# If the unit step response of a network is (1- e-αt), then its unit impulse response will be

1.  αe-αt

2.  αe-t/α

3.  1/αe-αt

4.  (1-α)e-αt

4

αe-αt

Explanation :
No Explanation available for this question

# If within an untransposed 3-phase circuit of a transmission line, the series impedance of each of the conductors is considered, it is found to contain resistive terms of the form. K loge (d12/d13) K being a constant and d12 and d13 etc, being space between the conductors. These terms represent power transfer from one phase to another. The sum of these terms over the three phases is

1.  three times the average

2.  √3 times the average

3.  one-third of the average

4.   zero

4

zero

Explanation :
No Explanation available for this question

# Given KKt = 99 ; s = j1 rad/s The sensitivity of the closed-loop system (shown in the figure) to variation in parameter K is approximately

1.  0.01

2.  0.1

3.  1.0

4.  10

4

0.1

Explanation :
No Explanation available for this question

# "Expanded ACSR" are conductors composed of

1.  larger diameter individual strands for a given cross-section of the aluminium strangs

2.  larger diameter of a central steel strands for a given overall diameter of the conductor

3.  larger diameter of the aluminium strands only for a given overall diameter of the conductor

4.   a fillter between the inner steel and the outer aluminium strands to increase the overall diameter of the conductor

4

a fillter between the inner steel and the outer aluminium strands to increase the overall diameter of the conductor

Explanation :
No Explanation available for this question

# What is the sag for a span of 400m, if the ultimate tensile strength of conductor is 6000 kgf, and the weight of conductor is 550 kgf/km Factor of safety is 2.

1.  1.016 m

2.  2.40 m

3.  3.6 m

4.   4.2 m

4

3.6 m

Explanation :
No Explanation available for this question

# A transmission line has a span of 275 m between level supports. The conductor has a diameter of 19.53mm, weight 0.844 kgf/m and has an ultimate breaking strength of 7950 kgf. Each conductor has a radial covering of ice 9.53 mm thick and is subjected to a horizontal wind pressure of 40 kgf/m2 of ice covering projected area. If the factor of safety is 2, what is the deflected sag Ice weight is 913.5 kgfm3.

1.  5.36 m

2.  4.1 m

3.  3.9m

4.   3.01m

4

5.36 m

Explanation :
No Explanation available for this question

# The performance specifications for a unity feedback control system having an open-loop transfer function G(s)=K/ s(s + 1)(s +2) are (i) Velocity error coefficient Kv > 10sec-1 (ii) Stable closed-loop operation. The value of K, satisfying the above specifications, is

1.  K> 6

2.  6 < K< 10

3.  K > 10

4.  none of these

4

none of these

Explanation :
No Explanation available for this question

# A transmission line conductor at a river crossing is supported from two towers at heights of 30m and 90m above water level. The horizontal distance between towers is 270m, if tension in the conductor is 1800 kg and conductor weight 1 kg/ m. What is the clearance between conductor and the water at a point midway between the towers

1.  79.50 m

2.  54.94 m

3.  60 m

4.   51.4 m

4

54.94 m

Explanation :
No Explanation available for this question

# The unit step response of a second order linear system with zero initial states is given by c(t) = 1 + 1.25 exp (-6t) sin (8t - tan-1 1.333); t>=0 The damping ratio and the undamped natural frequency of oscillation of the system are respectively

4

Explanation :
No Explanation available for this question

1.  1/ 4

2.  0

3.  ∞

4.  1/2

4