An overhead transmission line has a span of 240 m between level supports. What is the maximum sag if conductor weight 727 kg/km and has a breaking strength of 6880 kg Allow the factor of safety of 2 and neglect wind and ice loading.

1.  1.52 m

2.  1.6 m

3.  0.75 m

4.  125m.

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4
Correct Answer :

1.52 m


Explanation :
No Explanation available for this question

The z-transform of a signal is given by c (z)=z-1(1-z-4)/4(1-z-1)2.Its final value is

1.  1/4

2.  zero

3.  1

4.  infinity

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4
Correct Answer :

zero


Explanation :
No Explanation available for this question

The line conductor of a transmission line has an overall diameter of 19.53 mm, weight 0.844 kg/m and an ultimate breaking strength of 7950 kg. If factor of safety is to be 2, when conductor has an ice of 1 kg/m and a horizontal wind pressure of 1.5 kg/m. What is the vertical sag, corresponding to this loading for a 300 in span level supports

1.  1.08 m

2.  5.0 m

3.  5.22 m

4.  4.62 m

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4
Correct Answer :

5.22 m


Explanation :
No Explanation available for this question

In the derivative error compensation damping

1.  decreases and settling time decreases

2.  increases and settling time increases

3.  decreases and settling time increases

4.  increases and settling time decreases

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4
Correct Answer :

increases and settling time decreases


Explanation :
No Explanation available for this question

For a feedback control system of type 2,the steady State error for a ramp input is

1.  infinity

2.  constant

3.  zero

4.  indeterminate

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4
Correct Answer :

zero


Explanation :
No Explanation available for this question

A two conductor 1-π line operates at 50 Hz. The diameter of each conductor is 20 mm and spacing between conductors is 3m. What is the inductance of each conductor per kin

1.  1.19mH/km

2.  1.24 mH/km

3.  2.38 mH/km

4.   0.59 mH/km

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4
Correct Answer :

1.19mH/km


Explanation :
No Explanation available for this question

The close-loop transfer function of a control system  is given by - C(s)/R(s)=1/1+s  For the input r(t) =-. sin t, the steady state vale of c(t) is equal to

1.  1/2√cos t

2.  1

3.  1/√2 sin t

4.  1/√2 sin (t-π/4)

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4
Correct Answer :

1/√2 sin (t-π/4)


Explanation :
No Explanation available for this question

A two conductor 1-π line operates at 50 Hz. The diameter of each conductor is 20mm and spacing between conductor is 3m. When conductor material is steel of relative permeability 50, then loop inductance per km of the line will be

1.  8.2 mH/km

2.  7.281 mH/km

3.  5.0 mH/km

4.  2 mH/km

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4
Correct Answer :

7.281 mH/km


Explanation :
No Explanation available for this question

The impulse response of an initially relaxed linear system is e-2t u(t). To produce a response of te -2t u(t), the input must be equal to

1.  2 e-t u(t)

2.  1/2 e-2t u(t)

3.  e-2t u(t)

4.  e-t u(t)

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4
Correct Answer :

e-t u(t)


Explanation :
No Explanation available for this question

A 3-phase 50Hz transmission line has the following constant (line to neutral) Resistance = 10 ohms Inductive reactance = 20 ohms Capacitive an sceptance = 4 x 10-4 mhos. The inductance of the arc suppressor coil to be used in the system is

1.  0.06368 H

2.  0.127 H

3.  1.274 H

4.  2.590 H

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4
Correct Answer :

2.590 H


Explanation :
No Explanation available for this question
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