For a second-order system with the closed loop transfer function T(s) = 9/s2+4s+9, the settings time for 2-percent band in seconds, is

1. 1.5

2. 2.0

3. 0.01

4. 4.0

View Answer

Correct Answer :

2.0

Explanation :
No Explanation available for this question

The transfer function of a phase lead controller is 1 + 3Ts/1+Ts. The maximum value of phase provided by this, controller is

1. 900

2. 600

3. 450

4. 300

View Answer

Correct Answer :

30⁰

Explanation :
No Explanation available for this question

The additional cost per hour to increase the output of plant 1 by 1 MW is

1. 200 Rs/MWh

2. 151 Rs/MWh

3. 160 Rs/MWh

4. 180 Rs/MWh

View Answer

Correct Answer :

160 Rs/MWh

Explanation :
No Explanation available for this question

Consider the following statements regarding the advantages of closed loop negative feedback control-systems over open-loop systems. 1. The overall reliability of the closed-loop system is more than that of open loop system. 2. The transient response in the closed loop system decays more quickly, than in the open loop system 3. In the open-loop System closing of the loop increases the-overall gain of the system 4. In the closed-loop system, the effect of variation of component parameters on its performances is reduced. Of these Statements

1. 1 and 3 are correct

2. 1 and 2 are correct

3. 2 and 4 are correct

4. 3 and 4 are correct

View Answer

Correct Answer :

2 and 4 are correct

Explanation :
No Explanation available for this question

Which one of the following statements is true for gain margin and phase margin of two closed-loop system having loop transfer faction G(s) H (s) m exp (- s) G(s) H(s)

1. Both gain and phase margins of the two system will be identical

2. Both gain and phase margins of G(s) H (s) wild be more

3. Gain margins of the two systems are the same but phase margin of G(s) H(s) will be more

4. Phase margins of the two systems are the same but gain margin of G(s) H(s) will be less

View Answer

Correct Answer :

Gain margins of the two systems are the same but phase margin of G(s) H(s) will be more

Explanation :
No Explanation available for this question

A 3-Φ supply, 5 kW induction motor has a power factor 0.75 lagging. A bank of capacitors is connected in delta across the supply terminals and power factor raised to 0.9 lagging. kVAR rating of the capacitors connected in each phase, will be

1. 0.66 kVAr

2. 0.60 kVAr

3. 1.21 kVAr

4. none of these

View Answer

Correct Answer :

0.66 kVAr

Explanation :
No Explanation available for this question

The transfer function of system is F(s)=10(1+0.2s)/(2+0.5s) The phase shift at ω=-∞ will be

1. 90o and0o

2. -180o and 180o

3. -90o and 70o

4. None of these

View Answer

Correct Answer :

None of these

Explanation :
No Explanation available for this question

A power system has two generating plants and the power is being dispatched economically with P1 = 125 MW and P2 = 250 MW. The loss coefficients are B11 = 0.10 x 102 MW-1, B12= - 0.01 x 10-2 MW-1 B22 = 0.13 x 10-2 MW-1to raise the total load on the system by 1 MW will cost an additional 200 per hour. The penalty factor for plant 1 will be

1. 1.51

2. 1.45

3. 1.32

4. 1.25

View Answer

Correct Answer :

1.25

Explanation :
No Explanation available for this question

Transfer function of transportation lag is e-sT. If the lag is small as compared with the time constant of the system, it can be approximated by

1. sT

2. 1+sT

3. 1-sT

4. 1/1+sT

View Answer

Correct Answer :

1-sT

Explanation :
No Explanation available for this question

The again margin (in dB)of a system having the loop transfer function G(s)H(s)=√2/s(s+1)is

1. 0

2. 3

3. 6

4. ∞

View Answer

Correct Answer :

∞

Explanation :
No Explanation available for this question

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