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
401. In a series circuit with unequal resistances______________?
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A. the lowest resistance has the highest voltage drop

B. the highest resistance has the highest voltage drop

C. the highest resistance has the most of the current through it

D. the lowest resistance has the highest current

402. The value of flux involved m the e.m.f. equation of a transformer is____________?
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A. instantaneous value

B. average value

C. r.m.s. value

D. maximum value
403. Sumpners test is conducted on transformers to determine_____________?
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A. stray losses

B. temperature

C. all-day efficiency

D. none of the above

404. Which of the following statement is true________________?
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A. A galvanometer with low resistance in series is an ammeter

B. A galvanometer with low resistance in parallel is a voltmeter

C. A galvanometer with high resistance in parallel is a voltmeter

D. A galvanometer with high resistance in series is an ammeter

405. When electric current passes through a metallic conductor, its temperature rises. This is due to__________?
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A. the release of conduction electrons from parent atoms

B. mutual collisions between metal atoms

C. mutual collisions between conducting electrons

D. collisions between conduction electrons and atoms
406. A common method of cooling a power transformer is_______________?
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A. air blast cooling

B. natural air cooling

C. any of the above

D. oil cooling
407. All of the following are equivalent to watt except_____________?
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A. amperes x volts

B. amperes/volt

C. (amperes) ohm

D. joules/seC.

408. Voltage dependent resistors are used_____________?
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A. as heating elements

B. for inductive circuits

C. as current stabilizers

D. to supress surges
409. In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?
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A. Positive

B. None of these

C. Negative

D. Zero

410. The chemical used in breather for transformer should have the quality of____________?
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A. cooling the transformer oil

B. absorbing moisture

C. cleansing the transformer oil

D. ionizing air

411. Ohms law is not applicable to____________?
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A. high voltage circuits

B. vacuum tubes

C. carbon resistors

D. circuits with low current densities

412. The purpose of providing an iron core in a transformer is to_____________?
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A. reduce eddy current losses

B. decrease the reluctance of the magnetic path

C. provide support to windings

D. reduce hysteresis loss

413. The advantage of using free wheeling diode in half controlled bridge converter is that
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A. There is always a path for the dc current dependent of the ac line

B. There is always a path for the dc current independent of the ac line

C. There is always a path for the ac current independent of the ac line

D. There is always a path for the ac current independent of the ac line

414. Which winding of the transformer has less cross-sectional area?
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A. Primary winding

B. High voltage winding

C. Low voltage winding

D. Secondary winding

415. An ideal transformer is one which has_____________?
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A. none of the above

B. core of stainless steel and winding of pure copper metal

C. no losses and magnetic leakage

D. a common core for its primary and secondary windings

E. interleaved primary and secondary windings

416. The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as____________?
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A. Electromagnetic compatibility

B. Emission

C. Interference

D. Susceptibility

417. Which method can be used for absolute measurement of resistances _______________?
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A. Releigh method

B. Lorentz method

C. Wheatstone bridge method

D. Ohms law method

418. Conductance is reciprocal of____________?
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A. capacitance

B. resistance

C. inductance

D. reluctance

419. The function of conservator in a transformer is___________________?
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A. to cool the transformer oil

B. to project againstinternal fault

C. to reduce copper as well as core losses

D. to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
420. Which of the following statement is true both for a series and a parallel D. C. circuit?
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A. Currents are additive

B. Elements have individual currents

C. Power are additive

D. Voltages are additive

421. Which of the following does not change in a transformer ?
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A. All of the above

B. Frequency

C. Voltage

D. Current

422. DIAC and TRIAC both are semiconductors devices and conduct in____________________?
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A. DIAC conducts in forward direction and TRIAC conducts in reverse direction

B. Both conducts in forward direction

C. Both conducts in reverse direction

D. Both conducts in either direction
423. An ideal transformer has infinite values of primary and secondary inductances. The statement is______________?
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A. TRUE

B. false
424. While conducting short-circuit test on a transformer the following side is short circuited?
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A. Secondary side

B. Low voltage side

C. Primary side

D. High voltage side

425. International ohm is defined in terms of the resistance of________________?
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A. the unit length of wire

B. a cube of copper

C. a column of mercury

D. a cube of carbon

426. The transformer laminations are insulated from each other by____________?
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A. any of the above

B. thin coat of varnish

C. paper

D. mica strip

427. Which of the following quantities remain the same in all parts of a series circuit ____________?
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A. Resistance

B. Current

C. Power

D. Voltage

428. TRIAC is a semiconductor power electronic device which contains____________?
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A. Two SCRs connected in reverse parallel

B. Two SCRs connected in parallel

C. Two SCRs connected in series

D. Two BJTs connected in series

429. Nichrome wire is an alloy of_____________?
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A. lead and zinc

B. chromium and vanadium

C. copper and silver

D. nickel and chromium
430. Temperature co-efficient of resistance is expressed in terms of___________?
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A. ohms/C

B. ohms/ohmC

C. mhos/C

D. mhos/ohmC

431. Distribution transformers are generally designed for maximum efficiency around________________?
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A. 90% load

B. 50% load

C. 25% load

D. zero load

432. For testing appliances, the wattage of test lamp should be_____________?
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A. high

B. low

C. any value

D. very low

433. Which one of the following does not have negative temperature co-efficient ____________?
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A. Aluminium

B. Rubber

C. Mica

D. Paper

434. The efficiency of a transformer will be maximum when_____________?
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A. eddy current losses = copper losses

B. copper losses = iron losses

C. hysteresis losses = eddy current losses

D. copper losses = hysteresis losses

435. Out of the following which is an insulating material____________?
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A. Copper

B. Paper

C. Silver

D. Gold

436. For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?
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A. Three capacitances

B. Three transistors

C. Three resistance

D. Three inductances
437. The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
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A. Buchholz relay

B. Bushings

C. Breather

D. Conservator
438. When current flows through heater coil it glows but supply wiring does not glow because______________?
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A. supply wiring is covered with insulation layer

B. supply wires are made of superior material

C. resistance of heater coil is more than the supply wires

D. current through supply line flows at slower speed

439. At low value of power factor, the cost of generation of a power station will be____________?
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A. none of the above

B. high

C. low

D. remain same

440. jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?
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A. 6.6 kV (r.m.s. value)/cm

B. 11 kV (r.m.s. value)/cm

C. 30 kV (maximum value)/cm

D. 22 kV (maximum value)/cm

441. Binaryvapour cycles are used to_____________?
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A. increase the efficiency of the plant

B. increase the performance of the condenser

C. increase efficiency of the turbine

442. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?
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A. 33.3 percent of copper

B. 66.7 percent of copper

C. 125 percent of copper

D. 31.25 percent of copper
443. The power transmitted will be maximum when____________?
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A. corona losses are minimum

B. reactance is high

C. sending end voltage is more

D. receiving end voltage is more

444. A steam power station requires space______________?
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A. more than diesel power station

B. less than diesel power station

C. equal to diesel power station

445. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?
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A. same as long as initial pressure and temperature is unchanged

B. higher

C. lower

D. none of the above

446. Primary air is that air which is used to_____________?
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A. reduce the flame length

B. increase the flame length

C. transport and dry the coal

D. provide air around burners for getting optimum combustion

447. In transmission lines the cross-arms are made of________________?
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A. R.C.C.

B. copper

C. steel

D. wood

448. Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?
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A. Synchronous condenser

B. Booster transformer

C. Static condenser

D. Tap changing transformer

449. The effect of considering friction in steam nozzles for the same pressure ratio leads to_________?
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A. decrease or increase of dryness fraction of exit steam depending upon inlet quality

B. decrease in dryness fraction of exit steam

C. no change in the quality of exit steam

D. increase in dryness fraction of exit steam
450. Losses which occur in rotating electric machines and do not occur in transformers are___________?
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A. friction and windage losses

B. copper losses

C. magnetic losses

D. hysteresis and eddy current losses