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Electronics Engineering Objective Questions { Diode Circuits  }



239. 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
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240. If gate current is increased, then anode-cathode voltage at which SCR closes
A. is decreased
B. is increased
C. remains the same
D. none of the above
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241. When SCR is OFF, the current in the circuit is
A. exactly zero
B. small leakage current
C. large leakage current
D. none of the above
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242. An SCR can exercise control over of a.c. supply.
A. positive half-cycles only
B. negative half-cycles only
C. both positive and negative half-cycles
D. positive or negative half-cycles
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243. We can control a.c. power in a load by connecting
A. two SCRs in series
B. two SCRs in parallel
C. two SCRs in parallel opposition
D. none of the above
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244. When SCR starts conducting, then loses all control.
A. gate
B. cathode
C. anode
D. none of the above
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245. The values of voltage (VD) across a tunnel-diode corresponding to peak and valley currents are VP and Vv respectively. The range of tunnel-diode voltage VD kr which the slope of its I-VD characteristics is negative would be
A. VD < 0
B. N/D
C. Vp 5. VD < Vv
D. VD Vv
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