SSC Junior Engineer Electrical Online Exam 2018 CPWD/CWC/MES Electrical Engineering 22-01-2018 Morning10

91. In a full wave rectifier diode conduct for?

A) one half cycle
B) full cycle
C) alternator half cycle
D) None of these

... Answer is C)
explanation will provide soon.

92. ICEO is related to ICBO by ICEO, ICBO?

A) ICEO = (ß+1) ICBO
B) ICEO = ICBO
C) ICEO = α.ICBO
D) None of these

... Answer is A)
explanation will provide soon.

93. If the temperature increases, the value of VBE?

A) remains the same
B) is increased
C) is decreased
D) None of these

... Answer is C)
explanation will provide soon.

94. In case of the CE amplifier the output voltage waveform is CE?

A) in phase with input voltage waveform
B) always lag by 90o with respect to input voltage wave form
C) always lagging by 180o with respect to input voltage waveform
D) always lagging by 90o with respect to input voltage wave form

... Answer is C)
explanation will provide soon.

95. In a synchronous motor the maximum developed occurs at a coupling angle of?

A) 180
B) 90
C) 60
D) 30

... Answer is B)
explanation will provide soon.

96. Which of the following motors will be used in electric clocks?

A) D.C. series motor
B) D.C. shunt motor
C) A.C. synchronous motor
D) A.C. induction motor

... Answer is C)
In electric clocks, A.C. synchronous motor are used.
for this reluctance motor are used.
because reluctance motor running at synchronous speed and this is constant speed type motor.so normally in time circuit reluctance motor used.

97.The power developed by a synchronous motor will be maximum when the load angle is.....?

A) $45^0$
B) $90^0$
C) $120^0$
D) $0^0$

... Answer is B)
The power developed by a synchronous motor will be maximum when the load angle is $90^0$.

98. In a synchronous motor, damper windings are placed on?

A) rotor shaft
B) stator frame
C) pole faces
D) None of these

... Answer is C)
In a synchronous motor, damper windings are placed on pole faces
The synchronous motor has got no self -starting torque, but in mordern synchronous motor,almost any reasonable torque can be had by proper design of the damper windings (by changes in the resistance and size of the damper windings) .

99. In a three phase synchronous motor, if one of the winding is short circuited then the motor will?

A) run at 1/4 of synchronous speed
B) not start
C) run with excessive vibrations
D) rotate at less than the rated load

... Answer is C)
In a three phase synchronous motor ,if one of the winding is short circuited then the motor will run with excessive vibrations.

100. The magnitude of stator back e.m.f. (Eb) of a synchronous motor depends on?

A) d.c. excitation only
B) load on the motor
C) both the speed and rotor flux
D) None of these

... Answer is C)
stator back e.m.f. (Eb) of a synchronous motor depends on both the speed and rotor flux.





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