# 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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

1-sT

Explanation :
No Explanation available for this question

1.  0

2.  3

3.  6

4.  ∞

4