# 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

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 =

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

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.

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