Digital Electronics - Logic Gates

Exercise :: Logic Gates - General Questions

31. 

What is the difference between a 7400 and a 7411 IC?

A. 7400 has two four-input NAND gates; 7411 has three three-input AND gates
B. 7400 has four two-input NAND gates; 7411 has three three-input AND gates
C. 7400 has two four-input AND gates; 7411 has three three-input NAND gates
D. 7400 has four two-input AND gates; 7411 has three three-input NAND gates

Answer: Option B

Explanation:

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32. 

Write the Boolean expression for an inverter logic gate with input C and output Y.

A. Y = C
B. Y =

Answer: Option B

Explanation:

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33. 

The output of an exclusive-OR gate is HIGH if ________.

A. all inputs are LOW
B. all inputs are HIGH
C. the inputs are unequal
D. none of the above

Answer: Option C

Explanation:

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34. 

A clock signal with a period of 1 s is applied to the input of an enable gate. The output must contain six pulses. How long must the enable pulse be active?

A. Enable must be active for 0 s.
B. Enable must be active for 3 s.
C. Enable must be active for 6 s.
D. Enable must be active for 12 s.

Answer: Option C

Explanation:

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35. 

The AND function can be used to ________ and the OR function can be used to ________ .

A. enable, disable
B. disable, enable
C. enable or disable, enable or disable
D. detect, invert

Answer: Option C

Explanation:

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