# 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

4

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

4

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

4

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

4

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.

4

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

4

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

4

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

4

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

4

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

4