electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
6151. Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ___________ input signal?
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A. position

B. acceleration

C. velocity

D. all of the above
6152. Velocity error constant of a system is measured when the input to the system is unit ___________ function?
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A. parabolic

B. step

C. impulse

D. ramp
6153. Phase margin of a system is used to specify which of the following ?
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A. Absolute stability

B. Time response

C. Frequency response

D. Relative stability
6154. The initial response when tne output is not equal to input is called_____________?
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A. Either of the above

B. Transient response

C. Error response

D. Dynamic response

6155. In force-voltage analogy, velocity is analogous to______________?
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A. capacitance

B. current

C. charge

D. inductance

6156. Which of the following devices is used for conversion of co-ordinates ?
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A. Synchro-resolver

B. Selsyn

C. Microsyn

D. Synchro-transformer

6157. In a system zero initial condition means that______________?
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A. The system is working with zero stored energy

B. The system is working with zero reference signal

C. The system is at rest and no energy is stored in any of its components
6158. The second derivative input signals modify which of the following ?
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A. None of the above

B. The time constant of the system

C. The gain of the system

D. Damping of the system

E. The time constant and suppress the oscillations
6159. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?
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A. The system is relatively stable

B. The system is highly stable

C. None of the above

D. The system is highly oscillatory
6160. Pressure error can be measured by which of the following ?
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A. Differential bellows and straingauge

B. Strain gauge and potentiometer

C. Strain gauge

D. Selsyn

6161. ________________directly converts temperature into voltage?
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A. Thermocouple

B. Gear train

C. None of the above

D. Potentiometer

E. LVDT

6162. In a system low friction co-efficient facilitates___________?
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A. increased speed of response

B. increased velocity lag error

C. reduced time constant of the system

D. reduced velocity lag error
6163. The transient response of a system is mainly due to________________?
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A. stored energy

B. friction

C. inertia forces

D. internal forces

6164. A signal other than the reference input that tends to affect the value of controlled variable is known as_________________?
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A. reference input

B. control element

C. command

D. disturbance
6165. A conditionally stable system exhibits poor stability at______________?
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A. none of the above

B. reduced values of open loop gain

C. increased values of open loop gain

D. low frequencies

6166. The type 2 system has __________ at the origin?
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A. simple pole

B. two poles

C. no net pole

D. net pole

6167. ____________is a part of the human temperature control system?
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A. Leg movement

B. Digestive system

C. Perspiration system

D. Ear

6168. The effect of error damping is to______________?
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A. none of the above

B. provide larger settling lime

C. reduce steady state error

D. delay the response

E. any of the above

6169. The type 0 system has ___________ at the origin?
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A. two poles

B. none of the above

C. no pole

D. net pole

E. simple pole

6170. Mass, in force-voltage analogy, is analogous to________________?
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A. current

B. resistance

C. inductance

D. charge

6171. An amplidyne can give which of the following characteristics ?
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A. None of the above

B. Constant current as well as constant voltage

C. Constant voltage

D. Constant current

E. Constant current, constant voltage and constant power
6172. _______________is a closed loop system?
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A. Electric switch

B. Direct current generator

C. Auto-pilot for an aircraft

D. Car starter

6173. As a result of introduction of negative feedback which of the following will not decrease ?
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A. Band width

B. Distortion

C. Overall gain

D. Instability

6174. __________________can be extended to systems which are time-varying ?
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A. Bode-Nyquist stability methods

B. Root locus design

C. Transfer functions

D. State model representatives
6175. The transfer function is applicable to which of the following ?
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A. Linear systems

B. Linear and time-variant systems

C. Non-linear systems

D. Linear and time-in variant systems

E. None of the above

6176. _____________is the reference input minus the primary feedback?
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A. Manipulated variable

B. Primary feedback

C. Zero sequence

D. Actuating signal
6177. If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is_____________?
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A. always unstable

B. not necessarily stable

C. unstable

D. stable

E. any of the above

6178. Which of the following statements is not necessarily correct for open control system ?
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A. Generally free from problems of non-linearities

B. Input command is the sole factor responsible for providing the control action

C. Less expensive

D. Presence of non-linearities causes malfunctioning
6179. The type 1 system has _________ at the origin?
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A. no pole

B. two poles

C. simple pole

D. net pole

6180. A.C. servomotor is basically a____________?
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A. single phase induction motor

B. two phase induction motor

C. universal motor

D. three phase induction motor

6181. By which of the following the control action is determined when a man walks along a path ?
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A. Brain

B. Eyes

C. Legs

D. Hands

6182. In liquid level and electrical system analogy, voltage is considered analogous to_____________?
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A. none of the above

B. liquid flow

C. liquid flow rate

D. head
6183. When the initial conditions of a system are specified to be zero it implies that the system is______________?
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A. working normally with zero reference input

B. working normally with reference input

C. at rest but stores energy

D. at rest without any energy stored in it

6184. Addition of zeros in transfer function causes which of the following ?
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A. Lead-lag compensation

B. Lag-compensation

C. Lead-compensation

D. None of the above

6185. In thermal-electrical analogy charge is considered analogous to_______________?
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A. none of the above

B. reciprocal of temperature

C. reciprocal of heat flow

D. heat flow

E. temperature
6186. Which of the following is exhibited by Root locus diagrams ?
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A. The bandwidth of the system

B. The frequency response of a system

C. The poles of the transfer function for a set of parameter values

D. None of the above

E. The response of a system to a step input

6187. In a stable control system backlash can cause which of the following ?
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A. Poor stability at reduced values of open loop gain

B. Underdamping

C. Overdamping

D. Low-level oscillations
6188. Zero initial condition for a system means_______________?
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A. zero stored energy

B. system is at rest and no energy is stored in any of its components

C. input reference signal is zero

D. ne initial movement of moving parts

6189. Any externally introduced signal affecting the controlled output is called a______________?
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A. stimulus

B. signal

C. feedback

D. gain control

6190. Regenerative feedback implies feedback with_______________?
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A. negative sign

B. step input

C. positive sign

D. oscillations

6191. In pneumatic control systems the control valve used as final control element converts____________?
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A. none of the above

B. electric signal to pressure signal

C. position change to pressure signal

D. pressure signal to electric signal

E. pressure signal to position change
6192. In order to increase the damping of a badly underdamped system which of following compensators may be used ?
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A. Phase-lead

B. Phase-lag

C. Both A. and B.

D. Either A. and B.

E. None of the above

6193. _____________is not a final control element?
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A. Servomotor

B. Electropneumatic converter

C. Potentiometer

D. Control valve

6194. ____________technique is not applicable to nonlinear system ?
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A. Phase-plane representation

B. Nyquist Criterion

C. Quasi linearization

D. Functional analysis

6195. A control system with excessive noise, is likely to suffer from_______________?
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A. loss of gain

B. saturation in amplifying stages

C. vibrations

D. oscillations

6196. The output of a feedback control system must be a function of_________________?
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A. reference and output

B. reference and input

C. output and feedback signal

D. input and feedback signal

6197. In an open loop control system____________?
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A. None of the above

B. Only system parameters have effect on the control output

C. Output is dependent on control input

D. Output is independent of control input
6198. With feed back ____________ reduces?
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A. none of the above

B. system stability and gain

C. system stability

D. system gain
6199. signal will become zero when the feedback signal and reference signs are equal?
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A. Feedback

B. Input

C. Actuating

D. Reference

6200. A control system working under unknown random actions is called______________?
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A. adaptive control system

B. computer control system

C. stochastic control system

D. digital data system