Which one of the following is an advantage of a PD controller in terms of damping(δ) and natural frequency(ωn)

1.  δ remains fixed but δ increases

2.  δ remains fixed but δ decreases

3.  δ remains fixed but δ increases

4.  δ remains fixed but δ decreases

View Answer  
4
Correct Answer :

δ remains fixed but δ increases


Explanation :
No Explanation available for this question

An open loop system has a transfer function 1/s3+1.5s2+s-1 It is converted into a closed loop system by providing a negative feedback having transfer function 20(s+1) The open loop and closed loop system are, respectively

1.  stable and stable

2.  stable and unstable

3.  unstable and stable

4.  unstable and unstable

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4
Correct Answer :

unstable and stable


Explanation :
No Explanation available for this question

A large ac generator, supplying power to an infinite bus, has a sudden short-circuit occuring ,at its terminals. Assuming the prime mover input and the voltage behind the transient reactance to remain constant immediately after the fault, the .acceleration of the, generator rotor is

1.  inversely proportional to the moment of inertia of the machine

2.  inversely proportional to' the square of the voltage

3.  directly Proportional to the square of the short-circuit current

4.   directly proportional to the short-circuit power

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4
Correct Answer :

inversely proportional to the moment of inertia of the machine


Explanation :
No Explanation available for this question

A closed loop system, employing lag-lead compensator Gc(s) is shown in the figure given below GC(s)=[1+1s/1+[?1s/β]][1+?2s/1+β?2s]-->β

1.  -20db/decade

2.  -40db/decade

3.  -60db/decade

4.  -80db/decade

View Answer  
4
Correct Answer :

-60db/decade


Explanation :
No Explanation available for this question

In a power system with negligible resistance, the fault current at a point is 8.00 p.u. The series reactance to be included at the fault point to limit the short-circuit current to 5.00 p.u. is

1.  3.000 p.u.

2.  0.200 p.u.

3.  0.125 p.u.

4.   0.075 p.u.

View Answer  
4
Correct Answer :

3.000 p.u.


Explanation :
No Explanation available for this question

The transfer function of a phase lead network as shown in the figure given below is K(1+0.3s)/(1+0.17s).The values of R1 and R2 are respectively

1.  300KΩ & 300KΩ

2.  300KΩ & 400KΩ

3.  400KΩ & 300KΩ

4.  400KΩ & 400KΩ

View Answer  
4
Correct Answer :

300KΩ & 400KΩ


Explanation :
No Explanation available for this question

Zero currents can flow from a line into a transformer bank if the windings are in

1.  ground star / delta

2.  delta / star

3.  star / grounded star

4.   delta /delta

View Answer  
4
Correct Answer :

ground star / delta


Explanation :
No Explanation available for this question

The Nyquist plot of G(s).H(s)=10/s2(1+0.5s).(1+s) will start(ω=∞)in the

1.  first quadrant and will terminate(ω=0) in the second quadrant

2.  fourth quadrant and will terminate(ω=0) in the second quadrant

3.  second quadrant and will terminate(ω=0) in the third quadrant

4.  first quadrant and will terminate(ω=0) in the fourth quadrant

View Answer  
4
Correct Answer :

first quadrant and will terminate(ω=0) in the fourth quadrant


Explanation :
No Explanation available for this question

The given figure shows wein bridge connection for frequency measurement. C and R are variables and ganged together. For balanced condition the expression for frequency is, f = 1/2πCR when

1.  R1 = R2

2.  R1 = 2R2

3.  R1 = R2/2

4.  R1 = 3R2

View Answer  
4
Correct Answer :

R1 = R2/2


Explanation :
No Explanation available for this question

Piezoelectric accelerometers

1.  should not be used for high frequencies above 100 Hz

2.  should be used for low frequencies

3.  should use a monitoring source of low input impedance

4.  have a low natural frequency

View Answer  
4
Correct Answer :

should be used for low frequencies


Explanation :
No Explanation available for this question
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