1. . An SCR has three terminals viz ……………
(A) Cathode, anode, gate
(B) Anode, cathode, grid
(C) Anode, cathode, drain
(D) None of the above
2. . An SCR is sometimes called …………
(A) Triac
(B) Thyristor
(C) Unijunction transistor
(D) Diac
3. . An SCR combines the features of …………..
(A) A rectifier and transistor
(B) A rectifier and resistance
(C) A rectifier and capacitor
(D) None of the above
4. . An SCR is turned off by …………….
(A) None of the above
(B) Reducing gate voltage to zero
(C) Reverse biasing the gate
(D) Reducing anode voltage to zero
5. . In an SCR circuit, the angle of conduction can be changed by ……….
(A) Changing anode voltage
(B) Changing gate voltage
(C) Reverse biasing the gate
(D) None of the above
6. . When SCR is OFF, the current in the circuit is …………….
(A) Small leakage current
(B) Exactly zero
(C) Large leakage current
(D) None of the above
7. . The normal way to turn on a SCR is by ……………..
(A) Appropriate gate current
(B) Appropriate anode current
(C) Breakover voltage
(D) None of the above
8. . An SCR is a ……………….. triggered device
(A) Current
(B) Voltage
(C) Voltage as well as current
(D) None of the above
9. . In an SCR circuit the supply voltage is generally ……….. that of breakover voltage
(A) Equal to
(B) Less than
(C) Greater than
(D) None of the above
10. . If firing angle in an SCR circuit is increased, the output …………
(A) Remains the same
(B) Is increased
(C) Is decreased
(D) None of the above