Electronic Devices - PNPN

Exercise :: PNPN - Filling the Blanks

16. 

The method(s) for turning off an SCR is (are) categorized as ________.

A. current interruption
B. forced commutation
C. both current interruption and forced commutation
D. None of the above

Answer: Option C

Explanation:

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17. 

In a programmable unijunction transistor (PUT), the ________ can be controlled through a couple of resistors and the supply voltage.

A. interbase resistance RBB
B. intrinsic stand-off ratio
C. emitter firing potential VP
D. All of the above

Answer: Option D

Explanation:

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18. 

The ________ are the terminals of an SCS.

A. anode, anode gate, cathode gate, and cathode
B. anode, cathode, cathode gate, and gate
C. anode, anode gate, cathode, and gate
D. anode, cathode, and gate

Answer: Option A

Explanation:

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19. 

The SCRs have typical turn-on times of ________ in the regeneration action.

A. 0.1 μs to 1 μs
B. 0.1 ms to 1 ms
C. 3 ms to 5 ms
D. 5 ms to 9 ms

Answer: Option A

Explanation:

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20. 

In the conduction region, the dynamic resistance of the SCR is typically ________ to ________.

A. 0.01 , 0.1
B. 1 , 10
C. 50 , 100
D. 500 , 10 k

Answer: Option A

Explanation:

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