2291 + Mcqs in Digital Electronics Page 32 McqOptions

1551.	910 represented in eight-bit two's-complement notation is ________.
A.	11110111
B.	11111001
C.	11110110
D.	01111101
Answer» B. 11111001

Discussion

1552.	The OR gate performs like two switches wired in a series.
A.	True
B.	False
Answer» C.

Discussion

1553.	The carry-out of a full adder is ________.
A.	<img src="/_files/images/digital-electronics/digital-systems/fba6_1020a1.gif">
B.	<img src="/_files/images/digital-electronics/digital-systems/fba6_1020b1.gif">
C.	<img src="/_files/images/digital-electronics/digital-systems/fba6_1020c1.gif">
D.	<img src="/_files/images/digital-electronics/digital-systems/fba6_1020d1.gif">
Answer» E.

Discussion

1554.	In BCD addition, the value ________ is added to any invalid code group.
A.	010101
B.	0U812
C.	100110
D.	0110
Answer» E.

Discussion

1555.	FC48 AB91 = ________.
A.	5B77
B.	5267
C.	50B7
D.	5077
Answer» D. 5077

Discussion

1556.	The expressions, , are equivalent.
A.	True
B.	False
Answer» B. False

Discussion

1557.	The output of a NAND gate is the inverse of the output for an AND gate for all possible input combinations.
A.	True
B.	False
Answer» B. False

Discussion

1558.	A minimum of three universal NOR gates would be required to perform the logical operation of a 2-input AND gate.
A.	True
B.	False
Answer» B. False

Discussion

1559.	The Boolean expression for a three-input AND gate is X = ABC.
A.	True
B.	False
Answer» B. False

Discussion

1560.	Output logic levels for certain input conditions of a logic circuit may often be determined without using the Boolean expression.
A.	True
B.	False
Answer» B. False

Discussion

1561.	The effect of an inverted output being connected to the inverting input of another gate is to effectively eliminate one of the inversions, resulting in a single inversion.
A.	True
B.	False
Answer» C.

Discussion

1562.	VHDL is not a new language.
A.	True
B.	False
Answer» B. False

Discussion

1563.	The comments in ADHL are enclosed between # characters.
A.	True
B.	False
Answer» C.

Discussion

1564.	The truth table shown below describes the operation of a NOR gate.
A.	True
B.	False
Answer» C.

Discussion

1565.	A two-input NAND gate has inputs of 1 and 0; the output is 0.
A.	True
B.	False
Answer» C.

Discussion

1566.	In an expression containing both AND and OR operations, the AND operations are performed first (unless parentheses indicate otherwise).
A.	True
B.	False
Answer» B. False

Discussion

1567.	In a text-based language, the circuit being described must be given a name.
A.	True
B.	False
Answer» B. False

Discussion

1568.	The circuit shown is a(n) ________.
A.	multiplexer
B.	adder
C.	comparator
D.	converter
Answer» C. comparator

Discussion

1569.	The timing diagram for a two-input NAND gate is shown below. The gate is working correctly.
A.	True
B.	False
Answer» B. False

Discussion

1570.	In VHDL, local signals are declared in the VARIABLE section, which is placed between the SUBDESIGN section and the logic section.
A.	True
B.	False
Answer» C.

Discussion

1571.	In AHDL macrofunctions, the first thing that should go into any source file is ________ your code.
A.	a field of comments that documents
B.	a library of
C.	a function name of
D.	the universal global definition of
Answer» B. a library of

Discussion

1572.	The given figure shows the correct logic implementation of the distributive law.
A.	True
B.	False
Answer» B. False

Discussion

1573.	Boolean algebra was first applied to the analysis of digital circuits by Claude Shannon at Stanford University.
A.	True
B.	False
Answer» C.

Discussion

1574.	The application of DeMorgan's theorems to a Boolean expression with double and single inversions produces a resultant expression that contains only single inverter signs over single variables.
A.	True
B.	False
Answer» B. False

Discussion

1575.	The commutative law of Boolean addition states that A + B = A B.
A.	True
B.	False
Answer» C.

Discussion

1576.	The figure given below is an example of the implementation of AND-OR-INVERT logic.
A.	True
B.	False
Answer» C.

Discussion

1577.	Solve this binary problem: 1001 1100 = ________.
A.	01110001
B.	01111000
C.	01101100
D.	01101110
Answer» D. 01101110

Discussion

1578.	If [A] = 10 and [B] = 01, then [A] + [B] = [ ].
A.	True
B.	False
Answer» C.

Discussion

1579.	34FC + AD31 = ________.
A.	E22D
B.	E31D
C.	E21D
D.	E42D
Answer» B. E31D

Discussion

1580.	A four-bit adder can perform ________.
A.	addition
B.	subtraction
C.	logical AND
D.	All of the above
Answer» B. subtraction

Discussion

1581.	The concurrent section of the hardware description is where the ________ are interconnected.
A.	functions
B.	components
C.	circuits
D.	macrofunctions
Answer» C. circuits

Discussion

1582.	The contents of the A register after is ________.
A.	0000
B.	0001
C.	1001
D.	1010
Answer» E.

Discussion

1583.	The look-ahead-carry adder is slower than the ripple-carry adder because it requires additional logic circuits.
A.	True
B.	False
Answer» C.

Discussion

1584.	The solution to the binary problem 1011 0110 is 01100110.
A.	True
B.	False
Answer» C.

Discussion

1585.	A sign bit of "1" in the difference of a 2's-complement subtraction problem indicates the magnitude is negative and in true binary form.
A.	True
B.	False
Answer» C.

Discussion

1586.	Constants must be included in a package.
A.	True
B.	False
Answer» B. False

Discussion

1587.	10011100 in two's-complement notation has a decimal value of 100.
A.	True
B.	False
Answer» C.

Discussion

1588.	The power dissipation of a CMOS IC will ________.
A.	decrease with frequency
B.	increase with gate size
C.	decrease with gate size
D.	increase with frequency
Answer» E.

Discussion

1589.	When VGS = 0 on an N-channel MOSFET switch, there is no ________ between the source and the drain.
A.	voltage drop
B.	conductive channel
C.	capacitance
D.	inductance
Answer» C. capacitance

Discussion

1590.	The number of gates that can be connected to a single output without exceeding the current ratings of the gate is called ________.
A.	fan-out
B.	propagation
C.	dissipation
D.	SSI
Answer» B. propagation

Discussion

1591.	The solution to the binary problem 0101 + 1111 is 10100.
A.	True
B.	False
Answer» B. False

Discussion

1592.	ALU circuits cannot be cascaded to perform functions on more than four bits.
A.	True
B.	False
Answer» C.

Discussion

1593.	An open-collector TTL gate ________.
A.	can source current but cannot sink current
B.	can sink current but cannot source current
C.	cannot source or sink current
D.	can sink more current than a standard TTL gate
Answer» C. cannot source or sink current

Discussion

1594.	One advantage that MOSFET transistors have over bipolar transistors is ________.
A.	high input impedance
B.	higher switching speed
C.	low input impedance
D.	reduced propagation delay
Answer» B. higher switching speed

Discussion

1595.	The output current for a LOW output is called a(n) ________.
A.	sink current
B.	ground current
C.	exit current
D.	fan-out
Answer» B. ground current

Discussion

1596.	________ TTL allows three possible output states.
A.	Triswitch
B.	Triinput
C.	Tristate
D.	Trident
Answer» D. Trident

Discussion

1597.	The proliferation of small handheld consumer equipment such as digital video cameras, cellular phones, handheld computers (________), portable audio systems, and other devices has created a need for logic circuits in very small packages.
A.	HDLs
B.	GDAs
C.	PDAs
D.	TTLs
Answer» D. TTLs

Discussion

1598.	________ is ideally suited for applications using battery power or battery backup power.
A.	MOS
B.	P-MOS
C.	N-MOS
D.	CMOS
Answer» E.

Discussion

1599.	The ________ is defined as the maximum number of standard logic inputs that an output can drive reliably.
A.	fan-drive
B.	fan-out
C.	fan-in
D.	open-collector
Answer» C. fan-in

Discussion

1600.	A logic probe is placed on the output of a digital circuit and the probe lamp is dimly lit. This display indicates ________.
A.	that an open or bad logic level exists
B.	a high level output
C.	a high-frequency pulse train
D.	that the supply voltage is low
Answer» B. a high level output

Discussion

Explore topic-wise MCQs in Engineering.

910 represented in eight-bit two's-complement notation is ________.

The OR gate performs like two switches wired in a series.

The carry-out of a full adder is ________.

In BCD addition, the value ________ is added to any invalid code group.

FC48 AB91 = ________.

The expressions, , are equivalent.

The output of a NAND gate is the inverse of the output for an AND gate for all possible input combinations.

A minimum of three universal NOR gates would be required to perform the logical operation of a 2-input AND gate.

The Boolean expression for a three-input AND gate is X = ABC.

Output logic levels for certain input conditions of a logic circuit may often be determined without using the Boolean expression.

The effect of an inverted output being connected to the inverting input of another gate is to effectively eliminate one of the inversions, resulting in a single inversion.

VHDL is not a new language.

The comments in ADHL are enclosed between # characters.

The truth table shown below describes the operation of a NOR gate.

A two-input NAND gate has inputs of 1 and 0; the output is 0.

In an expression containing both AND and OR operations, the AND operations are performed first (unless parentheses indicate otherwise).

In a text-based language, the circuit being described must be given a name.

The circuit shown is a(n) ________.

The timing diagram for a two-input NAND gate is shown below. The gate is working correctly.

In VHDL, local signals are declared in the VARIABLE section, which is placed between the SUBDESIGN section and the logic section.

In AHDL macrofunctions, the first thing that should go into any source file is ________ your code.

The given figure shows the correct logic implementation of the distributive law.

Boolean algebra was first applied to the analysis of digital circuits by Claude Shannon at Stanford University.

The application of DeMorgan's theorems to a Boolean expression with double and single inversions produces a resultant expression that contains only single inverter signs over single variables.

The commutative law of Boolean addition states that A + B = A B.

The figure given below is an example of the implementation of AND-OR-INVERT logic.

Solve this binary problem: 1001 1100 = ________.

If [A] = 10 and [B] = 01, then [A] + [B] = [ ].

34FC + AD31 = ________.

A four-bit adder can perform ________.

The concurrent section of the hardware description is where the ________ are interconnected.

The contents of the A register after is ________.

The look-ahead-carry adder is slower than the ripple-carry adder because it requires additional logic circuits.

The solution to the binary problem 1011 0110 is 01100110.

A sign bit of "1" in the difference of a 2's-complement subtraction problem indicates the magnitude is negative and in true binary form.

Constants must be included in a package.

10011100 in two's-complement notation has a decimal value of 100.

The power dissipation of a CMOS IC will ________.

When VGS = 0 on an N-channel MOSFET switch, there is no ________ between the source and the drain.

The number of gates that can be connected to a single output without exceeding the current ratings of the gate is called ________.

The solution to the binary problem 0101 + 1111 is 10100.

ALU circuits cannot be cascaded to perform functions on more than four bits.

An open-collector TTL gate ________.

One advantage that MOSFET transistors have over bipolar transistors is ________.

The output current for a LOW output is called a(n) ________.

________ TTL allows three possible output states.

The proliferation of small handheld consumer equipment such as digital video cameras, cellular phones, handheld computers (________), portable audio systems, and other devices has created a need for logic circuits in very small packages.

________ is ideally suited for applications using battery power or battery backup power.

The ________ is defined as the maximum number of standard logic inputs that an output can drive reliably.

A logic probe is placed on the output of a digital circuit and the probe lamp is dimly lit. This display indicates ________.