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Worksheetsเพาเวอร์ อิเล็กทรอนิคส์
Total questions: 36
Worksheet time: 48mins
Fill in the blank . Power Electronics circuits involve______________ from one form to another using power semiconductor devices
The controlling parameter in MOSFET is the......
Which of the following statement is correct for an SCR operating in REVERSE BLOCKING MODE - practical condition
Three types of common power transistor are.....
A single-phase half-wave type diode rectifier requires __________ number of diode(s) whereas full wave type requires _________ number of diode(s)
For a certain diode based rectifier, the output voltage (average value) is given by the equation 1/2π ∫Vm sin (ωt) dωt ; where the integral (∫) runs from 0 to π. The rectifier configuration must be that of a....
With respect to the given circuit, from ωt = 0 to α, thyristors _____________ block the forward voltage.
Choppers is..................converter
AC -DC
DC-AC
AC-AC
DC-DC
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
Which device can be used in a chopper circuit?
BJT
MOSFET
GTO
ALL THE ABOVE
What is the duty cycle of a chopper ?
Ton/Toff
Ton/T
T/Ton
Toff x Ton
The load voltage of a chopper can be controlled by varying the..................
duty cycle
firing angle
reactor position
extinction angle
Choose the correct statement:
MOSFET is an uncontrolled device
MOSFET is an voltage controlled device
MOSFET is a current controlled device
MOSFET is a temperature controlled device
Which of the following terminals does NOT belong to a MOSFET.
Base
Gate
Source
Drain
SCR is a:
PNP device
NPN device
PN device
PNPN device
An SCR is a:
four layer-three junction device
three layer-two junction device
four layer-four junction device
three layer-three junction device
TRIAC can be represented by:
Two SCRs in anti-parallel
Two SCRs in parallel
Two diodes in anti-parallel
Two diodes in parallel
A DIAC can be represented by:
Two diodes in anti-parallel
Two diodes in parallel
Two SCRs in anti-parallel
Two SCRs in parallel
MOSFET is:
unipolar, voltage controlled two terminal device
unipolar, voltage controlled, three terminal device
bipolar, voltage controlled two terminal device
bipolar, voltage controlled, three terminal device
Which among the following is suited for high frequency applications:
MOSFET
JFET
SCR
TRIAC
JFET has high input impedance because
the input region is reverse biased
the input region is heavily doped
What is the full form of IGBT...?
Insulation gate bipolar transistor
Insulation gate bidirectional transistor
Insulated gate bipolar transistor
Insulated gate bidirectional transistor
Which of the following devices should be used as a switch in a low power switched mode power supply (SMPS)?
GTO
MOSFET
TRIAC
SCR
Power converters can change one form of power to another form of power using semiconductor power devices.
True
False
If holding current of a thyristor is 2 mA then latching current should be____
0.02
0.001
0.004
0.002
Diode pass ......... in one direction?
a) Voltage
b) Current
c) Both
d) None of these
The electronic devices below are unidirectional devices EXCEPT:
TRIAC
Diode
Silicone Controlled Rectifier
Power Electronics can be defined as ...........
A conversion from Alternating Current to Direct Current of Power Supply
A conversion of DC power supply to AC power supply
A conversion of AC power supply to AC power supply
A technology of converting electric power from one supply to another supply using electronic power devices.
Which is the symbol of SCR?
To switch on BJT, current must be applied into terminal ................... of BJT
Collector
Emitter
Gate
Base
