Power electronics MCQ #12
1) Avalanche breakdown is primarily dependent on the
phenomenon of
(a) doping
(b) collision
(c) recombination
(d) ionization
2) Which is the most suitable power electronics device for
high frequency switching application? (>100kHz)
(a) Microwave
transistor
(b) Schottky
diode
(c) BJT
(d) Power
MOSFET
3) Thyristor is similar as
(a) an
amplifier with large current rating.
(b) an
amplifier with higher gain.
(c) a
controlled switch.
(d) a controlled
transistor.
4) In a conducting SCR, the anode current is 10 A. If the gate current is made half, then what
will be the value of anode current?
(a) 5 A
(b) 20 A
(c) 2 A
(d) 10 A
ANSWER: | 1-b | 2-d | 3-c | 4-d |
5) If the supply voltage exceeds the break over voltage
of SCR with open GATE, then SCR will conduct. This statement is
(a) false.
(b) true for
DC only.
(c) true.
(d) true for
AC only.
6) To provide dynamic voltage regulation, Static VAR
controller are used. These controllers are primarily of
(a) thyristor
controlled capacitors.
(b) thyristor
switched inductors.
(c)
thyristor switched resistor.
(d) thyristor
controlled inductor and thyristor switched capacitor.
7) Which state is true for TRIAC.
(a) TRIAC
is a three terminal unilateral switch.
(b) TRIAC
is a two terminal bilateral switch
(c) TRIAC
is a three terminal bidirectional switch.
(d) TRIAC
is a two terminal switch.
8) UJT is known as
(a) current
controlled device.
(b) voltage
controlled device.
(c)
relaxation oscillator.
(d) none
of the above.
ANSWER: | 5-b | 6-d | 7-c | 8-b |
9) Which device can turn ON and turn OFF by gate signal?
(a) SCR
(b) SCS
(c) TRIAC
(d) UJT
10) The RMS value of half wave rectified symmetrical
square wave current of 2A is
(a) 1.41
A
(b) 1 A
(c)
1/1.41 A
(d) 1.73
A
11) The purpose of feedback transformer and diode in complementary
commutated inverter is to
(a) improve
the input power factor.
(b) absorb
more reactive power from source.
(c) improve
the power factor of the load.
(d) return
the trapped energy to source.
12) The output quality of ac voltage in a cycloconverter
is improved by
(a) decrease
in output voltage at increase frequency.
(b) decrease
in output voltage at reduced frequency.
(c) increase in output voltage at
increased frequency.
(d) increase
in output voltage at reduced frequency.
ANSWER: | 9-a | 10-a | 11-d | 12-c |
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To download this MCQ as PDF click on below link,
Power electronics MCQ PDF #12
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