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For the following questions answer them individually
In which of the following amplifier configurations, the power gain is the largest?
Common-Emitter
Common - Collector
Common - Base
None of these
Transformer core is laminated in order to:
Decrease copper losses
Decrease entire core losses
Decrease only eddy current losses
Decrease only hysteresis losses
For increasing the range of voltmeter, one should connect a:
High value resistance in series with voltmeter
Low value resistance in series with voltmeter
High value resistance in parallel with voltmeter.
Low value resistance in parallel with voltmeter.
To conduct Sumpners test on a transformer:
Only one transformer is sufficient
Two identical transformers are needed
Two un-identical transformers are needed
At least three transformers are necessary
Unit of reactive power is:
Watt
Kilo Watt
Var
Volt ampere
Synchronous Generator is a source of:
Real Power
Reactive power
Apparent power
Both real and reactive power
In an induction motor, if the air gap is increased;
Speed will reduce
Efficiency will improve
Power factor will be lowered
Breakdown torque will reduce
A DC shunt motor is running at 1200 rpm, when excited with 220V dc. Neglecting the losses and saturation, the speed of the motor when connected to a 175 V supply is:
70 rpm
900 rpm
1050 rpm
The function of oil in a transformer is to provide:
Insulation and cooling
Protection against lighting
Protection against short circuit
Lubrication
The ratio of starting torque to running torque in a synchronous motor is:
Zero
One
Two
Infinity
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