Combinational Logic Circuits - General Question (4)

Directions to Solve

Combinational Logic Circuits - General Questions

25.

A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

A.	The output of the gate appears to be open.
B.	The dim indication on the logic probe indicates that the supply voltage is probably low.
C.	The dim indication is a result of a bad ground connection on the logic probe.
D.	The gate may be a tristate device.

Answer: Option A

Explanation:

No answer description available for this question

26.

The binary numbers A = 1100 and B = 1001 are applied to the inputs of a comparator. What are the output levels?

A.	A > B = 1, A < B = 0, A < B = 1
B.	A > B = 0, A < B = 1, A = B = 0
C.	A > B = 1, A < B = 0, A = B = 0
D.	A > B = 0, A < B = 1, A = B = 1

Answer: Option C

Explanation:

No answer description available for this question.

27.

For the device shown here, assume the D input is LOW, both S inputs are LOW, and the mcq6_01801 (1) input is LOW. What is the status of the mcq6_02101 (1) outputs?

mcq6_02200

A.	All are HIGH.
B.	All are LOW.
C.	All but are LOW.
D.	All but are HIGH.

Answer: Option D

Explanation:

No answer description available for this question

28.

Which of the following is an important feature of the sum-of-products form of expressions?

A.	All logic circuits are reduced to nothing more than simple AND and OR operations.
B.	The delay times are greatly reduced over other forms.
C.	No signal must pass through more than two gates, not including inverters.
D.	The maximum number of gates that any signal must pass through is reduced by a factor of two.

Answer: Option A

Explanation:

No answer description available for this question

29.

Which of the following expressions is in the product-of-sums form?

A.	(A + B)(C + D)
B.	(AB)(CD)
C.	AB(CD)
D.	AB + CD

Answer: Option A

Explanation:

No answer description available for this question

30.

In VHDL, macrofunctions is/are:

A.	digital circuits.
B.	analog circuits.
C.	a set of bit vectors.
D.	preprogrammed TTL devices.

Answer: Option D

Explanation:

No answer description available for this question

31.

The device shown here is most likely a ________.

mcq6_02000

A.	comparator
B.	multiplexer
C.	demultiplexer
D.	parity generator

Answer: Option C

Explanation:

No answer description available for this question

32.

Which gate is best used as a basic comparator?

A.	NOR
B.	OR
C.	Exclusive
D.	AND

Answer: Option C

Explanation:

No answer description available for this question.

Combinational Logic Circuits - General Question (4)

Combinational Logic Circuits - General Questions

Questions & Answers

Interviews

Jobs

Results

Admission

Admit Card

Answer Key