# The forward-path transfer function of a unity feedback system is G(s)=for the system to be stable the range of K is

1.  K>-1

2.  K

3.  -1

4.   marginal stable

4

marginal stable

Explanation :
No Explanation available for this question

# The unstable system is

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# A control system is as shown in the given figure. The maximum value of gain K for which the system is stable is

1.  √3

2.  3

3.  4

4.   5

4

5

Explanation :
No Explanation available for this question

# For the transfer function G(s)H(s)=the phase cross-over frequency is

4

Explanation :
No Explanation available for this question

# What is the unit step response of a unity feedback control system having forward path transfer function G(s)=

1.  overdamped

2.  Critically damped

3.  underdamped

4.   undamped oscillatory

4

undamped oscillatory

Explanation :
No Explanation available for this question

# The correct sequence of steps needed to improve system stability is

1.  insert derivative action, use negative feedback reduce again

2.  reduce gain, use negative feedback, insert derivation action

3.  reduce gain, insert derivation action, use negative feedback

4.   use negative feedback, reduce gain, insert derivation action

4

use negative feedback, reduce gain, insert derivation action

Explanation :
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# Consider the following polynomials: 1.s4+7s3+17s2+17s+6 2. s4+11s3+41s2+61s+30. 3. s4+s3+2s2+3s+2. Among these polynomials, those which are Hurwitz are

1.  1 and 3

2.  2 and 3

3.  1 and 2

4.   1,2 and 3

4

1 and 2

Explanation :
No Explanation available for this question

# The open-loop transfer function of a unity feedback control system is

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# A system has a complex conjugate root pair of multiplicity two or more in its characterstics equation.The impulse response of the system will be

1.  a sinusoidal oscillation which decaying exponential; the system is therefore stable.

2.  a sinusoidal oscillation with time multiplier the system is therefore unstable.

3.  a sinusoidal oscillation which rises exponentially with time; the system is therefore unstable.

4.   a dc term and harmonic oscillation; the system therefore becomes limitingly stable

4

a sinusoidal oscillation with time multiplier the system is therefore unstable.

Explanation :
No Explanation available for this question

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2.

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