Control System_2 Objective Questions:
Que 1. The damping ratio and peak overshoot are measures of:
1) Relative stability
2) Speed of response
3) Steady state error
4) Absolute stability
Ans: 2
Que 2. A system has a complex conjugate root pair of multiplicity two or more in its characteristic equation. The impulse response of the system will be:
1) A sinusoidal oscillation which decays exponentially; the system is therefore stable
2) A sinusoidal oscillation with a time multiplier ; the system is therefore unstable
3) A sinusoidal oscillation which rises exponentially ; the system is therefore unstable
4) A dc term harmonic oscillation the system therefore becomes limiting stable
Ans: 3
Que 3. What will be the nature of time response if the roots of the characteristic equation are located on the s-plane imaginary axis?
1) Oscillations
2) Damped oscillations
3) No oscillations
4) Under damped oscillations
Ans: 3
Que 4. Which one of the following is the most likely reason for large overshoot in a control system?
1) High gain in a system
2) Presence of dead time delay in a system
3) High positive correcting torque
4) High retarding torque
Ans: 3
Que 5. In a RLC series circuit, if the resistance R and inductance L are kept constant but capacitance C is decreased, then which one of the following statements is/are correct?
1. Time constant of the circuit is changed.
2. Damping ratio decreases.
3. Natural frequency increases.
4. Maximum overshoot is unaffected.
1) 1 and 2
2) 2 only
3) 2 and 3
4) 3 and 4
Ans: 3
Que 6. For critically damped second order system, if the gain constant(K) is increased, the system behavior
1) Becomes oscillatory
2) Becomes under damped
3) Becomes over damped
4) Shows no change
Ans: 2
Que 7. The maximum overshoot is:
1) To measure the relative stability
2) A system with large overshoot is desirable
3) It occurs at second overshoot
4) Both b and c
Ans: 1
Que 8. In a second order feedback control system natural frequency and damping
1) Can be designed by changing the gain of the individual system
2) Cannot be designed by changing the gain of the individual system
3) Are independent on the type of input excitation
4) None of the mentioned
Ans: 1
Que 9. Undamped natural frequency of a second order system has the following influence on the response due to various excitations:
1) Increase in speed of response and decrease sensitivity
2) Decrease in speed of response and increase sensitivity
3) Has no influence in the dynamic response
4) Increase oscillatory behavior
Ans: 1
Que 10. Normalized response of a dynamic system refers to:
1) Characteristic feature of a response due to specific excitation irrespective of its amplitude
2) Response of dynamic system divided by its maximum value
3) Response of dynamic system divided by a standard value
4) None of the mentioned
Ans: 1
1) Relative stability
2) Speed of response
3) Steady state error
4) Absolute stability
Ans: 2
Que 2. A system has a complex conjugate root pair of multiplicity two or more in its characteristic equation. The impulse response of the system will be:
1) A sinusoidal oscillation which decays exponentially; the system is therefore stable
2) A sinusoidal oscillation with a time multiplier ; the system is therefore unstable
3) A sinusoidal oscillation which rises exponentially ; the system is therefore unstable
4) A dc term harmonic oscillation the system therefore becomes limiting stable
Ans: 3
Que 3. What will be the nature of time response if the roots of the characteristic equation are located on the s-plane imaginary axis?
1) Oscillations
2) Damped oscillations
3) No oscillations
4) Under damped oscillations
Ans: 3
Que 4. Which one of the following is the most likely reason for large overshoot in a control system?
1) High gain in a system
2) Presence of dead time delay in a system
3) High positive correcting torque
4) High retarding torque
Ans: 3
Que 5. In a RLC series circuit, if the resistance R and inductance L are kept constant but capacitance C is decreased, then which one of the following statements is/are correct?
1. Time constant of the circuit is changed.
2. Damping ratio decreases.
3. Natural frequency increases.
4. Maximum overshoot is unaffected.
1) 1 and 2
2) 2 only
3) 2 and 3
4) 3 and 4
Ans: 3
Que 6. For critically damped second order system, if the gain constant(K) is increased, the system behavior
1) Becomes oscillatory
2) Becomes under damped
3) Becomes over damped
4) Shows no change
Ans: 2
Que 7. The maximum overshoot is:
1) To measure the relative stability
2) A system with large overshoot is desirable
3) It occurs at second overshoot
4) Both b and c
Ans: 1
Que 8. In a second order feedback control system natural frequency and damping
1) Can be designed by changing the gain of the individual system
2) Cannot be designed by changing the gain of the individual system
3) Are independent on the type of input excitation
4) None of the mentioned
Ans: 1
Que 9. Undamped natural frequency of a second order system has the following influence on the response due to various excitations:
1) Increase in speed of response and decrease sensitivity
2) Decrease in speed of response and increase sensitivity
3) Has no influence in the dynamic response
4) Increase oscillatory behavior
Ans: 1
Que 10. Normalized response of a dynamic system refers to:
1) Characteristic feature of a response due to specific excitation irrespective of its amplitude
2) Response of dynamic system divided by its maximum value
3) Response of dynamic system divided by a standard value
4) None of the mentioned
Ans: 1
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