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Quiz 3
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Q.1
Dual converters provide
two quadrant operation
three quadrant operation
four quadrant operation
none of the mentioned
Q.2
In voltage source inverters
load voltage Vo depends on load impedance but load current Io does not depend on load impedance Z
both Vo and Io depends on Z
Io depends on Z but Vo does not depend
none of these
Q.3
In the three-phase bridge inverter, each step consists of
30°
60°
90°
will depend on firing angle
Q.4
The load voltage of a chopper can be controlled by varying the..................
duty cycle
firing angle
reactor position
extinction angle
Q.5
What are rheostats used for?
Control large amounts of heat
Vary large amounts of current
Control of a circuit's power rating
Vary a circuit's tolerance
Q.6
A single-phase semi-converter is having continuous conduction, as such each thyristor will conduct for an angle of
α
π
α+π
π-α
Q.7
In the continuous conduction mode if the firing angle of the converter is increased beyond _________ degrees the converter operates in the _______ mode.
90, rectifier
180, inverter
90, inverter
180, rectifier
Q.8
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________
Remains the same
Is decreased
Is increased
None of the above
Q.9
The series-inverter control method is a/an..........
external frequency control method
external voltage control method
internal voltage control method
none of the mentioned
Q.10
What is the duty cycle of a chopper ?
Ton/Toff
Ton/T
T/Ton
Toff x Ton
Q.11
In a half wave bridge inverter circuit, the power delivered to the load by each source is given by
2(Vs x Is)
Vs x Is
(Vs x Is)/2
None of the mentioned
Q.12
For a single phase thyristor circuit with R load & firing angle α, the conduction angle can be given by
π+α
2π+α
π-α
α
Q.13
In a UJT, the p-type emitter is ___________ doped
Lightly
Heavily
Moderately
None of the above
Q.14
What is the purpose of a resistor?
control current flow
allow current flow
prevent current flow
allow heat to build up
Q.15
Cycloconverter converts
ac voltage to dc voltage
dc voltage to dc voltage
ac voltage to ac voltage at same frequency
ac voltage at supply frequency to ac voltage at load frequency
Q.16
A PWM switching scheme is used with a three phase inverter to
reduce THD with modest filtering
minimize the load on DC side
increase the life of the batteries
reduce low order harmonics and increase high order harmonics
Q.17
A UJT has ___________.
Two pn junctions
One pn junction
Three pn junctions
None of the above
Q.18
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.19
In case of circulating current type dual converters, the reactor is inserted between
no reactor is used in case of circulating type dual converter
across the load
supply and converter
between the converters
Q.20
The ____________ region in a power diode increases its reverse voltage blocking capacity.
pn junction
drift
potential barrier
depletion layer
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