Electronics and Communication Engineering (ECE)
The Antenna current of an AM transmitter is 9A, when only the carrier is sent. But it increases to 9.36A when the carrier is modulated by a single sine wave. Then the percentage of modulation is- a)70.1%
- b)40.4%
- c)89.8%
- d)20.6%
Correct answer is option 'B'. Can you explain this answer?
The Antenna current of an AM transmitter is 9A, when only the carrier is sent. But it increases to 9.36A when the carrier is modulated by a single sine wave. Then the percentage of modulation is
a)
70.1%
b)
40.4%
c)
89.8%
d)
20.6%
Ratnesh Yadav answered • 2 hours ago
P. An 8-bit wide 4-word sequential memory will have
Q. A 256 x 4 EPROM has
1. 8 fixed AND gates and 4 programmable OR gates
2. Eight, 4 bit shift registers
3. 4 words of 32 bits each
4. 8 address pins and 4 data pins output
- a)A
- b)B
- c)C
- d)D
Correct answer is option 'D'. Can you explain this answer?
P. An 8-bit wide 4-word sequential memory will have
Q. A 256 x 4 EPROM has
1. 8 fixed AND gates and 4 programmable OR gates
2. Eight, 4 bit shift registers
3. 4 words of 32 bits each
4. 8 address pins and 4 data pins output
Q. A 256 x 4 EPROM has
1. 8 fixed AND gates and 4 programmable OR gates
2. Eight, 4 bit shift registers
3. 4 words of 32 bits each
4. 8 address pins and 4 data pins output
a)
A
b)
B
c)
C
d)
D
Subhashi Dahal answered • 2 hours ago
Pushkar Malik asked • 4 hours agoAn air filled rectangular waveguide with dimension 
where b < a < 2b is to be constructed to operate at 3GHz in dominant mode. The design frequency is at least 20% higher than the cut-off frequency of dominant mode and also at least 20% below, cut off frequency of next higher mode, determine the phase velocity. - a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
where b < a < 2b is to be constructed to operate at 3GHz in dominant mode. The design frequency is at least 20% higher than the cut-off frequency of dominant mode and also at least 20% below, cut off frequency of next higher mode, determine the phase velocity. a)
b)
c)
d)
Saryu Bakshi asked • 4 hours agoX is a binary memory less source with P(x=0) = 0.3. This source is transmitted over a binary symmetric channel with crossover probability P = 0.1. Assume that the source is directly connected to the channel, i.e. no coding is employed. Then the error probability at the destination is- a)0.2
- b)0.3
- c)0.6
- d)0.1
Correct answer is option 'D'. Can you explain this answer?
a)
0.2
b)
0.3
c)
0.6
d)
0.1
.
for real x. From among the following, choose the Taylor series approximation of f(x) around x = 0, which included all powers of x less than or equal to 3.
The interrupt pin TRAP of a 8085 microprocessor is- a)edge triggered
- b)level triggered
- c)both edge and level triggered
- d)neither edge nor level triggered
Correct answer is option 'C'. Can you explain this answer?
The interrupt pin TRAP of a 8085 microprocessor is
a)
edge triggered
b)
level triggered
c)
both edge and level triggered
d)
neither edge nor level triggered
Shivani Sharma answered • 2 hours agoTRAP is an interrupt in 8085 microprocessor which is both edge and level triggered.
i1 , i2 = ?
- a)2.6 A, 1.4 A
- b)2.6 A, -1.4 A
- c)1.6 A, 1.35 A
- d)1.2 A, -1.35 A
Correct answer is option 'D'. Can you explain this answer?
i1 , i2 = ?
a)
2.6 A, 1.4 A
b)
2.6 A, -1.4 A
c)
1.6 A, 1.35 A
d)
1.2 A, -1.35 A
Kulwantkaur answered • 2 hours agoix = i1 - i2
15 = 4i1 -2(i1 - i2) + 6(i1 - i2)
⇒ 8i1 - 4i2 = 15 ..........(i)
-18 = 2i2 + 6(i2 -i1)
⇒ 3i1 -4i2 = 9 ..........(ii)
i1 =1.2 A, i2 = -1.35 A
15 = 4i1 -2(i1 - i2) + 6(i1 - i2)
⇒ 8i1 - 4i2 = 15 ..........(i)
-18 = 2i2 + 6(i2 -i1)
⇒ 3i1 -4i2 = 9 ..........(ii)
i1 =1.2 A, i2 = -1.35 A
Two lamps each of 230V and 60W rating are connected in series across a single phase 230V supply. The total power consumed by the two lamps would be- a)120 W
- b)60 W
- c)30 W
- d)15 W
Correct answer is option 'C'. Can you explain this answer?
Two lamps each of 230V and 60W rating are connected in series across a single phase 230V supply. The total power consumed by the two lamps would be
a)
120 W
b)
60 W
c)
30 W
d)
15 W
Rajni answered • 2 hours ago
Resistance of each lamp
Hence Total resistance offered by 2 these lamps
So total power consumed by two lamps
When two non - linear systems S1 and S2 are connected in cascade the overall system is- a)non - linear.
- b)linear.
- c)neither linear nor non linear.
- d)non - linear but stable.
Correct answer is option 'B'. Can you explain this answer?
When two non - linear systems S1 and S2 are connected in cascade the overall system is
a)
non - linear.
b)
linear.
c)
neither linear nor non linear.
d)
non - linear but stable.
Manish Rathi answered • 13 hours ago
Y(t) - Si * S2 = linear
Exponential of any signal as non - linear
logarithm of any signal is non - linear
When two linear systems are connected in cascaded the
system is non - linear
Sim tarty two non linear systems are connected in cascaded then the system is linear
Exponential of any signal as non - linear
logarithm of any signal is non - linear
When two linear systems are connected in cascaded the
system is non - linear
Sim tarty two non linear systems are connected in cascaded then the system is linear
Tanya Satija asked • 9 hours agoReady signal is used to- a)synchronize fast peripherals with microprocessor
- b)synchronize slow peripherals with microprocessor
- c)send request to microprocessor for direct memory access
- d)send request to microprocessor for interrupt subroutines
Correct answer is option 'B'. Can you explain this answer?
Ready signal is used to
a)
synchronize fast peripherals with microprocessor
b)
synchronize slow peripherals with microprocessor
c)
send request to microprocessor for direct memory access
d)
send request to microprocessor for interrupt subroutines
The admittance parameters of a two-port network shown in figure, given by Y11 = 2 mho, Y,12 = -0.5 mho, Y21 = 4.8 mho, Y22 = 1mho. The output port is terminated with a load admittance YL = 0.2 mho.
Q.The value of V2 for V1 = 10 ∠0° volts is- a)12.5 ∠180° V
- b)12.5 ∠0°V
- c)40 ∠1B0°V
- d)40 ∠0°V
Correct answer is option 'C'. Can you explain this answer?
The admittance parameters of a two-port network shown in figure, given by Y11 = 2 mho, Y,12 = -0.5 mho, Y21 = 4.8 mho, Y22 = 1mho. The output port is terminated with a load admittance YL = 0.2 mho.
Q.
The value of V2 for V1 = 10 ∠0° volts is
a)
12.5 ∠180° V
b)
12.5 ∠0°V
c)
40 ∠1B0°V
d)
40 ∠0°V
Bronica Meena answered • 13 hours ago
A fair dice is tossed two times. The probability that the second results in a value that is higher than the first toss is:- a)2/6
- b)1/2
- c)1/18
- d)5/12
Correct answer is option 'D'. Can you explain this answer?
A fair dice is tossed two times. The probability that the second results in a value that is higher than the first toss is:
a)
2/6
b)
1/2
c)
1/18
d)
5/12
Jaya Karan Surya answered • 13 hours agoIn the first toss, results can be 1, 2, 3, 4, 5
For 1, the second toss results can be 2, 3, 4, 5, 6
For 2, the second toss results can be 3, 4, 5, 6
For 3, the second toss results can be 4, 5, 6
For 4, the second toss results can be 5, 6
For 5, the second toss results can be 6
So the required probability
For 1, the second toss results can be 2, 3, 4, 5, 6
For 2, the second toss results can be 3, 4, 5, 6
For 3, the second toss results can be 4, 5, 6
For 4, the second toss results can be 5, 6
For 5, the second toss results can be 6
So the required probability
A vessel has 10 ml of a solution of milk and water containing 20% milk, x ml of milk was added to the vessel to reverse this ratio, y ml of water was then added to the vessel to reverse the ratio once again. Find x + y.- a)140
- b)150
- c)160
- d)170
Correct answer is option 'B'. Can you explain this answer?
A vessel has 10 ml of a solution of milk and water containing 20% milk, x ml of milk was added to the vessel to reverse this ratio, y ml of water was then added to the vessel to reverse the ratio once again. Find x + y.
a)
140
b)
150
c)
160
d)
170
Ratnam Sinha answered • 13 hours ago
= 1mA/V2 and V n = -V p = 1 V. Determine V0
A lossless transmission line is terminated in a load which reflects a parts of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is _____________- a)11.11
- b)11.15
- c)2.5
- d)12.02
Correct answer is option 'A'. Can you explain this answer?
A lossless transmission line is terminated in a load which reflects a parts of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is _____________
a)
11.11
b)
11.15
c)
2.5
d)
12.02
Rashola Chauahary answered • yesterday
is used as the chip select logic of a 4 K RAM in an 8085 system, then its memory ranne will he
The following message signal m(t) is given to both frequency modulator and phase modulator. If
the maximum phase deviation of both FM and PM is same, determine the Kf/Kp.
- a)4π
- b)1/8π
- c)1/4π
- d)8π
Correct answer is option 'C'. Can you explain this answer?
The following message signal m(t) is given to both frequency modulator and phase modulator. If
the maximum phase deviation of both FM and PM is same, determine the Kf/Kp.
the maximum phase deviation of both FM and PM is same, determine the Kf/Kp.
a)
4π
b)
1/8π
c)
1/4π
d)
8π
BK Deepika answered • yesterday
and maximum phase-deviation of
FM signal
FM signal
Some advantages of optical fibre cables are - small diameter
- Immunity to cross talk and EM interference
- Laser and LED modulation methods lend themselves ideally to digital operation
Which of the above are correct?- a)1 only
- b)1 and 2
- c)1, 2, 3
- d)2, 3
Correct answer is option 'C'. Can you explain this answer?
Some advantages of optical fibre cables are
- small diameter
- Immunity to cross talk and EM interference
- Laser and LED modulation methods lend themselves ideally to digital operation
a)
1 only
b)
1 and 2
c)
1, 2, 3
d)
2, 3
Diksha Arora answered • yesterdayFibre optic cables have all these advantages.
Anumala Krishna Vamsi asked • 14 hours agoA binary symmetric channel (BSC) has a transition probability of 1/8. If the
binary symbol X is such that P(X = 0) = 9/10, then the probability of error for
an optimum receiver will be Correct answer will be uploaded soon - a)a
- b)b
- c)c
- d)d
Correct answer is option 'A'. Can you explain this answer?
A binary symmetric channel (BSC) has a transition probability of 1/8. If the
binary symbol X is such that P(X = 0) = 9/10, then the probability of error for
an optimum receiver will be
binary symbol X is such that P(X = 0) = 9/10, then the probability of error for
an optimum receiver will be
Correct answer will be uploaded soon
a)
a
b)
b
c)
c
d)
d
A TV receiver has a width of 60 cm. The aspect ratio is 4/3. The required EHT supply is about- a)29 kV
- b)2.9 kV
- c)45 kV
- d)4.5 kV
Correct answer is option 'A'. Can you explain this answer?
A TV receiver has a width of 60 cm. The aspect ratio is 4/3. The required EHT supply is about
a)
29 kV
b)
2.9 kV
c)
45 kV
d)
4.5 kV
Sonali Jha answered • yesterdayEHT supply is 1 kV per diagonal inch.
Height = 60 x 
= 45 cm.
= 45 cm. Diagonal = 
.
.Which one of the following is non-resonant antenna?- a)Folded dipole
- b)Broad side array
- c)End fire array
- d)Rhombic antenna
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is non-resonant antenna?
a)
Folded dipole
b)
Broad side array
c)
End fire array
d)
Rhombic antenna
Shubhangi Kumar answered • yesterdayRhombic antenna is a non-resonant antenna capable of operating over 3 to 30 MHz range.
Vidicon and plumbicon operate on the principle of- a)photo conduction
- b)photo emission
- c)photo voltaic
- d)none of the above
Correct answer is option 'C'. Can you explain this answer?
Vidicon and plumbicon operate on the principle of
a)
photo conduction
b)
photo emission
c)
photo voltaic
d)
none of the above
Ekta Chauhan answered • yesterdayPhoto conduction uses the fact that resistivity of some materials depends on intensity of light falling on their surface.
If γ = (S0/N0)/(Si/Nm) where S0 and S1 are signal power output and signal power input and N0 and Nm are noise power output and noise power input, the value of γ for SSB-SC and DSB-SC amplitude modulated system respectively are- a)1 and 1
- b)1 and 2
- c)2 and 1
- d)0.5 and 0.5
Correct answer is option 'A'. Can you explain this answer?
If γ = (S0/N0)/(Si/Nm) where S0 and S1 are signal power output and signal power input and N0 and Nm are noise power output and noise power input, the value of γ for SSB-SC and DSB-SC amplitude modulated system respectively are
a)
1 and 1
b)
1 and 2
c)
2 and 1
d)
0.5 and 0.5
Md Shaik Junaid answered • yesterdaySSB - SC and SSB - DB have γ = 1 and are similar from noise point.
The two-level semi-random binary process is defined by X(t) = A or -Awhere (n-1)T < t < nt and the levels A and -A occur with equal probability. T is a positive constant and 
Que: The mean value E[X(t)] is- a)1/2
- b)1/4
- c)1
- d)0
Correct answer is option 'D'. Can you explain this answer?
The two-level semi-random binary process is defined by X(t) = A or -A
where (n-1)T < t < nt and the levels A and -A occur with equal probability. T is a positive constant and
Que: The mean value E[X(t)] is
a)
1/2
b)
1/4
c)
1
d)
0
Pooja Yadav answered • yesterday
Armstrong F.M. transmitter performs frequency multiplication in stages- a)to increase the overall S/N
- b)for convenience
- c)to reduce the bandwidth
- d)to find the desired value of carrier frequency with frequency deviation
Correct answer is option 'D'. Can you explain this answer?
Armstrong F.M. transmitter performs frequency multiplication in stages
a)
to increase the overall S/N
b)
for convenience
c)
to reduce the bandwidth
d)
to find the desired value of carrier frequency with frequency deviation
Lovika Chauhan answered • yesterday
where (Δf) is the frequency deviation.
The total number of pulses in a TV remote control is- a)14
- b)12
- c)10
- d)8
Correct answer is option 'A'. Can you explain this answer?
The total number of pulses in a TV remote control is
a)
14
b)
12
c)
10
d)
8
Deep Jain answered • yesterdayThe 14 pulses are preliminary pulse, start pulse, stop pulse and 11 other pulses.
Consider the Bode plot of a ufb system shown in fig.
Q. The steady state error corresponding to a rampinput is- a)0.25
- b)0.2
- c)0
- d)∞
Correct answer is option 'A'. Can you explain this answer?
Consider the Bode plot of a ufb system shown in fig.
Q. The steady state error corresponding to a rampinput is
a)
0.25
b)
0.2
c)
0
d)
∞
Tanya Satija answered • yesterdayThe Bode plot is as shown in fig.
is _________________ (ohms)
is given by 
:the phase constant β is given by
Preet Singh Negi asked • 19 hours agoA black and white television picture may be viewed as consisting of approximately 3x105 elements, each of which may occur one of 10 distinct brightness levels with equal probability. Transmission rate is 30 picture frames/ second and SNR is 30 dB. Then the minimum bandwidth required to support the transmission of the resulting video signal is MHz
Correct answer is '3'. Can you explain this answer?
A black and white television picture may be viewed as consisting of approximately 3x105 elements, each of which may occur one of 10 distinct brightness levels with equal probability. Transmission rate is 30 picture frames/ second and SNR is 30 dB. Then the minimum bandwidth required to support the transmission of the resulting video signal is MHz
Divya Rana asked • 19 hours agoAn unregulated power supply of 25 V is connected to zerer diodes and p - n diodes (cut in voltage 0.7V) as shown in figure, then the values of x and y, 7 are? 
- a)+ 8.6V, + 9.3V, + 10V
- b)-8.6V,-9.3V, +10V
- c)+11.4V, + 10.7V, +10V
- d)-11.4V,-10.7V, +10V
Correct answer is option 'C'. Can you explain this answer?
An unregulated power supply of 25 V is connected to zerer diodes and p - n diodes (cut in voltage 0.7V) as shown in figure, then the values of x and y, 7 are?
a)
+ 8.6V, + 9.3V, + 10V
b)
-8.6V,-9.3V, +10V
c)
+11.4V, + 10.7V, +10V
d)
-11.4V,-10.7V, +10V
Arpan Jain asked • 19 hours agoRead the comprehension and answer the questions that follow: Detective glories tend to glorify crime. Murderers, gangsters and crooks all kinds are described as tough, cunning and courageous individuals who know how to take care of themselves and how to get what they want. In James McCain's The Postman Always Rings twice, for instance the villain is much more a impressive character than his victim. He is casual brave smart and successful with women. It is true that he finally gets caught. But he is punished for a crime that he did not commit, so that his conviction is hardly a triumph of justice. Besides, looking back over the exciting life of the criminal, the reader might conclude that it was worth the risk.Q.The passage mention James McCain- a) as an author of detective stories
- b) as brave, smart, and successful with women
- c) as tough cunning and courageous
- d) as being more impressive than others
Correct answer is option 'A'. Can you explain this answer?
Read the comprehension and answer the questions that follow: Detective glories tend to glorify crime. Murderers, gangsters and crooks all kinds are described as tough, cunning and courageous individuals who know how to take care of themselves and how to get what they want. In James McCain's The Postman Always Rings twice, for instance the villain is much more a impressive character than his victim. He is casual brave smart and successful with women. It is true that he finally gets caught. But he is punished for a crime that he did not commit, so that his conviction is hardly a triumph of justice. Besides, looking back over the exciting life of the criminal, the reader might conclude that it was worth the risk.
Q.
The passage mention James McCain
a)
as an author of detective stories
b)
as brave, smart, and successful with women
c)
as tough cunning and courageous
d)
as being more impressive than others
is
Vandana Mamman asked • yesterdayAn npn bipolar junction transistor (BJT) is operating in the active region. If the reverse bias across the base – collector junction is increased, then- a)the effective base width increases and common – emitter current gain increases
- b)the effective base width increases and common – emitter current gain decreases
- c)the effective base width decreases and common – emitter current gain increases
- d)the effective base width decreases and common – emitter current gain decreases
Correct answer is option 'C'. Can you explain this answer?
An npn bipolar junction transistor (BJT) is operating in the active region. If the reverse bias across the base – collector junction is increased, then
a)
the effective base width increases and common – emitter current gain increases
b)
the effective base width increases and common – emitter current gain decreases
c)
the effective base width decreases and common – emitter current gain increases
d)
the effective base width decreases and common – emitter current gain decreases
Vinitha Royal asked • yesterdayMatch List-I with List-ll and select the correct answer using the codes given below the lists:
List-I
A. Immersion rod
B. Air conditioner
C. Automatic washing machine
D. Automatic control of traffic
List-ll
1. Open loop control system
2. Closed loop control system
3. Neither a closed loop nor an open loop system
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'D'. Can you explain this answer?
Match List-I with List-ll and select the correct answer using the codes given below the lists:
List-I
A. Immersion rod
B. Air conditioner
C. Automatic washing machine
D. Automatic control of traffic
List-ll
1. Open loop control system
2. Closed loop control system
3. Neither a closed loop nor an open loop system
List-I
A. Immersion rod
B. Air conditioner
C. Automatic washing machine
D. Automatic control of traffic
List-ll
1. Open loop control system
2. Closed loop control system
3. Neither a closed loop nor an open loop system
a)
a
b)
b
c)
c
d)
d
P Naishnavi asked • yesterdayThe dependence of drift velocity of electrons on electric field in a semiconductor is shown below. The semiconductor has a uniform electron concentration of 
and electronic charge 
. If a bias of 5V is applied across a 1 mm region of this semiconductor, the resulting current density in this region, in kA/cm2, is _________.
Correct answer is '1.5 to 1.7'. Can you explain this answer?
The dependence of drift velocity of electrons on electric field in a semiconductor is shown below. The semiconductor has a uniform electron concentration of and electronic charge . If a bias of 5V is applied across a 1 mm region of this semiconductor, the resulting current density in this region, in kA/cm2, is _________.
and electronic charge . If a bias of 5V is applied across a 1 mm region of this semiconductor, the resulting current density in this region, in kA/cm2, is _________. 
), that can be corrected to the output is
Piyush Kumar asked • yesterdayIn the voltage reference circuit shown in the figure, the op-amp is ideal and the transistors Q1 Q2….., Q32 are identical in all respects and have infinitely large values of common – emitter current the relation IC = IS exp ((VBE/VT), where Is is the saturation current. Assume that the voltage VP shown in the figure is 0.7 V and the thermal voltage VT = 26mV.
The output voltage Vout(in volts) is __________.
Correct answer is '1.1 to 1.2'. Can you explain this answer?
In the voltage reference circuit shown in the figure, the op-amp is ideal and the transistors Q1 Q2….., Q32 are identical in all respects and have infinitely large values of common – emitter current the relation IC = IS exp ((VBE/VT), where Is is the saturation current. Assume that the voltage VP shown in the figure is 0.7 V and the thermal voltage VT = 26mV.
The output voltage Vout(in volts) is __________.
Kunal Rauthan asked • yesterdayAssertion (A): The writing of a program in assembly language is much easier and faster as compared to the writing of program in machine language.
Reason (R): An assembly language is a low- level language- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): The writing of a program in assembly language is much easier and faster as compared to the writing of program in machine language.
Reason (R): An assembly language is a low- level language
Reason (R): An assembly language is a low- level language
a)
Both A and R are true and R is the correct explanation of A.
b)
Both A and R are true but R is not the correct explanation of A
c)
A is true but R is false
d)
A is false but R is true
Lakshmi Priya Ghildiyal asked • yesterdayAssertion (A): The emitter follower inherently exhibits 100% negative feedback.
Reason (R): The emitter follower is an example of voltage-series feedback.- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true but R is not the correct explanation of A.
- c)A is true but R is false.
- d)A is false but R is true.
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): The emitter follower inherently exhibits 100% negative feedback.
Reason (R): The emitter follower is an example of voltage-series feedback.
Reason (R): The emitter follower is an example of voltage-series feedback.
a)
Both A and R are true and R is the correct explanation of A.
b)
Both A and R are true but R is not the correct explanation of A.
c)
A is true but R is false.
d)
A is false but R is true.
Geet Naman asked • yesterdayThe frequency response of a microphone means- a)bandwidth of frequencies having output with in � 1 dB of the output at 1000 Hz
- b)bandwidth of frequencies having output with in � 3 dB of the output at 1000 Hz
- c)bandwidth of frequencies having output with in � 1 dB of the output at 500 Hz
- d)bandwidth of frequencies having output with in � 3 dB of the output at 500 Hz
Correct answer is option 'A'. Can you explain this answer?
The frequency response of a microphone means
a)
bandwidth of frequencies having output with in � 1 dB of the output at 1000 Hz
b)
bandwidth of frequencies having output with in � 3 dB of the output at 1000 Hz
c)
bandwidth of frequencies having output with in � 1 dB of the output at 500 Hz
d)
bandwidth of frequencies having output with in � 3 dB of the output at 500 Hz
Aakash Pandey asked • yesterdayAn amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27º C, the noise voltage at input of amplifier is (Boltzman constant k = 1.38 x 10-23 J/K)- a)18.2 μV
- b)182 μV
- c)16.2 μV
- d)162 μV
Correct answer is option 'A'. Can you explain this answer?
An amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27º C, the noise voltage at input of amplifier is (Boltzman constant k = 1.38 x 10-23 J/K)
a)
18.2 μV
b)
182 μV
c)
16.2 μV
d)
162 μV
Shivani Sharma asked • yesterdayThe magnetic field intensity vector of a plane wave is given by H (x, y, z, t) = 10 sin (1000t + 0.002x + 20) ay where ay denotes the unit vector in y-direction. The wave propagating with a phase velocity- a)5 x 105 rad/s
- b)50 x 105 rad/s
- c)25 x 105 rad/s
- d)150 x 105 rad/s
Correct answer is option 'A'. Can you explain this answer?
The magnetic field intensity vector of a plane wave is given by H (x, y, z, t) = 10 sin (1000t + 0.002x + 20) ay where ay denotes the unit vector in y-direction. The wave propagating with a phase velocity
a)
5 x 105 rad/s
b)
50 x 105 rad/s
c)
25 x 105 rad/s
d)
150 x 105 rad/s
Astha Jain asked • yesterdayThe tape recorders used in homes have- a)common head and common amplifier system for recording and playback
- b)different heads and amplifiers for recording and playback
- c)same head but different amplifiers for recording and playback
- d)different heads but same amplifier for recording and playback
Correct answer is option 'A'. Can you explain this answer?
The tape recorders used in homes have
a)
common head and common amplifier system for recording and playback
b)
different heads and amplifiers for recording and playback
c)
same head but different amplifiers for recording and playback
d)
different heads but same amplifier for recording and playback
Geetanjali asked • yesterdayThe advantages of class B as compared with class A operation are
1. efficiency is higher.
2. possible to obtain greater power output.
3. less distortion and noise interference.
4. negligible power loss at no input signal. Of these the statements:- a)2 and 3 are correct
- b)1,2,3 and 4 are correct
- c)1,2 and 4 are correct
- d)2,3 and 4 are correct
Correct answer is option 'C'. Can you explain this answer?
The advantages of class B as compared with class A operation are
1. efficiency is higher.
2. possible to obtain greater power output.
3. less distortion and noise interference.
4. negligible power loss at no input signal. Of these the statements:
1. efficiency is higher.
2. possible to obtain greater power output.
3. less distortion and noise interference.
4. negligible power loss at no input signal. Of these the statements:
a)
2 and 3 are correct
b)
1,2,3 and 4 are correct
c)
1,2 and 4 are correct
d)
2,3 and 4 are correct
the skin depth at a frequency of 24 GHz would be : 
Mahithaa asked • yesterdayConsider the following statements associated with data representation by 1’s and 2‘s complements:
1. The 2’s complement system requires only one arithmetic operation.
2. The 1 ’s complement system requires two arithmetic operations.
3. The 1 's complement is often used in logical manipulations for inversion operation.
4. The 2 ’s complement is used only for arithmetic applications.Which of the statements given above are correct?- a)1 , 2 , 3 and 4
- b)1 ,3 and 4
- c)2, 3 and 4
- d)1,2 and 3
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements associated with data representation by 1’s and 2‘s complements:
1. The 2’s complement system requires only one arithmetic operation.
2. The 1 ’s complement system requires two arithmetic operations.
3. The 1 's complement is often used in logical manipulations for inversion operation.
4. The 2 ’s complement is used only for arithmetic applications.
1. The 2’s complement system requires only one arithmetic operation.
2. The 1 ’s complement system requires two arithmetic operations.
3. The 1 's complement is often used in logical manipulations for inversion operation.
4. The 2 ’s complement is used only for arithmetic applications.
Which of the statements given above are correct?
a)
1 , 2 , 3 and 4
b)
1 ,3 and 4
c)
2, 3 and 4
d)
1,2 and 3
Chandan Sharma asked • 2 days agoThe concentration of minority carriers in an extrinsic semiconductor under equilibrium is- a)directly proportional to the doping concentration.
- b)inversely proportional to the doping concentration.
- c)directly proportional to the intrinsic concentration.
- d)inversely proportional to the intrinsic concentration.
Correct answer is option 'B'. Can you explain this answer?
The concentration of minority carriers in an extrinsic semiconductor under equilibrium is
a)
directly proportional to the doping concentration.
b)
inversely proportional to the doping concentration.
c)
directly proportional to the intrinsic concentration.
d)
inversely proportional to the intrinsic concentration.
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