MCQOPTIONS
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MCQOPTIONS
This section includes 54 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
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) | |
| 4. |
In Bode plots the frequency at which two asymptotes meet is called corner frequency.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
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 | |
| 6. |
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 | |
| 7. |
A lag compensator%! |
| A. | Speeds up the transient response of the system |
| B. | Improves steady state behavior of the system |
| C. | Improves steady state behavior and speeds up the transient response of the system |
| D. | Improves steady state behavior and preserves the transient response of the system |
| Answer» E. | |
| 8. |
Which of the following features is not associated with Nichols chart?%! |
| A. | (0 dB, -180°) point on Nichols chart represent critical Point (-1, 0) |
| B. | It is symmetric about -180° |
| C. | M loci are centred about (0 dB, -180°) point |
| D. | The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system |
| Answer» E. | |
| 9. |
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
Lag compensation permits a high gain at low frequencies.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
In root locus analysis the breakaway and break in points%! |
| A. | lie on the real axis |
| B. | Either lie on the real axis or occur in complex conjugate pairs |
| C. | Always occur in complex conjugate pairs |
| D. | None of the above |
| Answer» C. Always occur in complex conjugate pairs | |
| 12. |
Nichol’s chart is symmetric about – 180° axis.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
Bandwidth is proportional to speed of response.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
Nyquist stability criterion uses open loop frequency response characteristics.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
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 | |
| 16. |
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) | |
| 17. |
Which control action can never be used alone?%! |
| A. | Proportional |
| B. | Derivative |
| C. | Integral |
| D. | Both (b) and (c) |
| Answer» C. Integral | |
| 18. |
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. | |
| 19. |
If poles lie in first quadrant, damping ratio is%! |
| A. | 1 |
| B. | More than 1 |
| C. | less than 1 |
| D. | Zero |
| Answer» D. Zero | |
| 20. |
Magnetic amplifier is used for%! |
| A. | Voltage amplification |
| B. | Power amplification |
| C. | Current amplification |
| D. | Frequency amplification |
| Answer» C. Current amplification | |
| 21. |
The relative stability of a system is given by%! |
| A. | Gain margin alone |
| B. | Phase margin alone |
| C. | Both phase and gain margins |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 22. |
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 | |
| 23. |
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 | |
| 24. |
A lead compensator%! |
| A. | Speeds up the transient response |
| B. | Increases the stability margin |
| C. | Increases the stability margin and speeds up the transient-response. |
| D. | None of the above |
| Answer» D. None of the above | |
| 25. |
In force current analogy, displacement x is analogous to%! |
| A. | Charge |
| B. | Magnetic flux linkage |
| C. | Electrostatic energy |
| D. | Voltage |
| Answer» C. Electrostatic energy | |
| 26. |
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 | |
| 27. |
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) | |
| 28. |
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 | |
| 29. |
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 | |
| 30. |
Temperature is analogous to%! |
| A. | Voltage |
| B. | Flux |
| C. | Charge |
| D. | None of the above |
| Answer» B. Flux | |
| 31. |
*$_The sensor generally used in incremental optical encoder is? |
| A. | LED |
| B. | LCD |
| C. | Photodiode |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 32. |
*$_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 | |
| 33. |
*$_Temperature is analogous to? |
| A. | Voltage |
| B. | Flux |
| C. | Charge |
| D. | None of the above |
| Answer» B. Flux | |
| 34. |
*$_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 | |
| 35. |
*/*_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 | |
| 36. |
*/*_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 | |
| 37. |
*/*_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. | |
| 38. |
*/*_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 | |
| 39. |
%_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 | |
| 40. |
%_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. | |
| 41. |
%_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 | |
| 42. |
%_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 | |
| 43. |
_Which of the following is open loop system?$? |
| A. | Wind screen wiper |
| B. | Aqualing |
| C. | Respiratory system of animal |
| D. | System for controlling antirocket missiles |
| Answer» B. Aqualing | |
| 44. |
_Which of the following can be used as a rotating amplifier in a control system?1. Amplidyne2. Separately excited dc generator 3. Synchro4. Self excited dc generator$? |
| A. | 3 and 4 |
| B. | 1 and 2 |
| C. | 1, 2 and 3 |
| D. | All |
| Answer» C. 1, 2 and 3 | |
| 45. |
_Which dc servomotor requires strongest permanent magnet?$? |
| A. | Slotted armature |
| B. | Surface wound armature |
| C. | Surface wound with stationary rotor |
| D. | Either A or B |
| Answer» D. Either A or B | |
| 46. |
_The permanent magnet field system of brushless dc servo- motor is generally on$? |
| 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 | |
| 47. |
In a two phasor servomotor, the direction of rotation of the rotating field depends on$? |
| A. | Magnitudes of voltages applied to the two stator windings |
| B. | Phase relation of voltages applied to the two stator windings |
| C. | Both magnitude and phase relationship of voltages applied to the two stator windings |
| D. | None of the above |
| Answer» C. Both magnitude and phase relationship of voltages applied to the two stator windings | |
| 48. |
The distance of poles from origin depends on$? |
| A. | Uqndamped natural frequency |
| B. | Damping ratio |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» B. Damping ratio | |
| 49. |
The effect of adding poles and zeros can be determined quickly by$? |
| A. | Nichols chart |
| B. | Nyquist plot |
| C. | Bode plot |
| D. | Root locus |
| Answer» D. Root locus | |
| 50. |
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if$? |
| 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 | |