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
3401. Specific energy consumption is least in ________________ service?
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A. urban

B. suburban

C. main line
3402. For 25 kV single phase system power supply frequency is_______________?
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A. 25 Hz

B. 16 Hz

C. 50 Hz

D. 60 Hz

3403. A silicon transistor is biased with base resistor method. If =100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB ?
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A. 105 kO

B. None of the above

C. 315 kO

D. 530 kO
3404. Which of the following state capitals is not on broad gauge track ?
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A. Jaipur

B. Bhopal

C. Lucknow

D. Chandigarh

3405. Which of the following happens when star-delta starter is used ?
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A. Starting voltage is reduced

B. Starting current is reduced

C. Both A. and B.

D. None of the above

3406. What is/are the configurable functions of each and every IOBs connected around the FPGA device from the operational point of view ?
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A. All of the above

B. Bi-directional I/O pin access

C. Tristate output operation

D. Input operation

3407. The wheels of a train, engine as well as bogies, are slightly tapered to_____________?
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A. facilitate in taking turns

B. facilitate braking

C. reduce friction

D. increase friction

3408. In ________________ method of staging three phase induction motors the starting voltage is not reduced?
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A. auto-transformer

B. any of the above

C. star-delta

D. slip ring
3409. 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

3410. _______________method can bring the locomotive to dead stop?
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A. Regenerative braking

B. None of the above

C. Plugging braking

D. Rheostatic braking

3411. The rate of acceleration on suburban orurban services is restricted by the consideration of______________?
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A. Track curves

B. Passenger Discomfort

C. Track size

D. Engine power

3412. For blowers which of the following motor is preferred ?
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A. D.C. series motor

B. Wound rotor induction motor

C. D.C. shunt motor

D. Squirrel cage induction motor

3413. Operating point represents__________________?
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A. Values of IC and VCE when signal is applied

B. None of the above

C. Zero signal values of IC and VCE

D. The magnitude of signal

3414. For a D.C. shunt motor which of the following is incorrect ?
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A. Torque-armature current is a straight line

B. Unsuitable for heavy duty starting

C. Torque is zero for zero armature current

D. Torque varies as armature current

3415. The efficiency of diesel locomotives is nearly_______________?
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A. 45 to 55 percent

B. 30 to 40 percent

C. 60 to 70 percent

D. 20 to 25 percent
3416. ________________is preferred for automatic drives?
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A. Squirrel cage induction motor

B. Synchronous motors

C. Any of the above

D. Ward-Leonard controlled D.C. motors
3417. The operating point is also called the _______________?
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A. Quiescent point

B. None of the above

C. Saturation point

D. Cut off point

3418. If the temperature increases, the value of VCE_________________?
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A. Remains the same

B. Is decreased

C. None of the above

D. Is increased

3419. Which of the following motors are best for the rolling mills ?
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A. D.C. motors

B. Squirrel cage induction motors

C. Slip ring induction motors

D. Single phase motors

3420. The coasting retardation is around_________________?
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A. 0.16 km phps

B. 1.6 km phps

C. 40 km phps

D. 16 km phps

3421. The purpose of resistance in the emitter circuit of a transistor amplifier is to _________________?
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A. None of the above

B. Limit the maximum emitter current

C. Limit the change in emitter current

D. Provide base-emitter bias

3422. Heat control switches are used in__________________?
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A. single phase

B. three phase induction motors

C. cooling ranges

D. transformers

3423. The pulsating torque exerted by steam locomotives causes which of the following ?
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A. Hammer blow

B. All of the above

C. Jolting and skidding

D. Pitching

3424. Which of the following is the advantage of electric braking ?
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A. More heat is generated during braking

B. It avoids wear of track

C. Motor continues to remain loaded during braking

D. It is instantaneous

3425. The voltage used for suburban trains in D.C. system is usually_______________?
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A. 12 V

B. 220 V

C. 24 V

D. 600 to 750 V
3426. ________________ frequency is not common in low frequency traction system?
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A. 25 Hz

B. non of these

C. 16 Hz

D. 40 Hz
3427. Addition of trivalent impurity to a semiconductor creates many_______________?
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A. Valence electrons

B. Bound electrons

C. Holes

D. Free electrons

3428. Which of the following braking systems is used on steam locomotives ?
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A. Vacuum system

B. Hydraulic system

C. None of the above

D. Pneumatic system

3429. In case of _________________ free running and coasting periods are generally long ?
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A. all of the above

B. main-line service

C. sub-urban service

D. urban service

3430. Transistor biasing is generally provided by a_______________?
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A. Bias battery

B. Diode

C. None of the above

D. Biasing circuit
3431. Heavy duty cranes are used in________________?
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A. heavy engineering workshops

B. all of the above

C. ore handling plants

D. steel plants

3432. Which of the following is the disadvantage of electric traction over other systems of traction ?
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A. Corrosion problems in the under-ground pipe work

B. All of the above

C. High capital outlay in fixed installations beside route limitation

D. Short time power failure interrupts traffic for hours

E. Interference with communication lines

3433. Excess-3 code is known as_________________?
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A. Algebraic code

B. Self-complementing code

C. Cyclic redundancy code

D. Weighted code

3434. Digital circuit can be made by the repeated use of________________?
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A. None of the above

B. NAND gates

C. OR gates

D. NOT gates

3435. For which of the following applications motor has to start with high acceleration ?
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A. Centrifugal pump

B. Oil expeller

C. Lifts and hoists

D. Floor mill

3436. By the use of which of the following m D.C. can be obtained from AC. ?
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A. Mercury arc rectifier

B. Motor generator set

C. Silicon diodes

D. Any of the above
3437. The normal value of adhesion friction is______________?
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A. 0.4

B. 0.12

C. 0.75

D. 0.25
3438. The battery connections required to forward bias a pn junction are_________________?
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A. +ve terminal to p and ve terminal to n

B. #NAME?

C. #NAME?

D. None of the above

3439. The zero signal IC is generally ______________ mA in the initial stages of a transistor amplifier?
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A. More than 10

B. 1

C. 4

D. 3

3440. The operating point ________________ on the a.c. load line?
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A. May or may not lie

B. Data insufficient

C. Also line

D. Does not lie

3441. Which of the following motors is preferred for traction work ?
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A. Universal motor

B. Three-phase induction motor

C. Synchronous motor

D. D.C. series motor

3442. ________________ motor is a constant speed motor?
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A. Synchronous motor

B. Induction motor

C. Schrage motor

D. Universal motor

3443. The return circuit for tramcars is through_______________?
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A. rails

B. cables

C. common earthing

D. neutral wire

3444. An ideal value of stability factor is________________?
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A. 200

B. More than 200

C. 100

D. 1

3445. Transistor biasing is done to keep _____________in the circuit?
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A. Proper alternating current

B. Proper direct current

C. The base current small

D. Collector current small

3446. Quadrilateral speed-time curve pertains to which of the following services ?
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A. Main line service

B. Sub-urban service

C. Urban and sub-urban service

D. Urban service

3447. The strength of a semiconductor crystal comes from______________?
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A. Forces between protons

B. Forces between nuclei

C. None of the above

D. Electron-pair bonds
3448. In main line service as compared to urban and suburban service______________?
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A. acceleration and retardation rates are low

B. distance between the stops is more

C. all of the above

D. maximum speed reached is high

3449. With forward bias to a pn junction , the width of depletion layer__________________?
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A. Remains the same

B. None of the above

C. Increases

D. Decreases
3450. Consider the representation of six-bit numbers by twos complement, ones complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000 ?
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A. Twos complement and ones complement only

B. Twos complement only

C. All three representations

D. Sign and magnitude and ones complement only