# The characteristic equation of a closed-loop system is given by s4 + 6s3 + 11s2 + 6s +K = 0 Stable closed loop behaviour can be ensured when gain K is such that

1.  0 < K < 10

2.  K > 10

3.  -∞ < K < ∞

4.  0 < K < 20

4
Correct Answer :

0 < K < 10

Explanation :
No Explanation available for this question

# The voltage at receving end is 132 kV. The rms value and phase angle of the reflected voltage to neutral at the receiving end will be

1.  76200 V, 40 kV

2.  76200 V, 38.1 kV

3.  76200 V, 50 kV

4.   76200 V, 29.8 kV

4
Correct Answer :

76200 V, 38.1 kV

Explanation :
No Explanation available for this question

# A linear discrete-time system has the characteristic equation, z3-0.81z = 0 The system

1.  is stable

2.  is marginally stable

3.  is unstable

4.  stability cannot be assessed from the given information

4
Correct Answer :

is stable

Explanation :
No Explanation available for this question

# What is the overall diameter of a single core cable when its working on a three phase 264 kV system The maximum permissible stress in the dielectric is not to exceed 20 kV/mm.

1.  21.4 mm

2.  24.4 mm

3.  22.4 mm

4.  28.2 mm

4
Correct Answer :

21.4 mm

Explanation :
No Explanation available for this question

# The phase margin of a system with the open-loop transfer function G(s)H(s) =(1- s) /(1 + s)(2 + s) is

1.  00

2.  63.40

3.  900

4.  ∞

4
Correct Answer :

Explanation :
No Explanation available for this question

# A single core lead covered cable is to be designed for 132 kV to earth. Its conductor radius is 20 nun and its insulating material A, B and C have relative permittivities 5, 4 and 3 respectively and corresponding maximum permissible stresses of 3.6, 24 and 2.0 kV/mm (rms) respectively. The minimum diameter of the lead steath will be

1.  190 mm

2.  125 mm

3.  150.0 mm

4.  173.7 mm

4
Correct Answer :

173.7 mm

Explanation :
No Explanation available for this question

# The Nyquist plot for the open-loop transfer function G(s) of a unity negative feedback system is shown in the figure. If G(s) has no pole in the right-half of s-plane, the number of roots of the system characteristic equation in the right-half of s-plane is

1.  0

2.  1

3.  2

4.  3

4
Correct Answer :

0

Explanation :
No Explanation available for this question

# A 60 kV (rms) single core metal sheathed cable is to be graded by means of a metallic intersheath. The safe electric stress of the insutating material is 6 kV/mm (rms). The overal diameter of the intersheath is

1.  10 mm

2.  20 mm

3.  15 mm

4.  7.5 mm

4
Correct Answer :

20 mm

Explanation :
No Explanation available for this question

# The number of roots of s3 + 5 s2 + 7s + 3 = 0 in the right half of the s-plane is

1.  zero

2.  one

3.  two

4.  three

4
Correct Answer :

zero

Explanation :
No Explanation available for this question

# A 1 km of a three phase metal sheathed belted cable gave a measured capacitance of 0.7 F between one conductor and the other two conductors bunched together with the earth sheath and 1.5 F measured between the three bunched conductors and the sheath. What is the charging current, when the cable is connected at 11 kV, 50 Hz supply

1.  0.80 A/phase

2.  1.40 A/phase

3.  1.59 A/phase

4.  1.695 A/phase

4
Correct Answer :

1.59 A/phase

Explanation :
No Explanation available for this question

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