MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A signal other than the reference input that tends to affect the value of controlled variable is known as |
| A. | Disturbance |
| B. | Command |
| C. | Control element |
| D. | Reference input |
| Answer» B. Command | |
| 2. |
On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ? |
| A. | Frequency |
| B. | Loop gain |
| C. | Forward gain |
| D. | All of the above |
| Answer» E. | |
| 3. |
Hydraulic torque transmission system is analog of |
| A. | amplidyne set |
| B. | resistance-capacitance parallel circuit |
| C. | motor-generator set |
| D. | any of the above |
| Answer» D. any of the above | |
| 4. |
Which of the following is the input to a controller ? |
| A. | Servo signal |
| B. | Desired variable value |
| C. | Error signal |
| D. | Sensed signal |
| Answer» B. Desired variable value | |
| 5. |
In electrical pneumatic system analogy the current is considered analogous to |
| A. | velocity |
| B. | pressure |
| C. | air flow |
| D. | air flow rate |
| Answer» E. | |
| 6. |
Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal. |
| A. | acceleration |
| B. | velocity |
| C. | position |
| D. | all of the above |
| Answer» E. | |
| 7. |
Directly converts temperature into voltage. |
| A. | Thermocouple |
| B. | Potentiometer |
| C. | Gear train |
| D. | LVDT |
| E. | None of the above |
| Answer» B. Potentiometer | |
| 8. |
The on-off controller is a _____ system. |
| A. | digital |
| B. | linear |
| C. | non-linear |
| D. | discontinuous |
| Answer» D. discontinuous | |
| 9. |
Which of the following is exhibited by Root locus diagrams ? |
| A. | The poles of the transfer function for a set of parameter values |
| B. | The bandwidth of the system |
| C. | The response of a system to a step input |
| D. | The frequency response of a system |
| E. | None of the above |
| Answer» B. The bandwidth of the system | |
| 10. |
A.C. servomotor is basically a |
| A. | universal motor |
| B. | single phase induction motor |
| C. | two phase induction motor |
| D. | three phase induction motor |
| Answer» D. three phase induction motor | |
| 11. |
Is a closed loop system. |
| A. | Auto-pilot for an aircraft |
| B. | Direct current generator |
| C. | Car starter |
| D. | Electric switch |
| Answer» B. Direct current generator | |
| 12. |
With feed back _____ reduces. |
| A. | system stability |
| B. | system gain |
| C. | system stability and gain |
| D. | none of the above |
| Answer» C. system stability and gain | |
| 13. |
Temperature is analogous to |
| A. | Voltage |
| B. | Flux |
| C. | Charge |
| D. | None of the above |
| Answer» B. Flux | |
| 14. |
Which of the following is used to obtain output position in a position control system? |
| A. | Strain gauge |
| B. | Load cell |
| C. | Synchro |
| D. | Thermistor |
| Answer» C. Synchro | |
| 15. |
Which dc servomotor requires strongest permanent magnet? |
| A. | Slotted armature |
| B. | Surface wound armature |
| C. | Surface wound with stationary rotor |
| D. | Either A or B |
| Answer» D. Either A or B | |
| 16. |
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if |
| A. | The gain is increased beyond upper critical value |
| B. | The gain is decreased below lower critical value |
| C. | Both A and B |
| D. | None of the above |
| Answer» D. None of the above | |
| 17. |
DC tachogenerator can be used in |
| A. | Speed control system |
| B. | Position control system |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 18. |
The addition of a pole to the open loop transfer function pulls the root locus |
| A. | To the right |
| B. | To the left and making the system more stable |
| C. | Towards right or left depending on the position of new pole |
| D. | None of the above |
| Answer» B. To the left and making the system more stable | |
| 19. |
For any transfer function, the constant phase angle loci are |
| A. | A family of circles |
| B. | A family of straight lines |
| C. | Either (a) or (b) |
| D. | Neither (a) nor (b) |
| Answer» B. A family of straight lines | |
| 20. |
The permanent magnet field system of brushless dc servo- motor is generally on |
| A. | Stator |
| B. | Rotor |
| C. | Partly on stator and partly on rotor |
| D. | Either (a) or (b) |
| Answer» C. Partly on stator and partly on rotor | |
| 21. |
The distance of poles from origin depends on |
| A. | Uqndamped natural frequency |
| B. | Damping ratio |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» B. Damping ratio | |
| 22. |
Bandwidth is proportional to speed of response. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 23. |
In a simple on-off controller with differential gap, the magnitude of differential gap determines |
| A. | The level of accuracy |
| B. | The life of controller |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» D. Neither (a) nor (b) | |
| 24. |
If poles lie in first quadrant, damping ratio is |
| A. | 1 |
| B. | More than 1 |
| C. | less than 1 |
| D. | Zero |
| Answer» D. Zero | |
| 25. |
If the poles lie in second quadrant, damping ratio is |
| A. | 1 |
| B. | less than 1 |
| C. | zero |
| D. | more than 1 |
| Answer» C. zero | |
| 26. |
In force current analogy, displacement x is analogous to |
| A. | Charge |
| B. | Magnetic flux linkage |
| C. | Electrostatic energy |
| D. | Voltage |
| Answer» C. Electrostatic energy | |
| 27. |
Nyquist stability criterion uses open loop frequency response characteristics. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 28. |
Which control action can never be used alone? |
| A. | Proportional |
| B. | Derivative |
| C. | Integral |
| D. | Both (b) and (c) |
| Answer» C. Integral | |
| 29. |
Magnetic amplifier is used for |
| A. | Voltage amplification |
| B. | Power amplification |
| C. | Current amplification |
| D. | Frequency amplification |
| Answer» C. Current amplification | |
| 30. |
Nichols chart consists of |
| A. | Constant magnitude loci |
| B. | Constant phase angle loci |
| C. | Magnitude and phase angle loci in log-magnitude versus phase diagram |
| D. | None of the above |
| Answer» D. None of the above | |
| 31. |
In force current analogue, mechanical mobility is analogous to |
| A. | Impedance Z |
| B. | Admittance Y |
| C. | Reactance X |
| D. | Conductance G |
| Answer» B. Admittance Y | |
| 32. |
The sensor generally used in incremental optical encoder is |
| A. | LED |
| B. | LCD |
| C. | Photodiode |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 33. |
The poles with greater displacement from the real axis correspond to |
| A. | Higher frequencies of oscillations |
| B. | Stable response |
| C. | Lower frequencies of oscillations |
| D. | Unbounded output |
| Answer» B. Stable response | |
| 34. |
Which of the following is open loop system? |
| A. | Wind screen wiper |
| B. | Aqualing |
| C. | Respiratory system of animal |
| D. | System for controlling antirocket missiles |
| Answer» B. Aqualing | |
| 35. |
In a two phasor servomotor, the direction of rotation of the rotating field depends on |
| A. | Magnitudes of voltages applied to the two stator windings |
| B. | Phase relation of voltages applied to the two stator windings |
| C. | Both magnitude and phase relationship of voltages applied to the two stator windings |
| D. | None of the above |
| Answer» C. Both magnitude and phase relationship of voltages applied to the two stator windings | |
| 36. |
A system is highly oscillatory if |
| A. | Gain margin is high |
| B. | Gain margin is close to 1 |
| C. | Gain margin is close to 1 or phase margin is zero |
| D. | Gain margin is high and phase margin is 180° |
| Answer» D. Gain margin is high and phase margin is 180° | |
| 37. |
M circles are symmetrical with respect to |
| A. | Real and imaginary axis |
| B. | M = 1 straight line and real axis |
| C. | M = 1 straight line and imaginary axis |
| D. | M = 1 straight line |
| Answer» C. M = 1 straight line and imaginary axis | |
| 38. |
In control systems the output of sensor usually, is |
| A. | Analog electrical signal |
| B. | Digital electrical signal |
| C. | Mechanical signal |
| D. | Analog or digital electrical signal |
| Answer» E. | |
| 39. |
Which of the following can be used as a rotating amplifier in a control system?1. Amplidyne2. Separately excited dc generator3. Synchro4. Self excited dc generator |
| A. | 3 and 4 |
| B. | 1 and 2 |
| C. | 1, 2 and 3 |
| D. | All |
| Answer» C. 1, 2 and 3 | |
| 40. |
The effect of adding poles and zeros can be determined quickly by |
| A. | Nichols chart |
| B. | Nyquist plot |
| C. | Bode plot |
| D. | Root locus |
| Answer» D. Root locus | |
| 41. |
For type 1 system the velocity lag error is |
| A. | Inversely proportional to bandwidth of system |
| B. | Directly proportional to gain constant |
| C. | Inversely proportional to gain constant |
| D. | Independent of gain constant |
| Answer» D. Independent of gain constant | |
| 42. |
If any term in the first column of a Routh array becomes zero, then |
| A. | Routh criterion cannot be used to determine stability |
| B. | Routh criterion can be used by substituting a small positive number for zero and completing the array |
| C. | Routh criterion can be used by substituting a big positive number for zero and completing the array |
| D. | Routh criterion can be used by substituting a small negative number for zero and complet-ing the array |
| Answer» C. Routh criterion can be used by substituting a big positive number for zero and completing the array | |
| 43. |
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 44. |
Integral control action |
| A. | Removes offset |
| B. | May lead to oscillatory response |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» D. Neither (a) nor (b) | |
| 45. |
In Bode plots the frequency at which two asymptotes meet is called corner frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 46. |
In the field controlled motor the entire damping comes from |
| A. | Armature resistance |
| B. | Back emf |
| C. | Motor friction and load |
| D. | Field resistance |
| Answer» D. Field resistance | |
| 47. |
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 48. |
Nichol’s chart is symmetric about – 180° axis. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 49. |
Robotic manipulator arms mostly use |
| A. | Hydraulic actuator |
| B. | Pneumatic actuator |
| C. | Electric motor actuator |
| D. | None of the above |
| Answer» D. None of the above | |
| 50. |
Transport lag usually exists in |
| A. | Thermal systems |
| B. | Hydraulic systems and thermal systems |
| C. | Pneumatic systems |
| D. | Thermal, hydraulic and pneumatic systems |
| Answer» E. | |