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Quiz 4
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Q.1
The UJT may be used as ___________.
Am amplifier
A sawtooth generator
A rectifier
None of the above
Q.2
The Gate-Drain transfer capacitance of a MOSFET has large value in the ________________ region and small value in the ________________ region.
saturation, ohmic
ohmic, saturation
triode, linear
ohmic, active
Q.3
A diac has ___________ semiconductor layers
Three
Two
Four
None of the above
Q.4
The device that does not have the gate terminal is ___________.
Triac
FET
SCR
Diac
Q.5
A single phase half wave controlled converter always operates in the ________ conduction mode.
continuous
discontinuous
both (a) and (b)
none of the above
Q.6
In case of three-phase dual converter, one of the converter circuits is fired at an angle of 60°. For both the converter circuits to have equal average output voltage, what is the value of the firing angle for the other converter circuit?
60°
120°
100°
Insufficient data
Q.7
The process of commutating a SCR by applying a reverse voltage to an SCR through a previously charged capacitor is called as
capacitor commutation
forced commutation
voltage commutation
current commutation
Q.8
How does resistance affect current?
less resistance - less current
more resistance - less current
more resistance - more current
resistance does not affect current
Q.9
The normal way to turn on a diac is by ___________.
Gate current
Gate voltage
Breakover voltage
None of the above
Q.10
Circulating current flows
from load to converters
from one converter to another converter
in the whole circuit
none of the mentioned
Q.11
In non-circulating current mode dual converters, the circulating current is avoided by
connecting a series reactor
maintaining α1 + α2 = 180°
adding an extra SCR
operating only one converter
Q.12
In pulse width modulation scheme, _________ is kept constant
ton
toff
Fs
Ts
Q.13
A chopper may be thought as a
Inverted with DC input
DC equivalent of an AC transformer
Diode rectifier
DC equivalent of an induction motor
Q.14
In the principle of phase control
control is achieved by adjusting the firing angle of the devices
the load is on for some cycles and off for some cycles
control is achieved by adjusting the number of on off cycles
control cannot be achieved
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