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For the following questions answer them individually
The DC output power across a load of R ohms in a,half wave rectifier with a current flowing of peak value $$ I_m $$, is
$$\frac{(I_m^2R)}{\pi}$$
$$\left(\frac{I_m}{\pi}\right)^2 R$$
$$\frac{(I_m^2R)}{2 \pi}$$
$$\left(\frac{I_m}{2 \pi}\right)^2 R$$
The common emitter transistor circuit has
high gain
low gain
negligible gain
no gain
The circuit that provides the best stabilisation of operating point is
base resistor bias
collector feedback bias
potential divider bias
None of these
In an amplifier the maximum power transfer to the load resistance should be
as small as possible
as large as possible
equal to the value of the input resistance of the amplifier
equal to the value of the output increases
In a synchronous motor the rotor copper losses, are met by
armature input
d.c. source
motor input
supply lines
The change of D.C. excitation of a synchronous motor changes
motor speed
applied voltage of the motor
power factor
all option are correct
The advantage of stationary armature of a synchronous machine is
reducing number of slip rings on the rotor
difficulty of providing high voltage insulation on rotor
armature is associated with large power as compared to the field circuits
In which of the following motors the stator and rotor fields rotate simultaneously
Reluctance motor
Universal motor
D.C. motor
Synchronous motor
In a 3-phase synchronous motor , If the direction of its field current is reversed
the winding of the motor will burn
the motor will stop
the motor will run in the reverse direction
the motor continue to run in the same direction
The back e.m.f. of a synchronous motor depends on
speed
load
load angle
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