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For the following questions answer them individually
The circuit that would be used for 455 kHz, if amplifier is
resistance loaded
double tuned transformer
video amplifier
class C
A transistor is a combination of two p-n junction with their
p region connected together
n region connected together
n region connected to other p region
p region connected together and n region connected together
What are the ON/OFF terminals of a transistor when it is operated as a switch?
Collector to base
Collector to emitter
Base to collector
Emitter to base
If negative feedback is used in the amplifier circuit, it______.
inceases distortion
increases gain
reduces distortion
no effect on distortion
The power factor of a synchronous motor ,When the field is under-excited
leading
unity
lagging
zero
To limit the operating temperature of synchronous motor, it should have proper
current rating
voltage rating
power factor
speed
A synchronous machine with large air gap has_______.
a higher value of stability limit
a higher synchronizing power
a small value of regulation
all options are correct
synchronous motor speed
decreases as the load decreases
increases as the load increases
always remains constant
None of these
The magnitude of field flux in a 3-phase synchronous machine
varies with speed
remains constant at all loads
varies with power factor
varies with the load
In a synchronous motor, the magnitude of back e.m.f depends on______.
speed of the motor
d.c. excitation only
load on the motor
both the speed and rotor flux
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