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
451. The operating voltage of supertension cables is up to_________________?
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A. 3.3 kV

B. 11 kV

C. 33 kV

D. 6.6 kV

452. Economisers improve boiler efficiency by__________?
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A. 4 to 10%

B. 10 to 12%

C. 1 to 5%

453. The value of the reheat factor is of the order of_____________?
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A. above 1.5

B. 1.1 to 1.5

C. 1.0 to 1.05

D. 0.8 to 1.0

454. The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
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A. protects the primary circuit

B. avoids core saturation and high voltage induction

C. is safe to human beings

D. none of the above

455. Mercury is a choice with steam in binary vapour cycle because it has____________?
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A. higher saturation temperature than other fluids

B. all above

C. higher critical temperature and pressure

D. relatively low vapourisation pressure

456. The maximum length of a screw conveyer is about___________?
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A. 100 metres

B. 60 metres

C. 30 metres

D. 40 metres

457. Pin type insulators are generally not used for voltages beyond_________?
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A. 1 kV

B. 33 kV

C. 22 kV

D. 11 kV

458. In _________ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners?
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A. central

B. none of the above

C. unit

459. Minimum voltage regulation occurs when the power factor of the load is_____________?
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A. leading

B. unity

C. lagging

D. zero

460. A booster is a_________________?
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A. none of the above

B. series wound generator

C. shunt wound generator

D. synchronous generator

461. Bucket elevators are used for___________?
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A. carrying coal in horizontal direction

B. carrying coal in vertical direction

C. carrying coal in any direction

462. For a transformer, operating at constant load current, maximum efficiency will occur at______________?
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A. unity power factor

B. 0.8 lagging power factor

C. 0.8 leading power factor

D. zero power factor

463. In a regenerative surface condenser_____________?
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A. there are three pumps to remove air, vapour and condensate

B. there is no pump, the condensate gets removed by gravity

C. there are two pumps to remove air and condensate

D. there is one pump to remove air and condensate

464. For the parallel operation of single phase transformers it is necessary that they should have___________?
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A. same efficiency

B. same number of turns on the secondary side.

C. same polarity

D. same kVA rating

465. By which of the following a bus-bar is rated?
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A. Current, voltage and frequency

B. Current only

C. Current and voltage

D. Current, voltage, frequency and short time current
466. The steel used in steel cored conductors is usually__________?
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A. all of the above

B. mild steel

C. alloy steel

D. stainless steel

E. high speed steel

467. Which of the following generating station has minimum running cost?
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A. Thermal

B. Diesel

C. Hydro

D. Nuclear

468. Which of the following load is responsible for lower power factor of supply system__________?
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A. induction motors

B. synchronous Motors

C. all of the above

D. resistive loads

469. The underground system cannot be operated above_________________?
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A. 33 kV

B. 440 V

C. 66 kV

D. 11 kV

470. Which of the following Power Plant causes least environmental pollution____________?
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A. Thermal Power Plant

B. Nuclear Power Plant

C. Diesel Power Plant

D. Hydro Power Plant
471. In the analysis of which of the following lines shunt capacitance is neglected?
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A. Long transmission lines

B. Short transmission lines

C. Medium as well as long transmission lines

D. Medium transmission lines

472. Owing to skin effect:
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A. portion of the conductor near the surface carries more current and core of the conductor carries less current

B. portion of the conductor near the surface carries less current and core of the conductor carries more current

C. none of the above

D. current flows through the half cross-section of the conductor

E. any of the above

473. Load carrying capacity of belt conveyor is about___________?
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A. 50 to 100 tonnes/hr

B. 150 to 200 tonnes/hr

C. 100 to 150 tonnes/hr

D. 20 to 40 tonnes/hr

474. For transmission of power over a distance of 500 km, the transmission voltage should be in the range?
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A. 150 to 220 kV

B. 20 to 50 kV

C. 60 to 100 kV

D. 100 to 120 kV

475. Rankine cycle operating on low pressure limit of p1 an 1 high pressure limit of p2__________?
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A. has same thermal efficiency as carnot cycle operating between same pressure limits

B. has lower thenal efficiency than carnot cycle operating between same pressure limit?

C. has higher the renal efficiency than the carnot cycle operating between same pressure limits

D. may be more or less depending upon the magnitude of p1 and p2

476. The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?
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A. decrease in exit velocity from the nozzle

B. no change in exit velocity from the nozzle

C. increase in exit velocity from the nozzle

D. increase or decrease depending upon the exit quality of steam

477. The draught produced by steel chimney as compared to that produced by brick chimney for the same height is_____________?
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A. may be more or less

B. more

C. same

D. less

478. Example of overfeed type stoker is___________?
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A. chain grate

B. travelling grate

C. all of the above

D. spreader

479. The main source of production of biogas is__________________?
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A. wet livestock waste

B. human waste

C. wet cow dung

D. all above
480. The voltage transformation ratio of a transformer is equal to the ratio of_______________?
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A. secondary current to primary current

B. secondary terminal voltage to primary applied voltage

C. secondary induced e.m.f. to primary induced e.m.f

D. primary turns to secondary turns

481. Deaerative heating is done to_____________?
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A. heat the water

B. remove dissolved gases in the water

C. heat the air in the water

D. erative heating is done to

482. For aluminium, as compared to copper, all the following factors have higher values except:
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A. co-efficient of linear expansion

B. specific volume

C. resistance per unit length for same cross-section

D. electrical conductivity
483. Which of the following relays is used on long transmission lines?
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A. None of the above

B. Mhos relay

C. Impedance relay

D. Reactance relay

484. The effect of corona can be detected by___________?
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A. faint luminous glow of bluish colour

B. all of the above

C. presence of ozone detected by odour

D. hissing sound

485. When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?
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A. remain unchanged

B. fall

C. none of the above

D. rise

486. Belt conveyer can be used to transport coal at inclinations upto____________?
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A. 90

B. 30

C. 80

D. 60

487. Which of the following are the constants of the transmission lines ?
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A. Resistance

B. Capacitance

C. Inductance

D. All of the above
488. The material commonly used for sheaths of underground cables is______________?
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A. copper

B. iron

C. lead

D. rubber

489. The minimum clearance between the ground and a 220 kV line is about_________________?
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A. 10.5 m

B. 5.5 m

C. 4.3 m

D. 7.0 m
490. Which of the following is not a constituent for making porcelain insulators ?
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A. Quartz

B. Kaolin

C. Felspar

D. Silica
491. Curtis turbine is_____________?
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A. pressure velocity compounded steam turbine

B. velocity compounded impulse steam turbine

C. pressure compounded impulse steam turbine

D. reaction steam turbine

492. The draught which a chimney produces is called_____________?
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A. forced draught

B. balanced draught

C. induced draught

D. natural draught
493. 310 km line is considered as_______________?
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A. a medium line

B. any of the above

C. a long line

D. a short line

494. The pressure on the two sides of the impulse wheel of a steam turbine_____?
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A. is same

B. increases from one side to the other side

C. decreases from one side to the other side

D. is different

495. In case of impulse steam turbine_____________?
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A. there is enthalpy drop in nozzles

B. none of the above

C. there is enthalpy drop only in moving blades

D. there is enthalpy drop in fixed and moving blades

496. In coal preparation plant, magnetic separators are used to remove___________?
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A. iron particles

B. sand

C. clinkers

D. dust

497. The fuel used in nuclear reactor is_____________?
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A. uranium

B. all of the above

C. radium

D. cadmium

498. Diesel power plant are generally used as___________?
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A. base load plant

B. peak load plant

C. none of the above

D. standby plant

499. In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?
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A. no insulation is required

B. varnish

C. bitumen

D. insulin

500. The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the________________?
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A. Raman effect

B. Ferranti effect

C. none of the above

D. Seeback effect