# The number of roots of the equation 2s4+s3+3s2+5s+7=0 that lie in the right half of s plane is

1.  zero

2.  one

3.  two

4.   three

4

two

Explanation :
No Explanation available for this question

# The feedback system with characterstic equation s4+20Ks3+5s2+10s+15=0 is

1.  stable for all value of K

2.  stable for positive value of K

3.  stable for ∞>K>7.0

4.   unstable for all values of K

4

unstable for all values of K

Explanation :
No Explanation available for this question

# The gain margin of the transfer function G(s)=will be

1.  4 db

2.  8db

3.  12db

4.   16db

4

12db

Explanation :
No Explanation available for this question

# Consider a unity feedback system having an open-loop transfer function G(jω)=for K=1, GM=28 dB. When GM at 20 dB, K will be equal to

1.  2

2.  2.5

3.  4

4.  5

4

2.5

Explanation :
No Explanation available for this question

# The characterstic equation of a feedback system is s3+Ks2+5s+10=0 for the system to be critically stable, the value of K should be

1.  1

2.  2

3.  3

4.   4

4

2

Explanation :
No Explanation available for this question

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

1.  0

2.  K>10

3.  ∞≤K

4.   0

4

0<K≤10

Explanation :
No Explanation available for this question

# A linear discrete-time system has the characterstic 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

is stable

Explanation :
No Explanation available for this question

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

1.  00

2.  63.40

3.  900

4.   ∞

4

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 characterstic equation in the right-half of s-plane is

1.  0

2.  1

3.  2

4.  3

4

0

Explanation :
No Explanation available for this question

1.  zero

2.  one

3.  two

4.   three

4