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
3301. Automatic signalling is used for which of the following trains ?
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A. Suburban and Urban electric trains

B. Superfast trains

C. Mail and express trains

D. All trains

3302. Specific energy consumption is affected by which of the following factors ?
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A. Retardation and acceleration values

B. All of the above

C. Distance between stops

D. Gradient

3303. Which of the following braking systems on the locomotives is costly ?
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A. Vacuum braking on steam locomotives

B. Regenerative braking on electric locomotives

C. Vacuum braking on diesel locomotives

D. All braking systems are equally costly

3304. Which of the following motors is preferred when quick speed reversal is the main consideration ?
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A. D.C. motor

B. Wound rotor induction motor

C. Synchronous motor

D. Squirrel cage induction motor

3305. In tramways which of the following motors is used ?
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A. D.C. series motor

B. D.C. shunt motor

C. A.C. three phase motor

D. AC. single phase capacitor start motor

3306. Battery operated trucks are used in________________?
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A. steel mills

B. narrow gauge traction

C. factories for material transportation

D. power stations

3307. In which of the following base systems is 123 not a valid number ?
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A. Base 16

B. Base 3

C. Base8

D. Base 10

3308. If biasing is not done in an amplifier circuit, it results in________________?
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A. Unfaithful amplification

B. Excessive collector bias

C. Decrease in the base current

D. None of the above

3309. ___________________is preferred for synthetic fibre mills?
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A. Series motor

B. Shunt motor

C. Synchronous motor

D. Reluctance motor
3310. Battery operated scooter for braking uses__________________?
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A. plugging

B. rheostatic braking

C. mechanical braking

D. regenerative braking

3311. Co-efficient of adhesion reduces due to the presence of which of the following ?
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A. Sand on rails

B. Dew on rails

C. Oil on the rails

D. both B. and C.
3312. The point of intersection of d.c. and a.c. load lines represents __________________?
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A. None of the above

B. Voltage gain

C. Current gain

D. Operating point
3313. The leakage current across a pn junction is due to________________?
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A. Minority carriers

B. Junction capacitance

C. None of the above

D. Majority carriers

3314. For a particular application the type of electric-and control gear are determined by which of the following considerations ?
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A. Starting torque

B. Speed control range and its nature

C. Limitation on starting current

D. Conditions of environment

E. All of the above
3315. The most commonly used semiconductor is________________?
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A. Carbon

B. Sulphur

C. Germanium

D. Silicon
3316. The specific energy consumption of a train depends on which of the following ?
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A. e covered

B. All of the above

C. Acceleration and retardation

D. Gradient

3317. The circuit that provides the best stabilization of operating point is___________________?
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A. Collector feedback bias

B. None of the above

C. Potential divider bias

D. Base resistor bias

3318. Which is the correct order of sequence for representing the input values in K-map ?
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A. (00, 10, 01, 11)

B. (00, 10, 11, 01)

C. (00, 01, 10, 11)

D. (00, 01, 11, 10)

3319. Most of the digital computers do not have floating point hardware because_____________?
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A. of no specific reason.

B. it is not possible to perform floating point addition by hardware

C. floating point hardware is costly

D. it is slower than software

3320. The binary code of (21.125)10 is_______________?
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A. 10101.001

B. 10100.111

C. 10101.01

D. 10100.001

3321. In a particular biasing circuit, the value of RE is about _________________?
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A. 100 kO

B. 1 MO

C. 800 O

D. 10 kO

3322. The travelling speed of cranes varies from_________________?
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A. 5 to 10 m/s

B. 1 to 2.5 m/s

C. 20 to 30 m/s

D. 10 to 15 m/s

3323. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor_______________?
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A. Increases

B. Remains the same

C. Decreases

D. None of the above

3324. The barrier voltage at a pn junction for germanium is about________________?
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A. 0.3 V

B. Zero

C. 5 V

D. 3 V

3325. Overhead lines for power supply to tramcars are at a minimum height of______________?
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A. 3 m

B. 10 m

C. 15 m

D. 6 m

3326. An n-type semiconductor is______________?
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A. None of the above

B. Negatively charged

C. Positively charged

D. Electrically neutral
3327. In which of the following applications variable speed operation is preferred ?
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A. Ceiling fan

B. Water pump

C. Refrigerator

D. Exhaust fan

3328. The resistance encountered by a train in motion is on account of_________________?
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A. friction at various parts of the rolling stock

B. all of the above

C. resistance offered by air

D. friction at the track

3329. If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?
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A. 0.225

B. 0.26

C. 0.16

D. 0.3

3330. For a motor-generator set which of the following motors will be preferred ?
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A. Squirrel cage induction motor

B. Pole changing induction motor

C. Slip ring induction motor

D. Synchronous motor
3331. Co-efficient of adhesion is________________-?
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A. high in case of D.C. traction than in the case of AC. traction

B. low in case of D.C. traction than in the case of AC. traction

C. equal in both AC. and D.C. traction

D. any of the above

3332. Transistor biasing represents ______________ conditions?
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A. a.c

B. d.c

C. both a.c. and d.c

D. none of the above

3333. A reverse biased pn junction has resistance of the order of________________?
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A. kO

B. None of the above

C. O

D. MO
3334. Which of the following motors has series characteristics ?
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A. None of the above

B. Shaded pole motor

C. Repulsion motor

D. Capacitor start motor

3335. The stabilisation of operating point in potential divider method is provided by_______________?
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A. RC consideration

B. VCC consideration

C. None of the above

D. RE consideration
3336. Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
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A. All of the above

B. Light duty

C. Medium duty

D. Heavy duty
3337. A hole in a semiconductor is defined as_________________?
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A. A free electron

B. strong>. A free proton

C. A free neutron

D. The incomplete part of an electron pair bond
3338. Addition of pentavalent impurity to a semiconductor creates many________________?
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A. Bound electrons

B. Free electrons

C. Holes

D. Valence electrons

3339. In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 kO, what is the value of RE ?
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A. 2000 O

B. 800 O

C. 1400 O

D. 1600 O

3340. The binary number 10101 is equivalent to decimal number_________________?
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A. 19

B. 12

C. 21

D. 27

3341. For proper operation of the transistor, its collector should have___________________?
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A. None of the above

B. Very small size

C. Proper forward bias

D. Proper reverse bias
3342. Which of the following happens in Kando system ?
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A. Three phase A.C. is converted into D.C.

B. None of the above

C. Single phase A.C. is converted into D.C.

D. Single phase supply is converted into three phase system
3343. _______________has the least value of starting torque to full load torque ratio?
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A. D.C. shunt motor

B. Slip ring induction motor

C. Squirrel cage induction motor

D. D.C. series motor

3344. When a pentavalent impurity is added to a pure semiconductor, it becomes________________?
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A. An insulator

B. n-type semiconductor

C. p-type semiconductor

D. An intrinsic semiconductor

3345. The air resistance to the movement of the train is proportional to_____________?
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A. (speed)

B. speed

C. (speed)

D. 1/speed

3346. The value of stability factor for a base resistor bias is________________?
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A. 1-

B. (+1)RC

C. (+1)

D. RB (+1)

3347. In a semiconductor, current conduction is due to________________?
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A. Only free electrons

B. Holes and free electrons

C. None of the above

D. Only holes

3348. Which of the following drives is suitable for mines where explosive gas exists ?
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A. Diesel engine

B. Battery locomotive

C. Steam engine

D. Any of the above

3349. The disadvantage of base resistor method of transistor biasing is that it_________________?
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A. None of the above

B. Provides high stability

C. Is complicated

D. Is sensitive to changes in
3350. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
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A. all of the above

B. high starting torque

C. slop speed operation

D. low windage losses