9294 + Mcqs in Electronics and Communication Engineering Page 74 McqOptions

3651.	Which are the pending interrupts?
A.	5.5
B.	6.5
C.	7.5
D.	None
Answer» D. None

Discussion

3652.	A quantization error is an essential aspect of ADC
A.	True
B.	False
Answer» B. False

Discussion

3653.	Schmitt trigger is used for wave shaping.
A.	True
B.	False
Answer» B. False

Discussion

3654.	Fundamental mode is another name for
A.	level operation
B.	pulse operation
C.	clock operation
D.	none of these
Answer» C. clock operation

Discussion

3655.	The internal structure of PL A is similar to
A.	RAM
B.	ROM
C.	both RAM and ROM
D.	neither RAM nor ROM
Answer» E.

Discussion

3656.	Start and stop bit do not contain any information but are used in serial communication for
A.	error correction
B.	error detection
C.	synchronization
D.	slowing down the communication
Answer» D. slowing down the communication

Discussion

3657.	Data from a satellite is received in serial form (1 bit after another). If this data is coming at a 5 MHz rate and if the clock frequency is 5 MHz how long will it take to serially load a word in a 32-bit shift register?
A.	1.6ms
B.	3.2ms
C.	6.4ms
D.	12.8ms
Answer» D. 12.8ms

Discussion

3658.	The minimum number of 2 input NAND gates required to implement Boolean function A B C is A, B, C are available is
A.	2
B.	3
C.	5
D.	6
Answer» D. 6

Discussion

3659.	Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after CMA?
A.	6 AH, 1
B.	6 AH, 0
C.	59 H, 0
D.	9 H, 0
Answer» D. 9 H, 0

Discussion

3660.	Single parity check is not reliable in case of
A.	paper tape
B.	magnetic tape
C.	magnetic drum
D.	cores
Answer» D. cores

Discussion

3661.	A 0 to 6 counter consist of 3 flip-flop and a combinational circuit of 2 input gates. The combinational circuit consist of
A.	one AND gate
B.	one OR gate
C.	one AND and One OR
D.	two AND gate
Answer» E.

Discussion

3662.	A crystal is frequently used in digital circuits for timing purpose because of its
A.	low cost
B.	high frequency stability
C.	simple circuitry
D.	ability to set frequency at desired value
Answer» C. simple circuitry

Discussion

3663.	The value of program counter of 6800 at power on are after reset is
A.	000
B.	FFFE
C.	User Programmable
D.	FFFF
Answer» C. User Programmable

Discussion

3664.	Serial in-serial out shift register can be built using D flip flops.
A.	True
B.	False
Answer» B. False

Discussion

3665.	A binary ladder network D/A converter requires
A.	resistors of one value only
B.	resistors of many different values
C.	resistors of two different values
D.	none of the above
Answer» D. none of the above

Discussion

3666.	The logic operations of the two circuits given below are
A.	complementary
B.	identical
C.	entirely different
D.	none of these
Answer» D. none of these

Discussion

3667.	A register is
A.	a group is memories
B.	a group of devices that store digital data
C.	a chip used in computers
D.	a pure silica piece used in digital systems
Answer» C. a chip used in computers

Discussion

3668.	In 8085 microprocessor, when TRAP interrupt is triggered program control is transferred to location
A.	0020 H
B.	0024 H
C.	0028 H
D.	002 CH
Answer» C. 0028 H

Discussion

3669.	In 8085 microprocessor, what is the length of SP (stack) pointer?
A.	6 bits
B.	8 bits
C.	12 bits
D.	16 bits
Answer» E.

Discussion

3670.	Assertion (A): The output of an 8 bit ADC is 80 H if input is 2.5 V Reason (R): ADC has an output range of 00 to FF H if input range is - 5 to + 5 V
A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true
Answer» D. A is false, R is true

Discussion

3671.	A parity detector can detect
A.	single error only
B.	single error or odd number of errors
C.	two errors
D.	single or two errors
Answer» C. two errors

Discussion

3672.	The number of programmable 16 bit registers of 6800 are
A.	2
B.	3
C.	4
D.	5
Answer» C. 4

Discussion

3673.	"Micro-program" is
A.	the name of the source program in microcomputer
B.	the set of instructions indicating the primitive operations in 1 system
C.	the general name of 'MACRO's' in assembly language programming
D.	the name of programs of very small size
Answer» C. the general name of 'MACRO's' in assembly language programming

Discussion

3674.	The clock shown in figure has a frequency of 6 MHz. The frequency of the Q output will be
A.	12 MHz
B.	24 MHz
C.	3 MHz
D.	1.5 MHz
Answer» D. 1.5 MHz

Discussion

3675.	In floating point representation, the number of bits of mantissa is
A.	10
B.	9
C.	8
D.	7
Answer» B. 9

Discussion

3676.	In 8085 microprocessor, if interrupt service requests have been received from all of the following interrupts, then which one will be serviced first?
A.	RST 5.5
B.	RST 6.5
C.	RST 7.5
D.	None
Answer» D. None

Discussion

3677.	Which of the following can provide a digital signal?
A.	Slow change in the value of a resister
B.	Sine wave
C.	Square wave
D.	Gradual turning of a potentiometer
Answer» D. Gradual turning of a potentiometer

Discussion

3678.	Data are recorded on a 2, 400 ft reel of magnetic tape at a density of 556 characters per inch. If the record length is of 100 characters and 0.75 inch of record gap, the tape utilization factor is
A.	0.85
B.	0.67
C.	0.19
D.	0.08
Answer» D. 0.08

Discussion

3679.	Some of MOS families are PMOS, CMOS, the family dominating the LSI field, where low power consumption is necessary is
A.	NMOS
B.	CMOS
C.	PMOS
D.	both NMOS, CMOS
Answer» C. PMOS

Discussion

3680.	Which of the following binary product is incorrect?
A.	1100 x 1010 = 1111000
B.	1.01 x 10.1 = 11.001
C.	1100110 x 1000 = 1100110000
D.	None of the above
Answer» E.

Discussion

3681.	Serial input data of 8085 can be loaded into bit-7 of the accumulator by
A.	executing a RIM instruction
B.	executing RSTI
C.	using TRAP
D.	none of the above
Answer» B. executing RSTI

Discussion

3682.	The converter whose conversion time is independent of number of bits is
A.	dual stope
B.	counter type
C.	parallel conversion
D.	successive approximation
Answer» D. successive approximation

Discussion

3683.	Assertion (A): The advantages of totem pole output are fast switching and low power consumption.Reason (R): IC packages available are DIP, surface mount and J lead surface mount.
A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true
Answer» C. A is true, R is false

Discussion

3684.	In DTL the junction transistor serves as
A.	inverter
B.	buffer amplifier
C.	both (a) and (b)
D.	none of the above
Answer» D. none of the above

Discussion

3685.	Decade counter has 4 flip flops and skips states 10 to 15.
A.	True
B.	False
Answer» B. False

Discussion

3686.	Which of the following parameters is not specified for digital ICs?
A.	Gate dissipation
B.	Propagation delay
C.	Noise margin
D.	Bandwidth
Answer» E.

Discussion

3687.	A binary adder has
A.	one half adder
B.	one half adder and 2 full adders
C.	two half adders
D.	one half adder and many full adders
Answer» E.

Discussion

3688.	In floating point representation the number of bits in exponent is
A.	8
B.	7
C.	6
D.	5
Answer» D. 5

Discussion

3689.	In 8085 microprocessor, an active low signal INTA is not needed from up service which of the following interrupt request?
A.	TRAP
B.	INTR
C.	RST 7.5
D.	RST 5.5
Answer» B. INTR

Discussion

3690.	Consider the following statements: In the 2's complement representation, negative numbers are stored in sign magnitude form.Taking 2's complement is equivalent to sign change.In a 4 bit complement representation of a binary number A.In the 2's complement representation the most significant bit (MSB) is zero for a positive number. Of these, the only true statements are
A.	(I) and (III)
B.	(I) and (IV)
C.	(II) and (III)
D.	(II) and (IV)
Answer» E.

Discussion

3691.	Without any addition circuitry, an 8:1 MUX can be used to obtain.
A.	some but not all Boolean functions of 3 variables
B.	all functions of 3 variables but none of 4 variables
C.	all functions of 3 variables and some but not all of 4 variables
D.	all functions of 4 variables
Answer» C. all functions of 3 variables and some but not all of 4 variables

Discussion

3692.	When all the seven segments of a display are energized, the number shown is
A.	0
B.	1
C.	7
D.	8
Answer» E.

Discussion

3693.	In digital computer programming, subroutines are used
A.	to reduce program execution time at the expense of more memory
B.	to reduce storage requirements
C.	to increase programming ease and reduce storage requirements
D.	because most of the functions are same
Answer» D. because most of the functions are same

Discussion

3694.	A microprocessor with a 16-bit address bus is used in a linear memory selection configuration (i.e., Address bus lines are directly used as chip selects of memory chips) with 4 memory chips. The maximum addressable memory space is
A.	64 K
B.	16 K
C.	8 K
D.	4 K
Answer» B. 16 K

Discussion

3695.	The logic represented by the abbreviation ECL is
A.	Emitter Coupled Logic
B.	Electron Carrier Logic
C.	Encoding Clock Logic
D.	Electrostatic Channel Logic
Answer» B. Electron Carrier Logic

Discussion

3696.	Assertion (A): The use of 2's complement has simplified the computer hardware for arithmetic operations Reason (R): 2's complement is obtained by adding 1 to 1's complement.
A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true
Answer» C. A is true, R is false

Discussion

3697.	A (A + B) =
A.	A
B.	B
C.	<span style="text-decoration:overline;">A</span>
D.	<span style="text-decoration:overline;">B</span>
Answer» B. B

Discussion

3698.	Unlimited number of ICs 7490, 78492 and 7493 are available. Which of these could be used to build the dividse-by-60 circuit of figure
A.	7490
B.	7492
C.	combination of 7490 and 7492
D.	combination of 7492 and 7493
Answer» D. combination of 7492 and 7493

Discussion

3699.	One of the function of the Sio2 layer in an IC is to
A.	act as a dielectric for capacitors
B.	prevent shorting of elements by interconnections
C.	from cathodes for diodes
D.	afford protection from the radiations
Answer» C. from cathodes for diodes

Discussion

3700.	Consider the following statements Timer 555 can be used as monostable multivibratorbistable multivibratorastable multivibrator Which of the above statements are correct?
A.	1 and 2
B.	1 and 3
C.	2 and 3
D.	1, 2, 3
Answer» C. 2 and 3

Discussion

Explore topic-wise MCQs in Engineering.

Which are the pending interrupts?

A quantization error is an essential aspect of ADC

Schmitt trigger is used for wave shaping.

Fundamental mode is another name for

The internal structure of PL A is similar to

Start and stop bit do not contain any information but are used in serial communication for

Data from a satellite is received in serial form (1 bit after another). If this data is coming at a 5 MHz rate and if the clock frequency is 5 MHz how long will it take to serially load a word in a 32-bit shift register?

The minimum number of 2 input NAND gates required to implement Boolean function A B C is A, B, C are available is

Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after CMA?

Single parity check is not reliable in case of

A 0 to 6 counter consist of 3 flip-flop and a combinational circuit of 2 input gates. The combinational circuit consist of

A crystal is frequently used in digital circuits for timing purpose because of its

The value of program counter of 6800 at power on are after reset is

Serial in-serial out shift register can be built using D flip flops.

A binary ladder network D/A converter requires

The logic operations of the two circuits given below are

A register is

In 8085 microprocessor, when TRAP interrupt is triggered program control is transferred to location

In 8085 microprocessor, what is the length of SP (stack) pointer?

Assertion (A): The output of an 8 bit ADC is 80 H if input is 2.5 V Reason (R): ADC has an output range of 00 to FF H if input range is - 5 to + 5 V

A parity detector can detect

The number of programmable 16 bit registers of 6800 are

"Micro-program" is

The clock shown in figure has a frequency of 6 MHz. The frequency of the Q output will be

In floating point representation, the number of bits of mantissa is

In 8085 microprocessor, if interrupt service requests have been received from all of the following interrupts, then which one will be serviced first?

Which of the following can provide a digital signal?

Data are recorded on a 2, 400 ft reel of magnetic tape at a density of 556 characters per inch. If the record length is of 100 characters and 0.75 inch of record gap, the tape utilization factor is

Some of MOS families are PMOS, CMOS, the family dominating the LSI field, where low power consumption is necessary is

Which of the following binary product is incorrect?

Serial input data of 8085 can be loaded into bit-7 of the accumulator by

The converter whose conversion time is independent of number of bits is

Assertion (A): The advantages of totem pole output are fast switching and low power consumption.Reason (R): IC packages available are DIP, surface mount and J lead surface mount.

In DTL the junction transistor serves as

Decade counter has 4 flip flops and skips states 10 to 15.

Which of the following parameters is not specified for digital ICs?

A binary adder has

In floating point representation the number of bits in exponent is

In 8085 microprocessor, an active low signal INTA is not needed from up service which of the following interrupt request?

Without any addition circuitry, an 8:1 MUX can be used to obtain.

When all the seven segments of a display are energized, the number shown is

In digital computer programming, subroutines are used

A microprocessor with a 16-bit address bus is used in a linear memory selection configuration (i.e., Address bus lines are directly used as chip selects of memory chips) with 4 memory chips. The maximum addressable memory space is

The logic represented by the abbreviation ECL is

Assertion (A): The use of 2's complement has simplified the computer hardware for arithmetic operations Reason (R): 2's complement is obtained by adding 1 to 1's complement.

A (A + B) =

Unlimited number of ICs 7490, 78492 and 7493 are available. Which of these could be used to build the dividse-by-60 circuit of figure

One of the function of the Sio2 layer in an IC is to

Consider the following statements Timer 555 can be used as monostable multivibratorbistable multivibratorastable multivibrator Which of the above statements are correct?