Abhishek Kumar asked • 6 minutes ago

A second – order LTI system is described by the following state equations,

Where x_{1} (t) and x_{2} (t) are the two state variables and r(t) denotes the input. The output c(t) = x_{1}(t). The system is.

- a)Undamped (oscillatory)
- b)Under damped
- c)Critically damped
- d)Over damped

Correct answer is option 'D'. Can you explain this answer?

7 EH and 5 FH are XORed. The output is multiplied by 10 H. The result is

- a)2100 H
- b)0021 H
- c)0210 H
- d)2010 H

Correct answer is option 'C'. Can you explain this answer?

L Narayan Reddy answered • 56 minutes ago

7EH - 01111110

5FH - 01011111

XORed 0010 0001 21H

5FH - 01011111

XORed 0010 0001 21H

If A is a non–singular matrix and the eigen values of A are 2 , 3 , -3 then the eigen values of A^{-1} are

- a)2 , 3 , - 3
- b)1/2, 1/3, -1/3
- c)2|A|, 3|A|, -3|A|
- d)None of these

Correct answer is option 'B'. Can you explain this answer?

Leelawati answered • 57 minutes ago

If λ_{1} ,λ_{2} ,λ_{3} ....λ_{n }are the eigen values of a non–singular matrix A, then A^{-1} has the eigen values 1/λ_{1} ,1/λ_{2} ,1/λ_{3} ....1/λ_{n} Thus eigen values of A^{-1}are 1/2, 1/3, -1/3

Given the z-transforms

The limit of x[ ∞] is

- a)1
- b)2
- c)∞
- d)0

Correct answer is option 'A'. Can you explain this answer?

Bhavan Verma answered • 11 hours ago

The function has poles at z = 1,3/4. Thus final value theorem applies.

For distilled water μ = μ_{o} , ε = 81ε_{o} and σ = 2 x 10^{-3 }S/m, the ratio of conduction current density to displacement current density at 1 GHz is

- a)1.11 x 10
^{-5} - b)4.44 x 10
^{-4} - c)2.68 x 10
^{-6} - d)1.68 x 10
^{-7}

Correct answer is option 'B'. Can you explain this answer?

N Ashish answered • 11 hours ago

Pushkar Malik asked • 2 hours ago

An 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?

Nitin Kumar asked • 4 hours ago

A BJT having β = 125 is biased at a dc collector current of 1.23 mA. The values of g_{m}, r_{e} and r_{π} at the bias point are: (Assume temperature of operation = 25°C).

- a)47 mA/volt, 50 Ω, 75 kΩ
- b)50 mA/volt, 50 Ω, 50 kΩ
- c)47 mA/volt, 25 Ω, 75 kΩ
- d)47 mA/volt, 21 Ω, 2.642 kΩ

Correct answer is option 'D'. Can you explain this answer?

Divya Rana asked • 5 hours ago

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

Correct answer is option 'C'. Can you explain this answer?

Romsha Sinha asked • 5 hours ago

A Discone antenna is

- a)a combination of disk and cone in close approximity
- b)a combination of disk and cone at λ/4 spacing
- c)a combination of disk and cone far apart
- d)a combination of disk and cone at λ/2 spacing

Correct answer is option 'A'. Can you explain this answer?

Aakash Pandey asked • 6 hours ago

A control system has input r(t) and output c(t). If the input is first passed through a block

whose transfer function is a^{-2s} and then applied to the system, the modified output will be

- a)c(t — 2) u(t — 2)
- b)c(t — 2) u(t)
- c)c(t) u(t — 2)
- d)None

Correct answer is option 'A'. Can you explain this answer?

ATUL RANJAN asked • 6 hours ago

The input to a linear delta modulator having f_{a }step-size Δ = 0.628 is a sine wave with frequency f_{m} and peak amplitude E_{m}. If the sampling frequency f_{s} = 40 kHz, the combination of the sinc-wave frequency and the peak amplitude, where slope overload will take place is

- a)E
_{m}= 0.3V , f_{m}= 8KHz - b)E
_{m}= 1.5V , f_{m}= 4kHz - c)E
_{m}= 1.5 V , f_{m}= 2kHz - d)E
_{m}= 3.0V , f_{m}= 1kHZ

Correct answer is option 'B'. Can you explain this answer?

RANJAN KUMAR asked • 6 hours ago

In the circuit shown in fig, the transformers are center tapped and the diodes are connected as shown in a bridge. Between the terminals 1 and 2 an a.c. voltage source of frequency 400 Hz is connected. Another a.c. voltage of 1.0 MHz is connected between 3 and 4. The output between 5 and 6 contains components at

- a)400 Hz, 1.0 MHz, 1000.4 kHz, 999.6 kHz
- b)400 Hz, 1000.4 kHz, 999.6 kHz
- c)1 MHz, 1000.4 kHz, 999.6 kHz
- d)1000.4 kHz, 999.6 kHz

Correct answer is option 'D'. Can you explain this answer?

Chandan Sharma asked • 7 hours ago

The Q-point (V_{c} and I_{B}) for the differential amplifier shown in figure below is given by:

- a)V
_{c}= 6.6 V and I_{B}= 1.25 μA - b)V
_{c}= 7.9 V and I_{B}= 1.09 μA - c)V
_{c}= 6.6 V and I_{B}= 1.09 μA - d)V
_{c}= 7.9 V and I_{B}= 1.25 μA

Correct answer is option 'B'. Can you explain this answer?

Manjeet Verma asked • 7 hours ago

If wave form is given only for I period then

- a)an even function with half wave symmetry.
- b)An odd function with half wave symmetry.
- c)an even function with no half wave symmetry.
- d)An odd function with no half wave symmetry.

Correct answer is option 'B'. Can you explain this answer?

Pushkar Malik asked • 8 hours ago

Which one of the following is the general solution of the first order differential equation = (x + y - 1)^{2}, where x, y are real?

- a)y = 1 + x tan
^{-1}(x + c) , where c is a constant - b)y = 1 + x + tan (x + c) , where c is a constant
- c)y = 1 - x tan
^{-1}(x + c) , where c is a constant - d)y = 1 - x + tan (x + c) , where c is a constant

Correct answer is option 'D'. Can you explain this answer?

Swati Srivastava asked • 9 hours ago

A modulating signal given By x(t) = 5 sin (4π10^{3 }t - 10π cos2π10^{3} t) V is fed to a phase modulator with phase deviation constant k_{p} = 0.5rad/V. If the carrier frequency is 20 kHz, the instantaneous frequency (in kHz) at t = 0.5 ms is __________

Correct answer is '69.9 to 70.1'. Can you explain this answer?

Karne Prabha asked • 9 hours ago

Unilateral Laplace Transform is applicable for the determination of linear constant coefficient differential equations with ________

- a)Zero initial condition
- b)Non-zero initial condition
- c)Zero final condition
- d)Non-zero final condition

Correct answer is option 'B'. Can you explain this answer?

Md Shaik Junaid asked • 10 hours ago

A bag contains five balls and it is not known how many of them are white. It is observed that two balls drawn from the bag at random are white. Find the probability that ail the balls in the bag are white.

- a)0.8
- b)0.7
- c)0.5
- d)0.6

Correct answer is option 'C'. Can you explain this answer?

SASWAT KUMAR asked • 11 hours ago

An amplifier has three stages for which T_{e1} = 150 K (first stage), T_{e3} = 350 K, and T_{e3} = 600 K (output stage). Available power gain of the first stage is 10 and overall input effective noise temperature is 190 K

Que: What is the cascade's operating spot noise figure when used with a source of noise temperature Ts = 50 K

- a)1.34 dB
- b)3.96 dB
- c)6.81 dB
- d)None of the above.

Correct answer is option 'C'. Can you explain this answer?

MANVENDRA KRISHNA asked • 12 hours ago

An antenna with average noise temperature 60 K connects to a receiver through various microwave elements that can be modeled as an impedance matched attenuator with an overall loss of 2.4 dB and a physical temperatures of 275 K. The overall system noise temperature of the receiver

Que: The average effective input noise temperature of the receiver is

- a)420.5 K
- b)320.5 K
- c)220.5 K
- d)10.5 K

Correct answer is option 'B'. Can you explain this answer?

Vandana Mamman asked • 12 hours ago

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

Correct answer is option 'C'. Can you explain this answer?

Romsha Sinha asked • 13 hours ago

In a continuous time system x(t) and y(t) denotes the input and output respectively then which of the following corresponds to a casual system?

- a)y(t) = x(t - 2) + x(t - 4)
- b)y(t) = (t - 4) x(t + 1)
- c)y(t) = (t + 4) x(t - 1)
- d)y(t) = (t + 5) x(t + 5)

Correct answer is option 'C'. Can you explain this answer?

Meghna Kataria asked • 13 hours ago

A Child is looking for his father. He went 90 meters in the east before turning to his right. We went 20 meters before turning to his right again to look for his father at his uncle’s place 30 meters from this point. His father was not there. From there, he went 100 meters to his north before meeting his father in a street. How far did the son meet his father from starting point?

- a)100 m
- b)1000 m
- c)150 m
- d)1500 m

Correct answer is option 'A'. Can you explain this answer?

Piyush Vasuja asked • 14 hours ago

For a particular intensity of incident light on a silicon pn junction solar cell, the photocurrent density (J_{L}) is 2.5 mA/cm^{2} and the open-circuit voltage (V_{oc}) is 0.451 V. consider thermal voltage (V_{T}) to be 25mV. If the intensity of the incident light is increased by 20 times, assuming that the temperature remains unchanged. V_{oc} (in volts) will be ______.

Correct answer is '0.51 to 0.54'. Can you explain this answer?

AKASH KUMAR asked • 14 hours ago

Suppose we wish to transmit the signal x(t) = sin 200πt + 2 sin 400πt using a modulation that create the signal g(t) = x(t) sin 400πt. If the product g(t) sin 400πt is passed through an ideal LPF with cutoff frequency 400π and pass band gain of 2, the signal obtained at the output of the LPF is

- a)sin200πt
- b)1/2 sin200πt
- c)2sin 200πt
- d)0

Correct answer is option 'A'. Can you explain this answer?

Bhavan Verma asked • 14 hours ago

Consider the following statements:

1. A total of about one million bytes can be directly addressed by the 8086 microprocessors,

2. 8086 has thirteen 16 bit- registers.

3. 8086 has eight flags.

4. Compared to 8086, the 80286 provides a higher degree of memory protection.

1. A total of about one million bytes can be directly addressed by the 8086 microprocessors,

2. 8086 has thirteen 16 bit- registers.

3. 8086 has eight flags.

4. Compared to 8086, the 80286 provides a higher degree of memory protection.

Which of the statements given above are correct?

- a)2, 3 and 4
- b)1,3 and 4
- c)1,2 and 4
- d)1,2 and 3

Correct answer is option 'C'. Can you explain this answer?

Cpallavireddy1999 Pallavi asked • 15 hours ago

The p-type substrate in a monolithic circuit should be connected to

- a)d.c. ground point
- b)must be floating
- c)The most negative voltage available in the circuit
- d)The most positive voltage available in the circuit

Correct answer is option 'C'. Can you explain this answer?

Tresa Sunny asked • 15 hours ago

Two p^{+} n silicon junction is reverse biased at V_{R} = 5 V. The impurity doping concentration in junction A are N_{a} = 10^{18 }cm^{-3}and N_{d} = 10 ^{15} cm^{-3}, and those in junction B are N_{a} = 10^{18} cm^{-3 } and N_{d }= 10^{16} cm^{-3}. The ratio of the space charge width is

- a)4.36
- b)9.8
- c)19
- d)3.13

Correct answer is 'D'. Can you explain this answer?

AKASH KUMAR asked • 16 hours ago

Consider the region defined by |x|,|y| and |z| < 1. Let ε = 5ε_{0} , μ = 4μ_{o} and σ = 0 the displacement current densityJ_{d} = 20cos(1.5 x 10^{8} t - ax)u_{y} μA/m^{2}. Assume no DC fields are present.

Que: The magnetic field intensity is

- a)
- b)
- c)
- d)

Correct answer is option 'D'. Can you explain this answer?

Shoarib Quershi asked • 17 hours ago

There are two solutions of wine and water, the concentration of wine being 0.4 and 0.6 respectively. If five liters of the first solution be mixed with fifteen liters of the second, find the concentration of wine in the resultant solution.

- a)0.55
- b)0.45
- c)0.5
- d)0.57

Correct answer is option 'A'. Can you explain this answer?

Pushkar Malik asked • 17 hours ago

Consider the points s_{1} = - 3 + j4, and s_{2} = - 3 - j2, in the S - plane, then for a system with the open loop transfer function

- a)S
_{1}is on the root locus Out not S_{2} - b)S
_{2}is on the root locus but not S_{1} - c)both S
_{1}and S_{2}are on root locus - d)neither S
_{1}nor S_{2}is or root locus

Correct answer is option 'B'. Can you explain this answer?

Roopal Bansal asked • 17 hours ago

In the circuit shown, transistors Q_{1} and Q_{2} are biased at a collector current of 2.6mA. Assuming that transistor current gains are sufficiently large to assume collector current equal to emitter current and thermal voltage of 26 mV, the magnitude of voltage gain V_{0}/V_{s} in the mid-band frequency range is _____________ (up to second decimal place).

Correct answer is '49.0 to 51.0'. Can you explain this answer?

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