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
3351. The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 A, then IC will change by___________________?
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A. 20 A

B. 25 A

C. 100 A

D. 50 A
3352. When the load is above _______________ a synchronous motor is found to be more economical?
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A. 2 kW

B. 100 kW

C. 50 kW

D. 20 kW

3353. An AND gate will function as OR if________________?
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A. either of the inputs is 1

B. all the inputs are 0

C. all the inputs and outputs are complemented

D. all the inputs to the gates are 1

3354. A NAND gate is called a universal logic element because______________?
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A. it is used by everybody

B. all the minization techniques are applicable for optimum NAND gate realization

C. many digital computers use NAND gates

D. any logic function can be realized by NAND gates alone
3355. ___________________has least range of speed control?
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A. Slip ring induction motor

B. Synchronous motor

C. Schrage motor

D. D.C. shunt motor

3356. Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?
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A. Speed control

B. Starting characteristics

C. Horse power

D. Operating speed

3357. The braking retardation is usually in the range__________________?
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A. 0.30 to 0.6 km phps

B. 3 to 5 km phps

C. 0.6 to 2.4 km phps

D. 0.15 to 0.30 km phps

E. 10 to 15 km phps

3358. At room temperature, an intrinsic silicon crystal acts approximately as_______________?
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A. An insulator

B. A conductor

C. A battery

D. A piece of copper wire

3359. The load cycle for a motor driving a power press will be________________?
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A. continuous

B. continuous but periodical

C. intermittent and variable load

D. variable load

3360. The characteristics of drive for crane hoisting and lowering are which of the following ?
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A. Fast speed control

B. Smooth movement

C. All of the above

D. Precise control

3361. Which of the following types of motor enclosure is safest ?
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A. Totally enclosed

B. Open type

C. Totally enclosed fan cooled

D. Semi closed

3362. _______________watt-hours per tonne km is usually the specific energy consumption for suburban services?
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A. 160200

B. 120150

C. 5075

D. 1520

3363. Besides a constant speed a synchronous rotor possesses which of the following advantages ?
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A. Better efficiency

B. All of the above

C. High power factor

D. Lower cost

3364. Which of the following alternatives will be cheaper ?
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A. A 100 H.P. AC. three phase motor

B. Ten motors of 10 H.P. each

C. Five motors of 20 H.P. each

D. Four motors of 25 H.P. each

3365. The size of an excavator is usually expressed in terms of_________________?
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A. travel in metres

B. angle of swing

C. crowd motion

D. cubic metres
3366. When the temperature changes, the operating point is shifted due to _______________?
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A. Change in the values of circuit resistance

B. Change in ICBO

C. Change in VCC

D. None of the above

3367. When an input signal 1 is applied to a NOT gate, the output is ______________?
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A. 1

B. None of the above

C. 0

D. Either 0 & 1

3368. In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?
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A. 3 V

B. 8 V

C. V

D. 7 V

3369. In a transistor amplifier circuit VCE = VCB +________________?
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A. VBE

B. 2VBE

C. None of the above

D. 5 VBE

3370. A hole and electron in close proximity would tend to________________?
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A. None of the above

B. Repel each other

C. Attract each other

D. Have no effect on each other

3371. __________________ has relatively wider range of speed control?
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A. Squirrel cage induction motor

B. Ship ring induction motor

C. Synchronous motor

D. D.C. shunt motor
3372. At absolute temperature, an intrinsic semiconductor has________________?
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A. A few free electrons

B. Many holes

C. Many free electrons

D. No holes or free electrons
3373. Which of the following motors are pre-ferred for overhead travelling cranes ?
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A. Continuous duty motors

B. None of the above

C. Short time rated motors

D. Slow speed motors

3374. Which of the following is an advantage of electric traction over other methods of traction ?
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A. Faster acceleration

B. Better braking action

C. No pollution problems

D. All of the above

3375. The rate of acceleration on suburban orurban service is in the range_________________?
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A. 15 to 25 km phps

B. 0.2 to 0.5 km phps

C. 1.6 to 4.0 km phps

D. 5 to 10 km phps

3376. In Boolean algebra, the bar sign (-) indicates__________________?
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A. None of the above

B. AND operation

C. OR operation

D. NOT operation
3377. A semiconductor has ______________ temperature coefficient of resistance?
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A. Positive

B. Zero

C. Negative

D. None of the above

3378. The selection of an electric motor for any application depends on which of the following factors ?
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A. Cost

B. Mechanical characteristics

C. Size and rating of motors

D. All of the above

E. Electrical characteristics

3379. What is the octal equivalent of the binary number : 10111101 ?
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A. 573

B. 572

C. 675

D. 275
3380. An ideal traction system should have_______________?
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A. all of the above

B. equipment capable of with standing large temporary loads

C. easy speed control

D. high starting tractive effort

3381. The leakage current in a pn junction is of the order of________________?
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A. Aa

B. kA

C. mA

D. A
3382. _________________method of starting a three phase induction motor needs six terminals ?
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A. Auto-transformer

B. Resistance starting

C. None of the above

D. Star-delta
3383. Battery operated scooter for braking uses________________?
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A. mechanical braking

B. regenerative braking

C. rheostatic braking

D. plugging

3384. Flame proof motors are used in_________________?
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A. moist atmospheres

B. explosive atmospheres

C. steel mills

D. paper mills

3385. When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when_______________?
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A. wheel base of axles is more

B. degree of curvature is more

C. both A. and B.

D. none of the above

3386. 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
3387. In jaw crushers a motor has to often start against ____________________ load?
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A. normal

B. medium

C. heavy

D. low

3388. A semiconductor is formed by ______________bonds?
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A. Electrovalent

B. None of the above

C. Co-ordinate

D. Covalent
3389. The steam engine provided on steam locomotives is____________?
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A. double acting condensing type

B. single acting condensing type

C. single acting non-condensing type

D. double acting non-condensing type

3390. The starting torque in case of centrifugal pumps is generally_________________?
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A. less than running torque

B. double the running torque

C. slightly more than running torque

D. same as running torque

3391. For which of the following applications D.C. motors are still preferred ?
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A. Reversibility

B. High efficiency operation

C. High starting torque

D. Variable speed drive
3392. Locomotives with monometer bogies have_________________?
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A. low co-efficient of adhesion

B. suitability for passanger as well as freight service

C. lot of skidding

D. uneven distribution of tractive effect

3393. An OR gate has 6 inputs. The number of input words in its truth table are________________?
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A. 6

B. 128

C. 64

D. 32

3394. Which of the following motors always starts on load ?
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A. Fan motor

B. Conveyor motor

C. All of the above

D. Floor mill motor

3395. The number 1000 would appear just immediately after__________________?
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A. 7777 (octal)

B. FFFF (hex)

C. All of the above

D. 1111 (binary)

3396. The speed of a superfast train is______________?
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A. 60 kmph

B. more than 100 kmph

C. 100 kmph

D. 75 kmph

3397. In case of OR gate, no matter what the number of inputs, a____________________?
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A. 1 at any input causes the output to be at logic 1

B. 0 at any input causes the output to be at logic 1

C. 0 any input causes the output to be at logic 0

D. 1 at any input causes the output to be at logic 0

3398. The fan put of a 7400 NAND gate is_______________?
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A. 8TTL

B. 5TTL

C. 2TTL

D. 10TTL
3399. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is__________________?
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A. CMOS

B. TTLAS

C. ECL

D. TTLLS

3400. Due to which of the following co-efficient of adhesion improves ?
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A. All of the above

B. Dust on the rails

C. Rust on the rails

D. Sand on the rails