# The open-loop DC gain of a unity negative feedback system with closed-loop transfer function s+4/s2+7s+13 is

1.  4/13

2.  4/9

3.  4

4.  13

4
Correct Answer :

4/9

Explanation :
No Explanation available for this question

# In a DC transmission line

1.  it is necessary for the sending end and receiving end to be operated in synchronism

2.  the effects of inductive and capacitive reactances are greater than in an AC transmission line of the same rating

3.  there are no effects due to inductive and capacitive reactances

4.  power transfer capability is limited by stability considerations

4
Correct Answer :

there are no effects due to inductive and capacitive reactances

Explanation :
No Explanation available for this question

# The impedance of a circuit is given by z = 3 + j4. Its conductance will be

1.  1/3

2.  3/5

3.  3/25

4.  4/5

4
Correct Answer :

3/25

Explanation :
No Explanation available for this question

# A system has the transfer function(1-s)/(1 + s) . It is called

1.  low-pass system

2.  high-pass system

3.  all-pass system

4.  none of these

4
Correct Answer :

high-pass system

Explanation :
No Explanation available for this question

# The transfer function of a system is 2s2 + 6s+ 5 /(s + 1)2 (s + 2) The characteristic equation of the system is

1.  2s2 + 6s + 5 = 0

2.  (s+1)2 (s + 2) = 0

3.   2s2 + 6s + 5 + (s + 1)2(s + 2) = 0

4.  2s2 + 6s + 5 - (s + 1)2(s+2)=0

4
Correct Answer :

(s+1)2 (s + 2) = 0

Explanation :
No Explanation available for this question

# The transfer function of a tachometer is of form

1.  Ks

2.  K/s

3.  K/(s +1)

4.  K/s(s+1)

4
Correct Answer :

Ks

Explanation :
No Explanation available for this question

# The per unit impedance of a circuit element is 0.15. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

1.  0.075

2.  0.15

3.  0.30

4.   0.600

4
Correct Answer :

0.30

Explanation :
No Explanation available for this question

# The signal flow diagram of a system is shown in the given figure. The number of forward paths and the number of pairs of non-touching loops are respectively

1.  3, 1

2.  3, 2

3.  4, 2

4.  2, 4

4
Correct Answer :

4, 2

Explanation :
No Explanation available for this question

# The conductor of a 10 km long, single phase, two wire line are separated by a distance of 1.5 m. The diameter of each conductor is 1 cm. If the conductors are of copper, the inductance of the circuit is

1.  50.0 mH

2.  45.3 mH

3.  23.8 mH

4.  19.6 mH

5.

5
Correct Answer :

23.8 mH

Explanation :
No Explanation available for this question

# When the signal flow graph is as shown in the figure the overall transfer function of the system will be

1.  C/R=G

2.  C/R=G/1+H2

3.  C/R=G/(1+H1)(1+H2)

4.  C/R=G/1+H1+H2

4
Correct Answer :

C/R=G/1+H2

Explanation :
No Explanation available for this question

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