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Electrical Engineering
Silicon Controlled Rectifiers
Quiz 1
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Q.1
If gate current is increased, then anode-cathode voltage at which SCR closes ___________
Is decreased
Is increased
Remains the same
None of the above
Q.2
When SCR is OFF, the current in the circuit is ___________
Exactly zero
Small leakage current
Large leakage current
None of the above
Q.3
An SCR has ___________ pn junctions
Two
Three
Four
None of the above
Q.4
In normal operation of an SCR, gate is ___________w.r.t. cathode
Positive
Negative
At zero potential
None of the above
Q.5
The normal way to turn on a SCR is by ___________
Appropriate anode current
Appropriate gate current
None of the above
Q.6
An SCR is turned off by ___________
Reducing anode voltage to zero
Reducing gate voltage to zero
Reverse biasing the gate
None of the above
Q.7
An SCR is sometimes called ___________
Triac
Diac
Unijunction transistor
Thyristor
Q.8
An SCR has ___________ semiconductor layers
Two
Three
Four
None of the above
Q.9
An SCR behaves as a ___________ switch
Unidirectional
Bidirectional
Mechanical
None of the above
Q.10
An SCR is a solid state equivalent of ___________
Triode
Pentode
Gas-filled triode
Tetrode
Q.11
In an SCR circuit, the angle of conduction can be changed by ___________
Changing anode voltage
Changing gate voltage
Reverse biasing the gate
None of the above
Q.12
If firing angle in an SCR circuit is increased, the output ___________
Remains the same
Is increased
Is decreased
None of the above
Q.13
When an SCR is turned on, the voltage across it is about ___________
Zero
10 V
1.5 V
1 V
Q.14
The control element of an SCR is ___________
Cathode
Anode
Anode supply
Gate
Q.15
An SCR has three terminals viz ___________
Cathode, anode, gate
Anode, cathode, grid
Anode, cathode, drain
None of the above
Q.16
An SCR is made of silicon and not germanium because silicon
Is inexpensive
Is mechanically strong
Has small leakage current
Is tetravalent
Q.17
An SCR combines the features of ___________
A rectifier and resistance
A rectifier and transistor
A rectifier and capacitor
None of the above
Q.18
We can control a.c. power in a load by connecting ___________
Two SCRs in series
Two SCRs in parallel
Two SCRs in parallel opposition
None of the above
Q.19
In an SCR circuit the supply voltage is generally ___________ that of breakover voltage
Equal to
Less than
Greater than
None of the above
Q.20
An SCR is turned off when ___________
Anode current is reduced to zero
Gate voltage is reduced to zero
Gate is reverse biased
None of the above
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