MCQOPTIONS
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MCQOPTIONS
This section includes 43 Mcqs, each offering curated multiple-choice questions to sharpen your Control Systems knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
" Consider the following statements for the pneumatic and hydraulic systems:1. The normal operating pressure of pneumatic control is very much higher than that of hydraulic control.2. In, pneumatic control external leakage is permissible to a certain extent, but there should no leakage in a hydraulic control.Which of the statements given above is/are correct?" |
| A. | " 1 only" |
| B. | " 2 only" |
| C. | " Both 1 and 2" |
| D. | " Neither 1 and 2" |
| Answer» D. " Neither 1 and 2" | |
| 2. |
" The impulse response of a linear LTI system is given as g (t) = e(-t)The transfer function of the system is equal to:" |
| A. | " 1/s" |
| B. | " 1/s(s+1)" |
| C. | " 1/(s+1)" |
| D. | " s/(s+1)" |
| Answer» D. " s/(s+1)" | |
| 3. |
" The transfer function of any stable system which has no zeros or poles in the right half of the s-plane is said to be:" |
| A. | " Minimum phase transfer function" |
| B. | " Non-minimum phase transfer function" |
| C. | " Minimum phase frequency response function" |
| D. | " Minimum gain transfer function" |
| Answer» B. " Non-minimum phase transfer function" | |
| 4. |
" A differentiator is usually not a part of a control system because it" |
| A. | " Reduces damping" |
| B. | " Reduces the gain margin" |
| C. | " Increases input noise" |
| D. | " Increases error" |
| Answer» D. " Increases error" | |
| 5. |
" In an open loop control system" |
| A. | " Output is independent of control input" |
| B. | " Output is dependent on control input" |
| C. | " Only system parameters have effect on the control output" |
| D. | " None of the mentioned" |
| Answer» B. " Output is dependent on control input" | |
| 6. |
" ______________ are the techniques for converting general state models into canonical one." |
| A. | Observable |
| B. | Controllable |
| C. | Diagoanlization |
| D. | Cannonical |
| Answer» D. Cannonical | |
| 7. |
" ____________directly converts temperature into voltage." |
| A. | " Thermocouple" |
| B. | " Potentiometer" |
| C. | " Gear train" |
| D. | " LVDT" |
| Answer» B. " Potentiometer" | |
| 8. |
" The tacho meter has sensitivity of 5V/1000rpm. The gain constant of the tacho meter is:" |
| A. | " 0.48V/rad/sec" |
| B. | " 0.048V/rad/sec" |
| C. | " 4.8V/rad/sec" |
| D. | " 48V/rad/sec" |
| Answer» C. " 4.8V/rad/sec" | |
| 9. |
" If the initial conditions are inherently zero, what does it physically mean?" |
| A. | " The system is at rest but stores energy" |
| B. | " The system is working but does not store energy" |
| C. | " The system is at rests or no energy is stored in any of its parts" |
| D. | " The system is working with zero reference input" |
| Answer» D. " The system is working with zero reference input" | |
| 10. |
" Consider the following servomotors:1. AC-two phase servomotor2. DC servomotor3. Hydraulic servomotor4. Pneumatic servomotorThe correct sequence of these servomotor in increasing order of power handling capacity is:" |
| A. | " 2,4,3,1" |
| B. | " 4,2,3,1" |
| C. | " 2,4,1,3" |
| D. | " 4,2,1,3" |
| Answer» D. " 4,2,1,3" | |
| 11. |
" Open loop transfer function of a system having one zero with a positive real value is called." |
| A. | " Zero phase function" |
| B. | " Negative phase function" |
| C. | " Positive phase function" |
| D. | " Non-minimum phase function" |
| Answer» E. | |
| 12. |
" A tachometer is used as an inner loop in a position control servo-system. What is the effect of feedback on the gain of the sub-loop incorporating tachometer and in the effective time constant of the system?" |
| A. | " Both are reduced" |
| B. | " Gain is reduced but the time constant is increased" |
| C. | " Gain is increased but the time constant is reduced" |
| D. | " Both are increased" |
| Answer» B. " Gain is reduced but the time constant is increased" | |
| 13. |
" If the gain of the critical damped system is increased it will behave as" |
| A. | " Oscillatory" |
| B. | " Critically damped" |
| C. | " Overdamped" |
| D. | " Underdamped" |
| Answer» E. | |
| 14. |
" Error detector:" |
| A. | " Armature controlled FHP DC motor" |
| B. | " A pair of synchronous transmitter and control transformer" |
| C. | " Tach generator" |
| D. | " Amplidyne" |
| Answer» B. " A pair of synchronous transmitter and control transformer" | |
| 15. |
" In a closed loop for which the output is the speed of the motor, the output rate control can be used to:" |
| A. | " Limit the speed of the motor" |
| B. | " Limit the torque output of the motor" |
| C. | " Reduce the damping of the system" |
| D. | " Limit the acceleration of the motor" |
| Answer» B. " Limit the torque output of the motor" | |
| 16. |
" When human being tries to approach an object, his brain acts as," |
| A. | " An error measuring device" |
| B. | " A controller" |
| C. | " An actuator" |
| D. | " An amplifier" |
| Answer» C. " An actuator" | |
| 17. |
" Consider the function F (s)= 5/s(s2+3s+2), the initial value of f(t) is:" |
| A. | " 5" |
| B. | " 5/2" |
| C. | " 5/3" |
| D. | " 0" |
| Answer» E. | |
| 18. |
" Assertion (A): The stator winding of a control transformer has higher impedance per phaseReason (R): The rotor of control transformer is cylindrical in shape." |
| A. | " Both A and R are true and R is correct explanation of A" |
| B. | " Both A and R are true and R is not correct Explanation of A" |
| C. | " A is True and R is false" |
| D. | " A is False and R is true" |
| Answer» C. " A is True and R is false" | |
| 19. |
" The transfer function of a LTI system is given as 1/(s+1). What is the steady-state value of the unit-impulse response?" |
| A. | " 0" |
| B. | " 1" |
| C. | " 2" |
| D. | " Infinite" |
| Answer» B. " 1" | |
| 20. |
" The values of the characteristic equation is given by:" |
| A. | " Eigen values" |
| B. | " State matrix" |
| C. | " Eigen vector" |
| D. | " None of the mentioned" |
| Answer» B. " State matrix" | |
| 21. |
" Consider the following statements relating to synchro's:1. The rotor of the control transformer is either disc shaped2. The rotor of the transmitter is so constructed as to have a low magnetic reluctance3. Transmitter and control transformer pair is used as an error detectorWhich of these statements are correct?" |
| A. | " 1,2 and3" |
| B. | " 1 and 2" |
| C. | " 2 and3" |
| D. | " 1 and 3" |
| Answer» D. " 1 and 3" | |
| 22. |
" The matrix constructed by placing the Eigen vectors together is diagonalizing matrix." |
| A. | " True" |
| B. | " False" |
| Answer» B. " False" | |
| 23. |
" An electric motor is developing 10KW at a speed of 900rpm. The torque available at the shaft is:" |
| A. | " 106 N-m" |
| B. | " 66 N-m" |
| C. | " 1600 N-m" |
| D. | " 90 N-m" |
| Answer» B. " 66 N-m" | |
| 24. |
The transfer function for the state representation of the continuous time LTI system:dq(t)/dt=Aq(t)+Bx(t)Y(t)=Cq(t)+Dx(t)is given by: |
| A. | C(sI-A)-1B+D |
| B. | B(sI-A)-1B+D |
| C. | C(sI-A)-1B+A |
| D. | D(sI-A)-1B+C |
| Answer» B. B(sI-A)-1B+D | |
| 25. |
" Which of the following can be used as a tacho generator in control systems?" |
| A. | " Microsyn" |
| B. | " DC servomotor" |
| C. | " AC servomotor" |
| D. | " Magnetic Amplifier" |
| Answer» D. " Magnetic Amplifier" | |
| 26. |
" In case of DC servomotor the back-emf is equivalent to an 'electric friction' which tends to :" |
| A. | " Improve stability of the motor" |
| B. | " Slowly decrease stability of the motor" |
| C. | " Vary rapidly decrease stability of the motor" |
| D. | " Have no effect on stability" |
| Answer» B. " Slowly decrease stability of the motor" | |
| 27. |
" Assertion (A): Many of the linear control system transfer function do not have poles or zeroes in the right half s-plane.Reason (R): These are called minimum phase transfer function." |
| A. | " Both A and R are true and R is correct explanation of A" |
| B. | " Both A and R are true and R is not correct Explanation of A" |
| C. | " A is True and R is false" |
| D. | " A is False and R is true" |
| Answer» B. " Both A and R are true and R is not correct Explanation of A" | |
| 28. |
" Assertion (A): In a shunt regulator, the control element is connected in shunt with the load to achieve constant output voltage.Reason (R): The impedance of the control element varies to keep the total current flowing through the load and the control element constant." |
| A. | " Both A and R are true and R is correct explanation of A" |
| B. | " Both A and R are true and R is not correct Explanation of A" |
| C. | " A is True and R is false" |
| D. | " A is False and R is true" |
| Answer» D. " A is False and R is true" | |
| 29. |
" Which of the following is an electromechanical device ?" |
| A. | " Induction relay" |
| B. | " Thermocouple" |
| C. | " LVDT" |
| D. | " Any of the mentioned" |
| Answer» D. " Any of the mentioned" | |
| 30. |
" Assertion (A): In the error detector configuration using a synchro transmitter and synchro control transformer, the latter is connected to the error amplifier.Reason (R): Synchro control transformer has almost a uniform reluctance path between the rotor and the stator." |
| A. | " Both A and R are true and R is correct explanation of A" |
| B. | " Both A and R are true and R is not correct Explanation of A" |
| C. | " A is True and R is false" |
| D. | " A is False and R is true" |
| Answer» D. " A is False and R is true" | |
| 31. |
" The diagonalizing matrix is also known as:" |
| A. | " Eigen matrix" |
| B. | " Modal matrix" |
| C. | " Constant matrix" |
| D. | " State matrix" |
| Answer» C. " Constant matrix" | |
| 32. |
" State model is generally not suitable for measuring:" |
| A. | " Investigation of system properties" |
| B. | " Evaluation of time response" |
| C. | " Real variables" |
| D. | " Both a and b" |
| Answer» E. | |
| 33. |
" State space analysis is applicable for non-linear systems and for multiple input and output systems." |
| A. | " True" |
| B. | " False" |
| Answer» B. " False" | |
| 34. |
" Which of the following can be measured by LVDT?" |
| A. | " Displacement" |
| B. | " Velocity" |
| C. | " Acceleration" |
| D. | " All of the mentioned" |
| Answer» E. | |
| 35. |
" The closed loop transfer function of a unity negative feedback system is 100/(s2+8s+100). Its open loop transfer function is:" |
| A. | " 100/s+8" |
| B. | " 1/s2+8s" |
| C. | " 100/s2-8s" |
| D. | " 100/s2+8s" |
| Answer» E. | |
| 36. |
" For two-phase AC servomotor, if the rotor's resistance and reactance are respectively R and X, its length and diameter are respectively L and D then," |
| A. | " X/R and L/D are both small" |
| B. | " X/R is large but L/D is small" |
| C. | " X/R is small but L/D is large" |
| D. | " X/R and L/D are both large" |
| Answer» D. " X/R and L/D are both large" | |
| 37. |
" In a control system integral error compensation _______ steady state error" |
| A. | " Increases" |
| B. | " Minimizes" |
| C. | " Does not have any effect on" |
| D. | " All of the mentioned" |
| Answer» C. " Does not have any effect on" | |
| 38. |
" Servomotor:" |
| A. | " Armature controlled FHP DC motor" |
| B. | " A pair of synchronous transmitter and control transformer" |
| C. | " Tach generator" |
| D. | " Amplidyne" |
| Answer» C. " Tach generator" | |
| 39. |
" The transfer function technique is considered as inadequate under which of the following conditions?" |
| A. | " Systems having complexities and non-linearity's" |
| B. | " Systems having stability problems" |
| C. | " Systems having multiple input disturbances" |
| D. | " All of the mentioned" |
| Answer» E. | |
| 40. |
" Assertion (A): Transfer function approach has limitation that it reveals only the system output for a input and provides no information regarding the internal state of the system.Reason (R): There may be situations where the output of a system is stable and yet some of the system elements may have a tendency to exceed their specified ratings." |
| A. | " Both A and R are true and R is correct explanation of A" |
| B. | " Both A and R are true but R is not correct explanation of A" |
| C. | " A is true but R is False" |
| D. | " A is False but R is True" |
| Answer» B. " Both A and R are true but R is not correct explanation of A" | |
| 41. |
" In servo-system, the device used for derivative feedback is known as:" |
| A. | " Synchro" |
| B. | " Servomotor" |
| C. | " Potentiometer" |
| D. | " Tacho generator" |
| Answer» E. | |
| 42. |
" State models presented employed:" |
| A. | " Physical variables" |
| B. | " Phase variables" |
| C. | " Canonical variables" |
| D. | " All of the mentioned" |
| Answer» E. | |
| 43. |
" Amplifier:" |
| A. | " Armature controlled FHP DC motor" |
| B. | " A pair of synchronous transmitter and control transformer" |
| C. | " Tach generator" |
| D. | " Amplidyne" |
| Answer» E. | |