an alternator is used to find its 

Efficiency
Voltage regulation
Armature resistance
Synchronous impedance
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 For a JFET, when VDS is increased beyond the pinch off voltage, the drain current 

Increases
Decreases
Remains constant
First decreases and then increases
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  Which of the following component is usually fabricated out of silicon steel ? 

Bearings
Shaft
Statorcore
None of the above
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 The spring material used in a spring control device should have the following property. 

Should be non-magnetic
Most be of low temperature co-efficient
Should have low specific resistance
Should not be subjected to fatigue
All of the above
nonoe of these
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  In the cables, sheaths are used to
 

prevent the moisture from entering the cable
provide enough strength
provide proper insulation
proper stress sistribution
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 Solid type cables are considered unreliable beyond 66 kV because 

insulation may melt due to higher temperature
skin effect dominates on the conductor
of corona loss between conductor and sheath material
there is a danger of breakdown of insulation due to the presence of voids
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  PVC stands for 

polyvinyl chloride
post varnish conductor
positive voltage conductor
polyvinyl chlorofloride
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