Digital Electronics - Signals and Switches

Exercise :: Signals and Switches - General Questions

21. 

TTL logic chips must have connections to Vcc and ground, even if all inputs and outputs are properly used and tied to valid signals.

A. True
B. False

Answer: Option A

Explanation:

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22. 

What is the output voltage Vout for the given circuit if the input voltage changes to 0 V?

A. +12 V
B. +15 V
C. +3 V
D. 0 V

Answer: Option A

Explanation:

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23. 

If the input voltage on D1 in the given figure is changed to 0 V, what is the output voltage Vout?

A. –5 V
B. 0 V
C. +5 V
D. +4.3 V

Answer: Option B

Explanation:

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24. 

An indication of cutoff in an NPN bipolar transistor is that the:

A. collector current is maximum
B. collector-to-emitter voltage equals zero
C. base-to-emitter voltage equals 0.7 V
D. collector to emitter appears to be open

Answer: Option D

Explanation:

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25. 

When an IC has two rows of parallel connecting pins, the device is referred to as a:

A. QFP
B. DIP
C. TSSOP
D. CMOS

Answer: Option B

Explanation:

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