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
6201. In a control system integral error compensation _________________ steady state error?
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A. any of the above

B. does not have any effect on

C. minimizes

D. increases

6202. In an automatic control system which of the following elements is not used ?
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A. Final control element

B. Oscillator

C. Error detector

D. Sensor

6203. Which of the following devices are commonly used as error detectors in instruments ?
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A. Any of the above

B. Vernistats

C. Resolvers

D. Microsyns

6204. The phase lag produced by transportation relays_____________?
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A. is independent of frequency

B. decreases linearly with frequency

C. increases linearly with frequency

D. is inversehproportional to frequency

6205. An increase in gain, in most systems, leads to_____________?
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A. larger damping ratio

B. smaller damping ratio

C. constant damping ratio

D. none of the above

6206. Transfer function of a system is used to calculate which of the following ?
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A. The order of the system

B. The output for any given input

C. The steady state gain

D. The time constant

6207. On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?
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A. All of the above

B. Forward gain

C. Loop gain

D. Frequency

6208. With feed back __________ reduces?
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A. system gain

B. system stability and gain

C. system stability

D. none of the above

6209. The position and velocity errors of a type-2 system are_____________?
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A. zero, zero

B. zero, constant

C. constant, infinity

D. constant, constant

6210. Which of the following is the definition of proportional band of a controller ?
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A. The range of measured variables through which the air output changes from maximum to minimum

B. The range of measured variables from set value

C. None of the above

D. Any of the above

E. The range of air output as measured variable varies from maximum to minimum

6211. Which of the following can be measured by the use of a tachogenerator ?
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A. Speed and acceleration

B. Speed

C. None of the above

D. Displacement

E. Acceleration

6212. In closed loop control system, with positive value of feedback gain the overall gain of the system will______________?
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A. be unaffected

B. decrease

C. increase

D. any of the above

6213. A control system in which the control action is somehow dependent on the output is known as____________?
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A. None of the above

B. Semiclosed loop system

C. Open system

D. Closed loop system
6214. For open control system which of the following statements is incorrect ?
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A. Errors are caused by disturbances

B. Recalibration is not required for maintaining the required quality of the output

C. Construction is simple and maintenance easy

D. Less expensive

6215. In a control system the output of the controller is given to_____________?
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A. none of the above

B. amplifier

C. final control element

D. sensor

E. comparator

6216. The frequency and time domain are related through which of the following ?
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A. Either B. or C.

B. Laplace Transform and Fourier Integral

C. Fourier Integral

D. Laplace Transform

6217. A phase lag lead network introduces in the output_______________?
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A. none of the above

B. lag at all frequencies

C. lag at low frequencies and lead at high frequencies

D. lag at high frequencies and lead at low frequencies

6218. In electrical-pneumatic system analogy the current is considered analogous to_____________?
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A. velocity

B. pressure

C. air flow rate

D. air flow

6219. _______________is an open loop control system?
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A. Field controlled D.C. motor

B. Ward Leonard control

C. Stroboscope

D. Metadyne

6220. A differentiator is usually not a part of a control system because it______________?
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A. reduces damping

B. increases input noise

C. reduces the gain margin

D. increases error

6221. technique gives quick transient and stability response______________?
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A. Bode

B. Nichols

C. Root locus

D. Nyquist

6222. The band width, in a feedback amplifier_______________?
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A. decreases by the same amount as the gain decrease

B. decreases by the same amount as the gain increase

C. remains unaffected

D. increases by the sane saaaajajt as the gain decrease
6223. The diameter of the rotor shaft for an electric motor depends on which of the following ?
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A. Horse power only

B. Horse power and r.p.m.

C. Horse power, r.p.m. and power factor

D. r.p.m. only

6224. While selecting motor for an air conditioner which of the following characteristics is of great importance ?
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A. None of the above

B. Type of bearings

C. Type of enclosure

D. Arrangement for power transmission

E. Noise
6225. The starting torque of a D.C. motor is independent of which of the following?
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A. Flux

B. Armature current

C. Speed

D. Flux and armature current

6226. A reluctance motor_________________?
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A. requires starting gear

B. is provided with slip rings

C. is compact

D. has high cost

6227. ___________________has least range of speed control?
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A. D.C. shunt motor

B. Schrage motor

C. Slip ring induction motor

D. Synchronous motor
6228. Battery operated scooter for braking uses________________?
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A. plugging

B. mechanical braking

C. regenerative braking

D. rheostatic braking

6229. The cost of an induction motor will increase as________________?
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A. horsepower rating decreases but r.p.m. increases

B. horsepower rating and operating speed increases

C. horsepower rating increases but r.p.m. decreases

D. horsepower rating and operating speed decreases

6230. For a D.C. shunt motor which of the following is incorrect ?
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A. Torque varies as armature current

B. Unsuitable for heavy duty starting

C. Torque is zero for zero armature current

D. Torque-armature current is a straight line

6231. Belted slip ring induction motor is almost invariably used for_________________?
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A. jaw crushers

B. centrifugal blowers

C. water pumps

D. none of the above

6232. In case of _______________ speed control by injecting e.m.f. in the rotor circuit is possible?
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A. d.c. shunt motor

B. slip ring induction motor

C. schrage motor

D. synchronous motor

6233. The starting torque in case of centrifugal pumps is generally_________________?
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A. less than running torque

B. slightly more than running torque

C. same as running torque

D. double the running torque

6234. Which of the following motors has series characteristics ?
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A. Capacitor start motor

B. None of the above

C. Repulsion motor

D. Shaded pole motor

6235. Which of the following motors is used for elevators ?
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A. Synchronous motor

B. Any of the above

C. Induction motor

D. Capacitor start single phase motor

6236. The characteristics of drive for crane hoisting and lowering are which of the following ?
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A. Precise control

B. All of the above

C. Fast speed control

D. Smooth movement

6237. The capacity of a crane is expressed in terms of_______________?
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A. any of the above

B. type of drive

C. span

D. tonnes
6238. Heat control switches are used in__________________?
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A. three phase induction motors

B. cooling ranges

C. single phase

D. transformers

6239. ________________ motor is a constant speed motor?
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A. Schrage motor

B. Universal motor

C. Induction motor

D. Synchronous motor
6240. In squirrel cage induction motors which of the following methods of starting cannot be used ?
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A. Resistance in rotor circuit

B. Star-delta starting

C. Resistance in stator circuit

D. Auto-transformer starting

6241. In series motor which of the following methods can be used for changing the flux per pole ?
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A. Series-parallel control

B. Diverter field control

C. Tapped field control

D. Any of the above
6242. In ______________ the speed can be varied by changing the position of brushes?
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A. induction motor

B. slip ring motor

C. repulsion motor

D. schrage motor
6243. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
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A. low windage losses

B. slop speed operation

C. high starting torque

D. all of the above

6244. For crane travel which of the following motors is normally used ?
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A. D.C. differentially compound motor

B. Synchronous motor

C. AC. slip ring motor

D. Ward-Leonard controlled D.C. shunt motor

6245. For a motor-generator set which of the following motors will be preferred ?
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A. Slip ring induction motor

B. Synchronous motor

C. Squirrel cage induction motor

D. Pole changing induction motor

6246. For which of the following applications D.C. motors are still preferred ?
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A. Reversibility

B. Variable speed drive

C. High efficiency operation

D. High starting torque

6247. need frequent starting and stopping of electric motors ?
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A. Paper mills

B. Lifts and hoists

C. Air-conditioners

D. Grinding mills

6248. Which of the following motors are best for the rolling mills ?
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A. Squirrel cage induction motors

B. Single phase motors

C. Slip ring induction motors

D. D.C. motors
6249. _________________method of starting a three phase induction motor needs six terminals ?
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A. Star-delta

B. Resistance starting

C. Auto-transformer

D. None of the above

6250. Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
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A. Light duty

B. Heavy duty

C. All of the above

D. Medium duty