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Quiz 2
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Q.1
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region
Saturation
Negative resistance
Cut-off
None of the above
Q.2
After peak point, the UJT operates in the ___________ region.
Cut-off
Saturation
Negative resistance
None of the above
Q.3
The device that exhibits negative resistance region is ___________.
Diac
Triac
Transistor
UJT
Q.4
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.
High
Low
Extremely low
None of the above
Q.5
A UJT is sometimes called ___________ diode.
Low resistance
High resistance
Single-base
Double-base
Q.6
The four quadrant operation of dual converters can be obtained by
moving the mechanical lever
changing the firing angle value
adding inductance to the circuit
none of the mentioned
Q.7
A single phase full bridge inverter can operate in load commutation mode if load consists of
RLC overdamped
RLC critically damped
RLC underdamped
RLC undamped
Q.8
A single full converter alone can given a
two quadrant operation
three quadrant operation
four quadrant operation,
none of the mentioned
Q.9
Which device can be used in a chopper circuit?
GTO
ALL THE ABOVE
BJT
MOSFET
Q.10
Which of the following statements is correct in connection with the inverters?
VSI and CSI both require feedback diodes
only CSI require feedback diodes
GTO is used in current source inverter
only VSI requires feedback diodes
Q.11
The major advantage of using dual converters is that
it is cheaply available
no mechanical switch is required to change the mode of operation
it has better pf
its operating frequency is very high
Q.12
In AC voltage controllers the
variable ac with fixed frequency is obtained
variable ac with variable frequency is obtained
variable dc with fixed frequency is obtained
variable dc with variable frequency is obtained
Q.13
The values of duty cycle (α) lies between..........
1<α<100
0<=α<=1
0>α>-1
0<α<1
Q.14
The shape of the output voltage waveform in a single PWM is
quasi-square wave
sine wave
triangular wave
square wave
Q.15
In an inverter, if the fundamental frequency isHz, if third harmonic is eliminated, then frequencies of other components in the output voltage wave, in Hz, would be
250, 350, 500, higher frequencies
50, 250, 350, 500
50, 250, 350, 550
none of these
Q.16
The TRIAC is most sensitive in the _________ quadrants
1st & 3rd with positive gate current
1st with positive gate current & 3rd with negative gate current
3rd with positive gate current & 1rd with negative gate current
1st & 3rd with negative gate current
Q.17
All the modern AC-DC converters are using GTOs instead of SCRs because
emperature is an issue in SCRs
Switching losses are high in SCRs
GTOs have reliable commutation
GTOs are cheaply available today
Q.18
In case of TRC (Time Ratio Control), _________ is varied
firing angle
load cycle
duty cycle
load angle
Q.19
A voltage source inverter is normally employed when
source inductance is large and load inductance is small
source inductance is small and load inductance is large
both source and load inductance are large
both source and load inductance are small
Q.20
In the ___________ type of chopper, two stage conversions takes place.
AC-DC
AC link
DC link
None of the mentioned
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