Electrical Eng. · Question Bank

Industrial Electronics

205 questions · page 7 of 11. Answer in your head first, then check the solution.

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#121
How many semiconductor layers does an SCR have?
A4
B2
C3
D5
#122
A triac is a _____ switch.
Aunidirectional
Bmechanical
Cbidirectional
Domnidirectional
#123
Which of the following is the normal way to turn on an SCR?
Aby breakover voltage
Bby appropriate anode current
Cby appropriate cathode current
Dby appropriate gate current
#124
A triac can pass a portion of _____ half-cycle through the load.
Aonly +
Bonly -
Cboth + and -
Dneither + nor -
#125
An SCR combines the features of
Aa rectifier and resistance
Ba rectifier and capacitor
Ca rectifier and transistor
Da rectifier and inductor
#126
Which is the control element in an SCR?
Aanode
Bcathode
Cgate
Dcathode supply
#127
How many semiconductor layers does a triac have?
A2
B4
C3
D1
#128
A diac has how many semiconductor layers?
A3
B4
C2
D5
#129
The p-type emitter of ac UJT is _____ doped.
Alightly
Bmoderately
Cheavily
Dnot
#130
A diac has
Aone pn junction
Bthree pn junctions
Ctwo pn junctions
Dfour pn junctions
#131
A UJT is sometimes is called _____ diode.
Adouble-based
Bsingle-based
Ca rectifier
Da switching
#132
A diac is _____ switch.
Aan ac
Ba mechanical
Ca dc
Dboth ac and dc
#133
An effect that reduces the possibility of accidental triggering of the SCS.
AMiller effect
BRate effect
CEnd effect
DFlywheel effect
#134
Which device does not have a gate terminal?
Atriac
BSCR
CFET
Ddiac
#135
An SCR is a _____ triggered device.
Acurrent
Bpower
Cvoltage
Dnoise
#136
When a UJT is turned on the resistance between emitter terminal and lower base terminal
Aremains unchanged
Bincreases
Cdecreases
Dbecomes zero
#137
A UJT has
Atwo pn junction
Bthree pn junctions
Cone pn junction
Dfour pn junctions
#138
The UJT may be used as
Aan amplifier
Ba rectifier
Ca sawtooth generator
Da multivibrator
#139
Which of the following is the normal way to turn on a diac?
Aby breakover voltage
Bby gate voltage
Cby gate current
Dby anode current
#140
Essentially, power electronics deals with the control of ac power at what frequencies?
A20kHz
B1,000 kHz
Cfrequencies less than 10 Hz
D60 Hz frequency

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