Digital Arithmetic Operations and Circuits - General Questions (3)

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Digital Arithmetic Operations and Circuits - General Questions

17.

In VHDL, what is a GENERATE statement?

A.	The start statement of a program
B.	Not used in VHDL or ADHL
C.	A way to get the computer to generate a program from a circuit diagram
D.	A way to tell the compiler to replicate several components

Answer: Option D

Explanation:

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18.

Could the sum output of a full-adder be used as a two-bit parity generator?

A.	Yes
B.	No

Answer: Option A

Explanation:

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19.

An input to the mode pin of an arithmetic/logic unit (ALU) determines if the function will be:

A.	one's-complemented
B.	arithmetic or logic
C.	positive or negative
D.	with or without carry

Answer: Option B

Explanation:

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20.

The carry propagation delay in 4-bit full-adder circuits:

A.	is cumulative for each stage and limits the speed at which arithmetic operations are performed
B.	is normally not a consideration because the delays are usually in the nanosecond range
C.	decreases in direct ratio to the total number of full-adder stages
D.	increases in direct ratio to the total number of full-adder stages, but is not a factor in limiting the speed of arithmetic operations

Answer: Option A

Explanation:

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21.

A full-adder adds ________.

A.	two single bits and one carry bit
B.	two 2-bit binary numbers
C.	two 4-bit binary numbers
D.	two 2-bit numbers and one carry bit

Answer: Option A

Explanation:

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22.

An 8-bit register may provide storage for two's-complement codes within which decimal range?

A.	+128 to –128
B.	–128 to +127
C.	+128 to –127
D.	+127 to –127

Answer: Option B

Explanation:

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23.

Which of the statements below best describes the given figure?

mcq6_1009_2

A.	Half-carry adder; Sum = 0, Carry = 1
B.	Half-carry adder; Sum = 1, Carry = 0
C.	Full-carry adder; Sum = 1, Carry = 0
D.	Full-carry adder; Sum = 1, Carry = 1

Answer: Option A

Explanation:

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24.

What is wrong, if anything, with the circuit in the given figure based on the logic analyzer display accompanying the circuit?

mcq6_1017_1

A.	The CO terminal is shorted to ground.
B.	The S1 output is shorted to Vcc.
C.	The P1 input is not being added into the total.
D.	Nothing is wrong; the circuit is functioning correctly.

Answer: Option C

Explanation:

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Digital Arithmetic Operations and Circuits - General Questions (3)

Digital Arithmetic Operations and Circuits - General Questions

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