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WorksheetsIEPLC TEST
Total questions: 25
Worksheet time: 13mins
Thyristor is a
PNPN devise
NPN device
PN device
4 terminal device
IGBT stands for
Insulated Gate Bipolar Transistor
Isolated Gate Bipolar Transistor
Insulated Gate Bi-Transistor
None of the above
Holding current is _______ than Latching Current
Higher
Lesser
Equal
Directly propotional
POWER ELECTRONICS is ---------------------
The study of a continuously variable signal
The study of digital signals and the engineering of devices
The study of technology concerned with the combined use of electronics and light.
The study of Switching electronic circuits in order to control the flow of electrical energy.
The three terminals of the IGBT are
base, emitter & collector
gate, source & drain
gate, emitter & collector
base, source & drain
The normal way to turn on a SCR is by ……………..
Breakover voltage
Appropriate anode current
Appropriate gate current
None of the these
The three terminals of the IGBT are
base, emitter & collector
gate, source & drain
gate, emitter & collector
base, source & drain
LASCR stands for
Light Activated Silicon Controlled Rectifier
Light Activated System Controlled Rectifier
Light Advanced Silicon Controlled Rectifier
Light Activated Silicon Common Rectifier
An SCR behaves as a ……………. switch
Mechanical
Bidirectional
Unidirectional
None of the above
In the normal operation of an SCR, anode is …………… w.r.t. cathode
At zero potential
Negative
Positive
None of the above
An SCR is a
four layer, four junction device
four layer, three junction device
four layer, two junction device
three layer, single junction device
The static V-I curve for the SCR is plotted for
Ia (anode current) vs Ig (gate current), Va (anode – cathode voltage) as a parameter
Ia vs Va with Ig as a parameter
Va vs Ig with Ia as a parameter
Ig vs Vg with Ia as a parameter
For an SCR in the reverse blocking mode, (practically)
leakage current does not flow
leakage current flows from anode to cathode
leakage current flows from cathode to anode
leakage current flows from gate to anode
With the anode positive with respect to the cathode & the gate circuit open, the SCR is said to be in the
reverse blocking mode
reverse conduction mode
forward blocking mode
forward conduction mode
The value of anode current required to maintain the conduction of an SCR even though the gate signal is removed is called as the
holding current
latching current
switching current
peak anode current
It is similar to two SCRs connected in parallel and in opposite directions with a common gate terminal.
Triac
Diac
SCR
IGBT
Which of the following is the schematic symbol of a Diac?
Which of the following is the schematic symbol of a Triac?
The forward breakover voltage of SCR
Increase with increase gate current
Decrease with increase in the gate current
Does not depend on the gate current
It is possible to turn off a conducting SCR by
Reducing the forward anode current below the holding current
Removing the gate drive to the SCR
Apply a negative gate voltage
Which of the following is the basic construction of a diac?
RC triggering is preferred over resistance triggering because
Provides a large value of the triggering angle
Provides accurate triggering
Causes quick triggering
Protects the device from getting damaged
The natural reversal of ac supply voltage commutates the SCR in case of
Forced commutation
Only line commutation
Only natural commutation
Both line & natural commutation
Which commutation circuit is this ?
Class A commutation
Class B commutation
Class C commutation
Class D commutation
Which commutation circuit is this ?
Class A commutation
Class E commutation
Class C commutation
Class D commutation
