9294 + Mcqs in Electronics and Communication Engineering Page 70 McqOptions

3451.	Subroutines are used in larger programs not
A.	to increase the programming case
B.	to reduce storage equipment
C.	to reduce program extension time
D.	for ease of program testing at the program development time
Answer» E.

Discussion

3452.	In level clocking the output can change
A.	on rising edge of clock cycle
B.	on falling edge of clock cycle
C.	during entire half cycle of the clock
D.	none of the above
Answer» D. none of the above

Discussion

3453.	The digit F in hexadecimal system is equivalent to number __________ in decimal system.
A.	16
B.	15
C.	17
D.	8
Answer» C. 17

Discussion

3454.	An encoder converts decimal numbers to binary and other codes.
A.	True
B.	False
Answer» B. False

Discussion

3455.	Which family of logic circuits uses field effect transistors?
A.	TTL
B.	CMOS
C.	Both LED and well as LCD
D.	None of the above
Answer» C. Both LED and well as LCD

Discussion

3456.	When two 16-input multiplexers drive a 2-input MUX, what is the result?
A.	2-input MUX
B.	4-input MUX
C.	16-input MUX
D.	32 input MUX
Answer» E.

Discussion

3457.	Two voltages are -5 V and -10 V. In positive logic
A.	-5 V is 1 and -10 V is 0
B.	-10 V is 1 and -5 V is 0
C.	-5 V is 1 in some circuits and 0 in others
D.	-10 V is 1 in some circuits and 0 in others
Answer» B. -10 V is 1 and -5 V is 0

Discussion

3458.	In floating point number 0110100000010101, the exponent is equal to __________ 10
A.	11
B.	-11
C.	10
D.	-10
Answer» C. 10

Discussion

3459.	figure shows three pulse train inputs to a 3-input OR gate. Assuming positive logic, the output pulse rate train in figure (b) would be
A.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/57-975-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/57-975-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/57-975-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/58-975-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/58-975-4.png">

Discussion

3460.	The advantage of using dual slope ADC in digital voltmeter is that
A.	its conversion time is small
B.	its accuracy is high
C.	its output is in BCD
D.	it does not require a comparator
Answer» C. its output is in BCD

Discussion

3461.	Equipment using BCD numbers
A.	pocket calculators
B.	electronic counter
C.	digital voltmeters
D.	all of the above
Answer» E.

Discussion

3462.	If number of bits is N, the % resolution in analog to digital conversion is
A.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/19-190-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/19-190-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/19-190-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/19-190-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/19-190-4.png">

Discussion

3463.	In a microprocessor system the stack is used for
A.	starting the program return address whenever a subroutine jump instruction is execute
B.	transmitting and receiving input and output data
C.	starting all important CPU register contents whenever an interrupt is to be serviced
D.	storing program instructions for interrupt service routine
Answer» B. transmitting and receiving input and output data

Discussion

3464.	A full adder has two outputs SUM and CARRY.
A.	True
B.	False
Answer» B. False

Discussion

3465.	For the circuit shown in the figure, what is the frequency of the output Q?
A.	Twice the input clock frequency
B.	Half the input clock frequency
C.	Same as input clock frequency
D.	Inverse of the propagation delay of the FF
Answer» C. Same as input clock frequency

Discussion

3466.	Which two rows represent identical binary numbers?
A.	A second and fourth
B.	Fifth and eight
C.	Third and seventh
D.	Second and third
Answer» E.

Discussion

3467.	How many input-output ports can be accessed by direct method of 8085 p?
A.	8
B.	256
C.	32 K
D.	64 K
Answer» C. 32 K

Discussion

3468.	Assertion (A): An SR latch has the problem of RAC conditionReason (R): While designing a digital circuit RAC condition should be avoided.
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

3469.	The binary equivalent of 4096.90625 is
A.	1000000000000.11101
B.	10000000000001.10101
C.	1000000000001.10001
D.	1000000000000.10011
Answer» B. 10000000000001.10101

Discussion

3470.	For the network of figure, z11 =
A.	5/3 &ohm;
B.	3/2 &ohm;
C.	2 &ohm;
D.	2/3 &ohm;
Answer» B. 3/2 &ohm;

Discussion

3471.	In figure
A.	Wave A is lagging wave B by
B.	Wave A is leading wave B by
C.	Wave A is lagging wave B by and the two waves have same rms values
D.	Wave A is lagging wave B by and the two waves have different rms values
Answer» C. Wave A is lagging wave B by and the two waves have same rms values

Discussion

3472.	The units for apparent power are watts.
A.	True
B.	False
Answer» C.

Discussion

3473.	An RLC series circuit has Q = 100 and 0 = 20 rad/sec. The bandwidth is
A.	0.2 rad/sec
B.	2 rad/sec
C.	20 rad/sec
D.	2000 rad/sec
Answer» B. 2 rad/sec

Discussion

3474.	In a series RLC circuit the phase angle of impedance Z is positive. The circuit will behave as
A.	resistive circuit
B.	RC circuit
C.	RL circuit
D.	either RL or RC circuit
Answer» C. RL circuit

Discussion

3475.	Thevenin's impedance of an ac network is in general
A.	resistance
B.	R and L in series
C.	R and C in series
D.	Either R and L or R and C in series
Answer» E.

Discussion

3476.	A system is at rest for t < 0. It is given by If steady state is reached at t = 0, then the value of angle A is given by
A.	0
B.	45
C.	- 45
D.
Answer» C. - 45

Discussion

3477.	In the circuit of figure the current through C at t = is
A.	4 A
B.	2.5 A
C.	3.1 A
D.	0
Answer» E.

Discussion

3478.	The average value of the waveform is
A.	2 V
B.	0 V
C.	4 V
D.	3 V
Answer» C. 4 V

Discussion

3479.	Assertion (A): is positive real.Reason (R): For a positive real function Re[H(j )] 0 for 0 .
A.	Both A and R are true and R is correct explanation of A
B.	Both A and R are true and R is not the correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» E.

Discussion

3480.	The Voltage e0 in the figure,
A.	2 V
B.	4 V
C.	4/3 V
D.	8 V
Answer» C. 4/3 V

Discussion

3481.	A constant k band pass filter has a pass band from 100 to 400 Hz. The resonant frequency of series and shunt arms is
A.	3000 Hz
B.	2500 Hz
C.	2000 Hz
D.	1500 Hz
Answer» D. 1500 Hz

Discussion

3482.	Two similar coupled coils are connected in series. The total inductance in series aiding connection is 100 mH. If currents is 3 A, the energy stored in magnetic field is
A.	0.9 J
B.	0.45 J
C.	0.225 J
D.	1.8 J
Answer» D. 1.8 J

Discussion

3483.	A two branch tuned circuit has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. If R is increased, the dynamic resistance
A.	increases
B.	decreases
C.	remains constant
D.	may increases or decreases
Answer» C. remains constant

Discussion

3484.	In figure, the capacitor is charged to 1 V. At t = 0 the switch is closed so that i = e-t. When i = 0.37 A, the voltage across capacitor is
A.	1 V
B.	0.63 V
C.	0.37 V
D.	0.185 V
Answer» D. 0.185 V

Discussion

3485.	In a series RLC circuit p.f is lagging when f < resonance frequency.
A.	True
B.	False
Answer» C.

Discussion

3486.	In the given circuit, viewed from AB, the circuit can be reduced to an equivalent circuit as
A.	5 volts source in series with 10 &ohm; resistor
B.	7 volts source in series with 2.4 &ohm; resistor
C.	15 volts source in series with 2.4 &ohm; resistor
D.	1 volt source in series with 10 &ohm; resistor
Answer» C. 15 volts source in series with 2.4 &ohm; resistor

Discussion

3487.	For the network of figure KVL for first loop is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/107-450-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/107-450-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/107-450-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/107-450-5.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/107-450-5.png">

Discussion

3488.	An RC series circuit is charged by a voltage E. After a long time the battery is removed and a short circuit is placed across R-C. Then
A.	the polarity of voltage across R is same during discharge and during charge
B.	the polarity of voltage across R during discharging is opposite to that during charging
C.	the polarity of voltage across R depends on time constant RC
D.	none of the above
Answer» C. the polarity of voltage across R depends on time constant RC

Discussion

3489.	Two coils having self inductances of 10 mH and 40 mH are mutually coupled. The maximum possible mutual inductance is
A.	40 mH
B.	20 mH
C.	10 mH
D.	5 mH
Answer» C. 10 mH

Discussion

3490.	In the circuit shown in figure the current I of sinusoidal source is
A.	25 A
B.	4 A
C.	20 A
D.	Not determinable from given data
Answer» D. Not determinable from given data

Discussion

3491.	A two branch parallel tuned circuit has a coil of resistance 100 &ohm; and inductance 0.005 H in one branch and 10 nF capacitor in the second branch. At resonance frequency is
A.	100 rad/sec
B.	10000 rad/sec
C.	1000 rad/sec
D.	more than 10000 rad/sec
Answer» D. more than 10000 rad/sec

Discussion

3492.	An ideal transformer has a turn ratio of 2 : 1. Taking hv side as port 1 and lv side as port 2, transmission parameters of transformer are
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/121-680-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/121-680-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/121-680-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/121-680-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/121-680-4.png">

Discussion

3493.	A circuit is replaced by its Thevenin's equivalent to find current through a certain branch. If VTH = 10 V and RTH = 20 &ohm;, the current through the branch
A.	will always be 0.5 A
B.	will always be less than 0.5 A
C.	will always be equal to or less than 0.5 A
D.	may be 0.5 A or more or less
Answer» D. may be 0.5 A or more or less

Discussion

3494.	The voltage e0 in the figure
A.	48 V
B.	24 V
C.	36 V
D.	28 V
Answer» E.

Discussion

3495.	A capacitor used for power factor correction is single phase circuit decreases
A.	power factor
B.	line current
C.	both line current and p.f.
D.	the line current and increases p.f.
Answer» E.

Discussion

3496.	Evaluate the value of 2 [u (t - 1) - u (1 - 2t)] (u ( t + 1) + u (t)) at t = 3 sec.
A.	0
B.	4
C.
D.	1
Answer» C.

Discussion

3497.	Assertion (A): In an R-L circuit having high inductance, the rise of current is very slow.Reason (R): The time constant of R-L circuit is L/R.
A.	Both A and R are true and R is correct explanation of A
B.	Both A and R are true and R is not the correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» B. Both A and R are true and R is not the correct explanation of A

Discussion

3498.	An air cored coil has an inductance of 0.3 H. If another coil has an iron core of r = 500, the remaining quantities being the same, the inductance of the second coil will be
A.	0.3 H
B.	0.3 x 500 H
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/89-63-1.png">
D.	none of the above
Answer» E.

Discussion

3499.	Poles and zeros of a driving point function of a network are simple and alternate on j axis. The network consists of
A.	R and C
B.	L and C
C.	R and L
D.	R, L and C
Answer» C. R and L

Discussion

3500.	Heat in calories = I2Rt/4.186.
A.	True
B.	False
Answer» B. False

Discussion

Explore topic-wise MCQs in Engineering.

Subroutines are used in larger programs not

In level clocking the output can change

The digit F in hexadecimal system is equivalent to number __________ in decimal system.

An encoder converts decimal numbers to binary and other codes.

Which family of logic circuits uses field effect transistors?

When two 16-input multiplexers drive a 2-input MUX, what is the result?

Two voltages are -5 V and -10 V. In positive logic

In floating point number 0110100000010101, the exponent is equal to __________ 10

figure shows three pulse train inputs to a 3-input OR gate. Assuming positive logic, the output pulse rate train in figure (b) would be

The advantage of using dual slope ADC in digital voltmeter is that

Equipment using BCD numbers

If number of bits is N, the % resolution in analog to digital conversion is

In a microprocessor system the stack is used for

A full adder has two outputs SUM and CARRY.

For the circuit shown in the figure, what is the frequency of the output Q?

Which two rows represent identical binary numbers?

How many input-output ports can be accessed by direct method of 8085 p?

Assertion (A): An SR latch has the problem of RAC conditionReason (R): While designing a digital circuit RAC condition should be avoided.

The binary equivalent of 4096.90625 is

For the network of figure, z11 =

In figure

The units for apparent power are watts.

An RLC series circuit has Q = 100 and 0 = 20 rad/sec. The bandwidth is

In a series RLC circuit the phase angle of impedance Z is positive. The circuit will behave as

Thevenin's impedance of an ac network is in general

A system is at rest for t &lt; 0. It is given by If steady state is reached at t = 0, then the value of angle A is given by

In the circuit of figure the current through C at t = is

The average value of the waveform is

Assertion (A): is positive real.Reason (R): For a positive real function Re[H(j )] 0 for 0 .

The Voltage e0 in the figure,

A constant k band pass filter has a pass band from 100 to 400 Hz. The resonant frequency of series and shunt arms is

Two similar coupled coils are connected in series. The total inductance in series aiding connection is 100 mH. If currents is 3 A, the energy stored in magnetic field is

A two branch tuned circuit has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. If R is increased, the dynamic resistance

In figure, the capacitor is charged to 1 V. At t = 0 the switch is closed so that i = e-t. When i = 0.37 A, the voltage across capacitor is

In a series RLC circuit p.f is lagging when f &lt; resonance frequency.

In the given circuit, viewed from AB, the circuit can be reduced to an equivalent circuit as

For the network of figure KVL for first loop is

An RC series circuit is charged by a voltage E. After a long time the battery is removed and a short circuit is placed across R-C. Then

Two coils having self inductances of 10 mH and 40 mH are mutually coupled. The maximum possible mutual inductance is

In the circuit shown in figure the current I of sinusoidal source is

A two branch parallel tuned circuit has a coil of resistance 100 &amp;ohm; and inductance 0.005 H in one branch and 10 nF capacitor in the second branch. At resonance frequency is

An ideal transformer has a turn ratio of 2 : 1. Taking hv side as port 1 and lv side as port 2, transmission parameters of transformer are

A circuit is replaced by its Thevenin's equivalent to find current through a certain branch. If VTH = 10 V and RTH = 20 &amp;ohm;, the current through the branch

The voltage e0 in the figure

A capacitor used for power factor correction is single phase circuit decreases

Evaluate the value of 2 [u (t - 1) - u (1 - 2t)] (u ( t + 1) + u (t)) at t = 3 sec.

Assertion (A): In an R-L circuit having high inductance, the rise of current is very slow.Reason (R): The time constant of R-L circuit is L/R.

An air cored coil has an inductance of 0.3 H. If another coil has an iron core of r = 500, the remaining quantities being the same, the inductance of the second coil will be

Poles and zeros of a driving point function of a network are simple and alternate on j axis. The network consists of

Heat in calories = I2Rt/4.186.

A system is at rest for t < 0. It is given by If steady state is reached at t = 0, then the value of angle A is given by

In a series RLC circuit p.f is lagging when f < resonance frequency.

A two branch parallel tuned circuit has a coil of resistance 100 &ohm; and inductance 0.005 H in one branch and 10 nF capacitor in the second branch. At resonance frequency is

A circuit is replaced by its Thevenin's equivalent to find current through a certain branch. If VTH = 10 V and RTH = 20 &ohm;, the current through the branch