Electronic Devices - PNPN

Exercise :: PNPN - Filling the Blanks

21. 

The anode gate connection can be used to turn the SCS device ________.

A. on
B. off
C. neither on nor off
D. either on or off

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

22. 

________ is (are) the element(s) of a unijunction transistor's equivalent circuit.

A. One fixed resistor
B. A variable resistor
C. A diode
D. All of the above

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

23. 

To turn on an SCS device, a ________ pulse must be applied to the anode gate terminal; to turn off the device, a ________ pulse is required.

A. positive, positive
B. negative, positive
C. positive, negative
D. negative, negative

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

24. 

In a half-wave variable-resistance phase control operation, the control cannot be extended past a ________ phase displacement.

A. 45º
B. 90º
C. 135º
D. 180º

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

25. 

________ are areas of application for SCRs.

A. Relay controls
B. Time-delay circuits
C. Motor controls
D. All of the above

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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