1.
When an SCR is turned on, the voltage across it is about ……….
A
10 V
B
1 V
C
2 V
D
Zero
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When an SCR is turned on, the voltage across it is about ……….
10 V
1 V
2 V
Zero
When an SCR is turned on, the voltage across it is about ..........
10 V
0.1 V
1V
zero
An SCR is a ……………….. triggered device
Current
Voltage as well as current
None of the above
Voltage
An SCR behaves as a ……………. switch
Bidirectional
Mechanical
None of the above
Unidirectional
AC power in a load can be controlled by connecting
Two SCRs in parallel
Two SCRs in parallel opposition
None of the above
Two SCRs in series
We can control a.c. power in a load by connecting …………
Two SCRs in parallel
Two SCRs in parallel opposition
None of the above
Two SCRs in series
An SCR has ………….. semiconductor layers
Three
Four
None of the above
Two
An SCR has …………….. pn junctions
Three
Four
None of the above
Two
An SCR is a solid state equivalent of …………….
Pentode
Gas-filled triode
Tetrode
Triode
An SCR is sometimes called …………
Diac
Unijunction transistor
Thyristor
Triac
If firing angle is increased, then the output of an SCR
Is increased
Is decreased
None of the above
Remains the same
If firing angle in an SCR circuit is increased, the output …………
Is increased
Is decreased
None of the above
Remains the same
An SCR is turned off by …………….
Reducing gate voltage to zero
Reverse biasing the gate
None of the above
Reducing anode voltage to zero
A single phase ac - dc converter is also known as
inverter
chopper
regulator
rectifier
In AC supply, an SCR can exercise control over
Negative half-cycles only
Both positive and negative half-cycles
Positive or negative half-cycles
Positive half-cycles only
An SCR can exercise control over ………. of a.c. supply
Negative half-cycles only
Both positive and negative half-cycles
Positive or negative half-cycles
Positive half-cycles only
In normal operation of an SCR, gate is ………..w.r.t. cathode
Negative
At zero potential
None of the above
Positive
An SCR is made of silicon and not germanium because silicon ………
Is mechanically strong
Has small leakage current
Is tetravalent
Is inexpensive
If gate current is increased, then anode-cathode voltage at which SCR turns ON
is increased
remains the same
none of the above
is decreased
If gate current is increased, then anode-cathode voltage at which SCR closes …………….
Is increased
Remains the same
None of the above
Is decreased