For the system 2/s+1, the approximate time taken for a step response to reach 98% of its final value is:

- a)1s
- b)2s
- c)4s
- d)8s

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

ANJU BALA answered • 3 hours ago

Answer: c

Explanation: C(s)/R(s) = 2/s+1

R(s) = 1/s (step input)

C(s) = 2/s(s+1)

c(t) = 2[1-e^{-t}] 1.96 = 2[1-e^{-T}] T= 4sec.

Explanation: C(s)/R(s) = 2/s+1

R(s) = 1/s (step input)

C(s) = 2/s(s+1)

c(t) = 2[1-e

ANSH GUPTA asked • 1 minute ago

In the given logic diagram the propagation delays of both the gates are 20 nsec each. The output y is at logic ‘1’ from a long time and at t = 0, the input x change from 0 to 1, so the output goes momentary to logic 0, determine the time required by the output to again maintain its level at logic 1.

- a)0 nsec
- b)20 nsec
- c)40 nsec
- d)60 nsec

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

Consider the loop transfer function K(s+6)/(s+3)(s+5) In the root locus diagram the centroid will be located at:

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

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

ANITA KUMARI answered • 3 hours ago

Answer: c

Explanation: Centroid =Sum of real part of open loop pole-sum of real part of open loop zeros/P-Z

Explanation: Centroid =Sum of real part of open loop pole-sum of real part of open loop zeros/P-Z

Consider the following statements regarding root loci:

- a)All root loci start from the respective poles of G(s) H(s)
- b)All root loci end at the respective zeros of G(s) H(s) or go to infinity
- c)The root loci are symmetrical about the imaginary axis of the s-plane
- d)All root loci start and end from the respective poles of G(s) H(s) or go to infinity

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

SEEMA DEVI answered • 3 hours ago

Answer: b

Explanation: All the root locus start at respective poles and end at zeroes.

Explanation: All the root locus start at respective poles and end at zeroes.

The loop transfer function of an LTI system is G(s)H(s) =K(s+1)(s+5)/s(s+2)(s+3). For K>0, the point on the real axis that does not belong to the root locus of the system is

- a)-0.5
- b)-2.5
- c)-3.5
- d)-5.5

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

ANITA KUMARI answered • 3 hours ago

Answer: c

Explanation: The points present on the root locus are right to the odd number of poles and zeroes.

Explanation: The points present on the root locus are right to the odd number of poles and zeroes.

The critical value of gain for a system is 40 and gain margin is 6dB. The system is operating at a gain of:

- a)20
- b)40
- c)80
- d)120

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

SAURABH PRAKASH answered • 3 hours ago

Answer: a

Explanation: Gm (dB) = 20logGM

GM =2

As we know, GM =K (marginal)/K (desired)

K desired =40/2 =20.

Explanation: Gm (dB) = 20logGM

GM =2

As we know, GM =K (marginal)/K (desired)

K desired =40/2 =20.

If the system is represented by G(s) H(s) = k (s+7) / s (s +3) (s + 2), what would be its magnitude at ω = ∞?

- a)0
- b)∞
- c)7/10
- d)21

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

VAIBHAV THAKUR answered • 3 hours ago

Answer: a

Explanation: On calculating the magnitude of the system and putting the value of frequency one gets the magnitude as 0.

Explanation: On calculating the magnitude of the system and putting the value of frequency one gets the magnitude as 0.

In polar plots, if a pole is added at the origin, what would be the value of the magnitude at Ω = 0?

- a)Zero
- b)Infinity
- c)Unity
- d)Unpredictable

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

AYUSH RAO answered • 3 hours ago

Answer: b

Explanation: Addition of pole causes instability to the system.

Explanation: Addition of pole causes instability to the system.

The critical clearing angle of a power system is related to

- a)reactive power limit
- b)short circuit limit
- c)steady state stability limit
- d)transient stability limit

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

SIDHARTH M answered • 3 hours ago

t_{cr} and δ_{cr} are related to transient stability limit. The fault in a power system must be cleared before δ reaches δ_{cr }and before t_{cr}.

What happens to the inductance when the magnetic field strength decreases?

- a)Increases
- b)Decreases
- c)Remains the same
- d)Becomes zero

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

SIDDHARTH SHARMA answered • 3 hours ago

Inductance is directly proportional to the magnetic field strength in the coil, hence as the magnetic field strength increases, inductance decreases.

A polar plot intersects the unit circle at a point making -45° to the negative real axis then the phase margin of the system is :

- a)-45°
- b)45°
- c)180°-45°
- d)180°+45°

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

RANJITH KUMAR answered • 14 hours ago

Answer: b

Explanation: As the angle is with the negative real axis hence the Phase margin will be 45°.

Explanation: As the angle is with the negative real axis hence the Phase margin will be 45°.

If the initial conditions are inherently zero, what does it physically mean?

- a)The system is at rest but stores energy
- b)The system is working but does not store energy
- c)The system is at rests or no energy is stored in any of its parts
- d)The system is working with zero reference input

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

KANDALKAR ANURAG answered • 14 hours ago

Answer: c

Explanation: A system with zero initial condition is said to be at rest since there is no stored energy.

Explanation: A system with zero initial condition is said to be at rest since there is no stored energy.

Assertion (A): In a shunt regulator, the control element is connected in shunt with the load to achieve constant output voltage.

Reason (R): The impedance of the control element varies to keep the total current flowing through the load and the control element constant.

Reason (R): The impedance of the control element varies to keep the total current flowing through the load and the control element constant.

- 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 correct Explanation of A
- c)A is True and R is false
- d)A is False and R is true

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

NITESH DUBEY answered • 14 hours ago

Answer: c

Explanation: Shunt regulator refers to the winding connected in shunt or parallel and to achieve constant output voltage

Explanation: Shunt regulator refers to the winding connected in shunt or parallel and to achieve constant output voltage

Ac signals are given to both inverting and non-inverting terminals of an op-amp. When will the output maximum

- a)when the phase difference between the inputs is 0º
- b)when the phase difference between the inputs in 90º
- c)when the phase difference between the inputs is 180º
- d)when the phase difference between the inputs is 0 or 180º

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

JATIN AGGARWAL answered • 14 hours ago

For non-inverting terminal input, output is in phase with input. For inverting terminal input, output is 180º out of phase with input. If inputs have 180º phase difference, outputs will be in phase and additive.

In control systems the magnitude of error voltage

- a)is very small
- b)is very large
- c)neither small nor large
- d)may be any value from 0 to 50 V

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

ANSH GUPTA answered • 14 hours ago

The error voltage is always very small. A high value of error voltage may cause instability.

The reverse leakage current of the transistor when connected in CB configuration is 0.2 μA and it is 18 μA when the same transistor is connected in CE configuration. The value of α and β of the transistor for a base current of 30 mA will be respectively

- a)0.988 and 120
- b)0.966 and 42.5
- c)0.988 and 89
- d)0.966 and 120

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

RAJESHWAR SINGH answered • 14 hours ago

Rupak Mandal asked • 2 hours ago

In a synchronous motor, the breakdown torque is

- a)directly proportional to applied voltage
- b)directly proportional to the square of the applied voltage
- c)inversely proportional to applied voltage
- d)none of the above

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

Which one of the following are correct?The root locus is the path of the roots of the characteristic equation traced out in the s-plane?

- a)As the input of the system is changed
- b)As the output of the system is changed
- c)As a system parameter is changed
- d)As the sensitivity is changed

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

RISHABH KUMAR answered • 14 hours ago

Answer: c

Explanation: The root locus is the locus of the change of the system parameters of the characteristic equation traced out in the s-plane.

Explanation: The root locus is the locus of the change of the system parameters of the characteristic equation traced out in the s-plane.

Find the voltage across the 6 ohm resistor.

- a)150V
- b)181,6V
- c)27.24V
- d)54.48V

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

Raju Gajula answered • 14 hours ago

Which opposes the current

because of total resistors adding at a time

and divide with total volage

answer is 27.24 v

because of total resistors adding at a time

and divide with total volage

answer is 27.24 v

Potu Madhavi asked • 3 hours ago

For the same voltage drop, increasing the voltage of a distributor n-times.

- a)reduces the x-section of the conductor by n times
- b)increases the x-section of the conductor by n times
- c)reduces the x-section of the conductor by n
^{2}times - d)increases the x-section of the conductor by n
^{2 }times.

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

ABDUL KAIF asked • 4 hours ago

An unsymmetrical fault on a transmission line gives the sequence voltage and sequence current

V_{a1} = 0.837 pu

V_{a2} = -0.45 pu

V_{a0} = -0.2 pu

and sequence current I_{1} = I_{2} = I_{0} = -j1.2 pu. What is the type of the fault.

V

V

and sequence current I

- a)L-L
- b)LLG
- c)LG
- d)3φ

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

Rachika Grewal asked • 9 hours ago

Match List-I (Logic gates) with List-ll (Applications) and select the correct answer using the codes given below the lists:

List-i

A. Exclusive OR gate

B. NOT gate

C. Exclusive NOR gate

D. NOR gate

A. Exclusive OR gate

B. NOT gate

C. Exclusive NOR gate

D. NOR gate

List-ll

1. As a controlled inverter

2. As an universal gate

3. Complementation

4. Even-odd parity check

1. As a controlled inverter

2. As an universal gate

3. Complementation

4. Even-odd parity check

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

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

Dev Never Give Up asked • 14 hours ago

Two -insulator discs of identical capacitance value C makes up a string for a 22 kV, 50 Hz,single-phase overhead line insulation system. If the pin to earth capacitance is also C, then the string efficiency is

- a)50%
- b)75%
- c)90%
- d)86%

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

Amit Parashar asked • 15 hours ago

A 50 Hz, 11 kV, 3 phase alternator with earthed neutral having a reactance of 3 ohms per phase and is connected to a bus bar through a circuit breaker, if the distributed capacitance upto CB between the phase and neutral is 0.01 μ F.

What is the peak re striking voltage?

- a)18.36 kV
- b)17.96 kV
- c)15.96 kV
- d)12.65 kV

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

JATIN AGGARWAL asked • 18 hours ago

A 10-pole, 3-phase, 50 Hz, delta connected induction motor takes 120 kW during blocked-rotor test at rated voltage and frequency. If the stator ohmic loss is equal to rotor ohmic loss during blocked rotor test, then the starting torque if DOL starting is used for this motor will be

- a)822.56 N-m
- b)954.93 N-m
- c)525.76 N-m
- d)730 N-m

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

Vishnu A asked • 19 hours ago

- 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

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

Irshad Shaikh asked • 21 hours ago

The action of JFET in its equivalent circuit can best be represented as a

- a)current controlled current source
- b)current controlled voltage source
- c)voltage controlled voltage source
- d)voltage controlled current source

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

Suraj Kumar asked • 23 hours ago

Which of the following device can be used as a phase advancer ?

- a)3-f induction motor squirrel cage type
- b)3-f induction motor slip ring type
- c)synchronous motor working at leading power factor
- d)synchronous motor working at lagging power factor

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

Sunil Manjani asked • yesterday

A Wien-bridge is used to measure the frequency of the input signal. However, the input signal has 10% third harmonic distortion. Specifically the signal is 2 sin 400 πt + 0.2 sin 1200 πt (with t insec). With this input the balance will

- a)Lead to a null indication and setting will correspond to a frequency of 200 Hz
- b)Lead to a null indication and setting will correspond to 260 Hz
- c)Lead to a null indication and setting will correspond to 400 Hz
- d)Not lead to null indication

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

RANJITH KUMAR asked • yesterday

What is the correct sequence of the following type of ammeters and voltmeters with increasing accuracy ?

1. Moving iron

2. Moving coil permanent magnet

3. Induction

Select the correct answer using the codes givenbelow

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

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

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