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For the following questions answer them individually
In a full wave rectifier diode conduct for
one half cycle
full cycle
alternate half cycle
None of these
$$I_{CEO}$$ is related to $$I_{CBO}$$ by
$$I_{CEO} = (\beta + 1)I_{CBO}$$
$$I_{CEO} = I_{CBO}$$
$$I_{CEO} = a.I_{CBO}$$
If the temperature increases, the value of $$V_{BE}$$
remains the same
is increased
is decreased
In case of the CE amplifier the output voltage waveform is
in phase with input voltage waveform
always lag by $$90^\circ$$ with respect to input voltage wave form
always lagging by $$180^\circ$$ with respect to input voltage waveform
alwayslagging by $$90^\circ$$ with respect to input voltage wave form
In a synchronous motor the maximum power developed occurs at a coupling angle of
$$180^\circ$$
$$90^\circ$$
$$60^\circ$$
$$30^\circ$$
Which of the following motors will be used in electric clocks
D.C. series motor
D.C. shunt motor
A.C. synchronous motor
A.C. induction motor
The power developed by a synchronous motor will be maximum when the load angle is .........
$$45^\circ$$
$$120^\circ$$
$$0^\circ$$
In a synchronous motor, damper windings are placed on
rotor shaft
Stator frame
pole faces
In a three-phase synchronous motor, if one of the winding is short-circuited then the motor will
run at $$\frac{1}{4}$$ of synchronous speed
not start
run with excessive vibrations
rotate at less than the rated load
The magnitude of stator back e.m.f. (Eb) of a synchronous motor depends on
d.c. excitation only
load on the motor
both the speed and rotor flux
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