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. |
For underdamped second order systems the rise time is the time required for the response to rise from |
| A. | 0% to 100% of its final value |
| B. | 10% to 90% of its final value |
| C. | 5% to 95% of its final value |
| D. | either (a) or (b) |
| Answer» B. 10% to 90% of its final value | |
| 2. |
If G(s) = 1/(s³+s²+1), there are |
| A. | two poles of G(s) in the left half plane |
| B. | two poles of G(s) in the right half plane |
| C. | three poles of G(s) in the right half plane |
| D. | four poles of G(s) in the right half plane |
| Answer» C. three poles of G(s) in the right half plane | |
| 3. |
For the system of given figure the closed loop transfer function |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 4. |
When time constant T in any factor is varied, the shapes of log magnitude and phase angle curves remain the same. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 5. |
For a stable system |
| A. | both phase and gain margin are negative |
| B. | both phase and gain margin are positive |
| C. | phase margin is positive but gain margin is negative |
| D. | gain margin is positive but phase margin is negative |
| Answer» C. phase margin is positive but gain margin is negative | |
| 6. |
The given figure shows dB magnitude plots for type 0, type 1 and type 2 systems. Out of these |
| A. | curves 1, 2, 3 are for type 0, 1, 2 systems respectively |
| B. | curves 1, 2, 3 are for type 2, 1, 0 systems respectively |
| C. | curves 1, 2, 3 are for type 1, 0, 2 systems respectively |
| D. | curves 1, 2, 3 are for type 1, 2, 0 systems respectively |
| Answer» B. curves 1, 2, 3 are for type 2, 1, 0 systems respectively | |
| 7. |
In a synchro transmitter, which coil acts as primary? |
| A. | Rotor |
| B. | Stator |
| C. | Partly rotor and partly stator |
| D. | Tertiary |
| Answer» B. Stator | |
| 8. |
A stepper motor is essentially |
| A. | a synchronous motor |
| B. | induction motor |
| C. | dc motor |
| D. | either (b) or (c) |
| Answer» B. induction motor | |
| 9. |
Assertion (A): Points in the s plane at which function G(s) is not analytic are called singular, points.Reason (R): Singular points at which the function G(s) or its derivative approach infinity are called poles. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» C. A is correct but R is wrong | |
| 10. |
For a second order system the damping factor is varied from 0 to 1. The locus of poles is |
| A. | a straight line on imaginary axis |
| B. | a straight line on real axis |
| C. | a semi circle |
| D. | a circle |
| Answer» D. a circle | |
| 11. |
In the given figure C(s)/U(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 12. |
For type 0 system the starting point (i.e. ω = 0) of polar plot is finite and is on positive real axis. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 13. |
The ac motor used in servo applications is |
| A. | single phase induction motor |
| B. | two phase induction motor |
| C. | 3 phase induction motor |
| D. | synchronous motor |
| Answer» C. 3 phase induction motor | |
| 14. |
For overdamped systems a quadratic factor in transfer function can be replaced by two first order factors with real poles |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 15. |
In Bode diagram (log magnitude plot) the factor 1/jω in the transfer function gives a line having slope |
| A. | -20 dB per octave |
| B. | -10 dB per octave |
| C. | -6 dB per octave |
| D. | -2 dB per octave |
| Answer» D. -2 dB per octave | |
| 16. |
A lag compensator is essentially a |
| A. | low pass filter |
| B. | high pass filter |
| C. | band pass filter |
| D. | either (a) or (b) |
| Answer» B. high pass filter | |
| 17. |
In case of synchro error detector the electrical zero position of control transformer is obtained when angular displacement between rotors is |
| A. | zero |
| B. | 45° |
| C. | 90° |
| D. | 180° |
| Answer» D. 180° | |
| 18. |
Assertion (A): When the phase margin of a control system is improved using a lead network, noise transmission increases.Reason (R): Phase lead compensation increases bandwidth. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 19. |
The given figure shows a control system. The maximum value of gain for which the system is stable is |
| A. | √3 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 20. |
For a second order system ωn is natural frequency, ωd is frequency of damped oscillations and ζ is damping factor. Then |
| A. | ωd = ωn ξ |
| B. | ωd = ωn (1 - ξ)² |
| C. | ωd = ωn (1 - ξ)^0.5 |
| D. | ωd = ωn (1 - ξ²)^0.5 |
| Answer» E. | |
| 21. |
An RLC series circuit has following equation. If poles p1 and p1* are close to jω axis, then |
| A. | resonant frequency is high |
| B. | Q is high |
| C. | bandwidth is large |
| D. | Q is low |
| Answer» D. Q is low | |
| 22. |
A system has high gain and phase margin. The system is |
| A. | very stable |
| B. | sluggish |
| C. | very stable and sluggish |
| D. | oscillatory |
| Answer» D. oscillatory | |
| 23. |
In the given figure, the combinations of two non touching loops is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 24. |
The polar plot of a transfer function passes through (-1, 0) point. The gain margin is |
| A. | zero |
| B. | - 1 dB |
| C. | 1 dB |
| D. | infinity |
| Answer» B. - 1 dB | |
| 25. |
For the op-amp circuit of the given figure, Eo(s)/Ei(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 26. |
Assertion (A): Industrial robots improve productivity.Reason (R): Robots can handle monotonous and complex jobs without error in operation. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 27. |
A system has two poles as shown in the given figure. The zeros are at infinity. If input is unit step, the steady state output is |
| A. | 1/4 |
| B. | 1/2 |
| C. | 1/√2 |
| D. | 1 |
| Answer» E. | |
| 28. |
Assertion (A): If points at infinity are included, G(s) has same number of poles and zeros.Reason (R): The function G(s) = K(s+2) / (s+5)² has a zero at s = - 2. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» C. A is correct but R is wrong | |
| 29. |
G(s) = 1/(s² + 0.2s + 1). It is required that response settles to within 2% of final value for a step input. The settling time is |
| A. | 20 sec |
| B. | 40 sec |
| C. | 35 sec |
| D. | 45 sec |
| Answer» C. 35 sec | |
| 30. |
A unity feedback system has the following open loop frequency response. The gain margin and phase margin are |
| A. | 0 dB, -17° |
| B. | 3.86 dB, -180° |
| C. | 0 dB, 10° |
| D. | 3.86 dB, 10° |
| Answer» E. | |
| 31. |
For a quadratic factor in transfer function the phase angle is not a function of damping factor. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 32. |
For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot) |
| A. | is -90° |
| B. | is +90° |
| C. | depends on the damping factor |
| D. | none of the above |
| Answer» B. is +90° | |
| 33. |
If ΔP is pressure difference, A is area of each flat surface, K is stiffness and Δx is displacement of movable surface from reference of bellows, then |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 34. |
Nyquist plot provides information about absolute stability as well as relative stability. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 35. |
Assertion (A): The root locus of a control system is symmetrical about real axis.Reason (R): For all polynomials with real coefficients, complex poles always occur in conjugate pairs. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 36. |
The transfer function given by following equation can be for |
| A. | lead compensator |
| B. | lag compensator |
| C. | both (a) and (b) |
| D. | either (a) or (b) |
| Answer» C. both (a) and (b) | |
| 37. |
Assertion (A): Potentiometers can not be used as error detectors in position control systems.Reason (R): The resolution of a potentiometer places an upper limit on its accuracy |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» E. | |
| 38. |
Time rate of change in heat energy is analogous to |
| A. | voltage |
| B. | charge |
| C. | current |
| D. | voltage gradient |
| Answer» D. voltage gradient | |
| 39. |
Given figure shows a unity feedback system. The ratio of time constants for open loop and closed loop response are |
| A. | 1 : 1 |
| B. | 2 : 1 |
| C. | 3 : 2 |
| D. | 2 : 3 |
| Answer» E. | |
| 40. |
A proportional controller is basically |
| A. | an amplifier with adjustable gain |
| B. | an integrating amplifier |
| C. | an amplifier with infinite gain |
| D. | an amplifier with almost zero gain |
| Answer» B. an integrating amplifier | |
| 41. |
The angular location of poles depends on |
| A. | undamped natural frequency |
| B. | damping ratio |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) and (b) | |
| 42. |
Nichols chart consists of M and N locii in log magnitude versus phase diagram. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 43. |
In a two phase servomotor the voltages applied to the two stator windings |
| A. | are equal in magnitude and are in phase |
| B. | are unequal in magnitude but are in phase |
| C. | are equal in magnitude but have a phase difference of 90° |
| D. | are unequal in magnitude and have a phase difference of 90° |
| Answer» E. | |
| 44. |
For the block diagram of in the given figure, the transfer function C(s)/R(s) is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 45. |
In position control system the device used for providing rate feedback voltage is |
| A. | potentiometer |
| B. | synchro-transmitter |
| C. | synchro-transformer |
| D. | tacho generator |
| Answer» E. | |
| 46. |
For a following factor, the log |
| A. | is a straight line with slope 20 dB/decade |
| B. | is a straight line with slope 0 dB/decade |
| C. | is a straight line with slope - 20 dB/decade |
| D. | is a straight line with slope - 40 dB/decade |
| Answer» E. | |
| 47. |
If block diagrams of the given figure (a) and (b) are to be equivalent, then |
| A. | G2 = G1 |
| B. | G2 = -G1 |
| C. | G2 = 1/G1 |
| D. | G2 = -1/G1 |
| Answer» B. G2 = -G1 | |
| 48. |
A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of |
| A. | -200 dB/decade |
| B. | -240 dB/decade |
| C. | -280 dB/decade |
| D. | -320 dB/decade |
| Answer» B. -240 dB/decade | |
| 49. |
Gas flow resistance is defined as |
| A. | (change in gas pressure difference) / (change in gas flow rate) |
| B. | (change in gas flow rate) / (change in gas pressure difference) |
| C. | (change in gas pressure difference) x (change in gas flow rate) |
| D. | none of the above |
| Answer» B. (change in gas flow rate) / (change in gas pressure difference) | |
| 50. |
The phase angle of 1/jω is constant and equal to - 90° for all values of ω |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |