# The sequence components of the fault current are as follows Ipositive = j1.5 pu, Inegative = -j0.5 pu, Izero = -j 1 pu. The type of fault in the system is

1.  LG

2.  LL

3.  LLG

4.  LLLG

4

LLG

Explanation :
No Explanation available for this question

# The severity of line to ground and three phase faults at the terminals of an unloaded synchronous generator is to be same. If the terminal voltages is 1.0 p.u and Z1 = Z2 = j0.1 p.u, Z0 = j0.05 p.u for the alternator, then the required inductive reactance for neutral grounding is

1.  0.0166 p.u

2.  0.05 p.u

3.  0.1 p.u

4.  0.15 p.u

4

0.0166 p.u

Explanation :
No Explanation available for this question

# The transient stability of the power system can be effectively improved by

1.  Excitation improved by

2.  Phase shifting transformer

3.  Single pole switching of circuit breakers

4.  Increasing the turbine value opening

4

Single pole switching of circuit breakers

Explanation :
No Explanation available for this question

# In the given figure, spring constant is K, viscous friction coefficient is B, mass is M and the system output motions is x(t) corresponding to input force F (t). Which of the following parameters related to the above system 1 .Time constant=1/M 2.Damping coefficient=B/2√KM 3.Natural frequency of oscillation=√K/M select the correct answer using the codes given below:

1.  1,2 and 3

2.  1 and 2

3.  2 and 3

4.  1 and 3

4

2 and 3

Explanation :
No Explanation available for this question

# A system is represented by the block diagram given in the figure Which of the following' represents the input output relationship of the above diagram

1.  R(s)-->(G1G2)-->C(s)

2.  R(s)-->(G1+G2)-->C(s)

3.  R(s)-->(1+G1+G2G3)-->C(s)

4.  R(s)-->(1+G2+G1G2)-->C(s)

4

R(s)-->(1+G2+G1G2)-->C(s)

Explanation :
No Explanation available for this question

# The transfer function C/R of the system shown in the figure is

1.  G1G2H2/H1(1+G1G2H2)

2.  G1H2/H1(1+G1G2H2)

3.  G2H2/H1(1+G1G2H1)

4.  G2H1/H2(1+G1G2H2)

4

G1H2/H1(1+G1G2H2)

Explanation :
No Explanation available for this question

# The closed loop system shown in the figure subjected to a disturbance N(s). The transfer function C(s)/N(s) is given by

1.  G1G2/1+G1G2H

2.  G2/1+G2H

3.  G1/1+G1H

4.  G2/1+G1G2H

4

G2/1+G1G2H

Explanation :
No Explanation available for this question

# The transfer function C(s)/R(s) of the system whose block diagram is given below is

1.  G1G2/1+G1H1+G2H2-G1G2H1H2

2.  G1G2/1+G1H1+G2H2+G1G2H1H2

3.  G1G2/1+G1H1+G2H2

4.  G1(1+G2H2)+G2(1+G1H1)/1+G1H1+G2H2+G1G2H1H2

4

G1G2/1+G1H1+G2H2+G1G2H1H2

Explanation :
No Explanation available for this question

# Consider a simple mass-spring-friction system a:q given in the figure k1=spring constant f=friction M=mass F=force x=displacement The transfer function X(s)/F(s) of the given system will be

1.  1/Ms2+fs+K1.K2

2.  1/Ms2+fs+K1+k2

3.  1/Ms2+fs+K.K2/K1+K2

4.  K2/Ms2+fs+K1

4

1/Ms2+fs+K1+k2

Explanation :
No Explanation available for this question

1.  0.5

2.  0.75

3.  0.6

4.  2.0

4