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
1401. Synchronous motors are_____________?
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A. not-self starting

B. none of the above

C. self-starting

D. essentially self-starting

1402. A synchronous motor can operate at____________?
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A. lagging, leading and unity power factors

B. leading power factor only

C. lagging power factor only

D. unity power factor only

1403. Depreciation charges are high in case of__________?
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A. none of these

B. thermal plant

C. diesel plant

D. hydroelectric plant

1404. The phase difference between voltage and current wave through a circuit element is given as 30. The essential condition is that
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A. both waves must have same frequency

B. both waves must have identical peak values

C. both waves must have zero value at the same time

D. none of the above

1405. The back e.m.f. in the stator of a synchronous motor depends on____________?
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A. none of the above

B. flux density

C. rotor speed

D. rotor excitation

E. number of poles

1406. With reference to a power station which of the following is not a fixed cost?
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A. Insurance charges

B. Interest on capital

C. Fuel cost

D. Depreciation

1407. Approximate estimation of power demand can be made by_____________?
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A. load survey method

B. economic parameters

C. all of the above

D. mathematical method

E. statistical methods

1408. By the use of which of the following power factor can be improved?
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A. Static capacitors

B. Phase advancers

C. Any of the above

D. Synchronous compensators

1409. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?
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A. a sinusoid of double the frequency

B. a sinusoid of half the original frequency

C. a sinusoid of the same frequency

D. not a sinusoid

1410. A synchronous motor can be started by________?
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A. providing damper winding

B. any of the above

C. D.C. compound motor

D. pony motor

1411. The working of a synchronous motor is similar to_____________?
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A. gear train arrangement

B. none of the above

C. transmission of mechanical power by shaft

D. turbine

E. distribution transformer

1412. Generators for peak load plants are usually designed for maximum efficiency at____________?
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A. 25 percent overload

B. full load

C. 25 to 50 percent full load

D. 50 to 75 percent full load
1413. In case of _________ fuel transportation is the major problem.
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A. thermal power plants

B. diesel power plants

C. nuclear power plants

D. hydro-electric power plants

1414. A terminal where three on more branches meet is known as______________?
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A. anode

B. combination

C. node

D. terminus

1415. A rotory converter can also be run as a___________?
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A. d.c. shunt motor

B. induction motor

C. d.c. series motor

D. synchronous motor

E. d.c. compound motor

1416. The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as___________?
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A. bilateral circuit

B. non-linear circuit

C. linear circuit

D. none of the above

1417. Kirchhoff s current law states that
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A. net current flow at the junction is positive

B. total sum of currents meeting at the junction is zero

C. no current can leave the junction without some current entering it.

D. Hebraic sum of the currents meeting at the junction is zero
1418. A consumer has to pay lesser fixed charges in____________?
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A. any of the above

B. two part tariff

C. maximum demand tariff

D. flat rate tariff

1419. A synchronous motor can be made self starting by providing?
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A. damper winding on stator as well as rotor poles

B. none of the above

C. damper winding on stator

D. damper winding on rotor poles

1420. Power factor of an electrical circuit is equal to____________?
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A. kW/kVA

B. R/Z

C. cosine of phase angle difference be-tween current and voltage

D. all of these

E. ratio of useful current to total current Iw/I

1421. Power plant having maximum demand more than the installed rated capacity will have utilization factor?
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A. none of the above

B. more than unity

C. less than unity

D. equal to unity

1422. Between the branch voltages of a loop the Kirchhoff s voltage law imposes_____________?
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A. non-linear constraints

B. no constraints

C. linear constraints

D. none of the above

1423. The peak value of a sine wave is 200 V. Its average value is___________?
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A. 282.8 V

B. 200V

C. 127.4 V

D. 141.4 V
1424. The area under a load curve gives__________?
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A. none of the above

B. maximum demand

C. energy consumed

D. average demand

1425. In a series parallel circuit, any two resistances in the same current path must be in___________?
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A. series with each other

B. series with the voltage source

C. parallel with each other

D. parallel with the voltage source

1426. Which of the following devices may be used to provide protection against lightening over voltages?
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A. Surge absorbers

B. All of the above

C. Horn gaps

D. Rod gaps

1427. The coupling angle or load angle of synchronous motor is defined as the angle between the__________?
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A. rotor and stator teeth

B. rotor and the stator poles of the same polarity

C. rotor and the stator poles of opposite polarity

D. none of the above

1428. According to Kirchhoffs voltage law, the algebraic sum of all IR drops and e.m.fs. in any closed loop of a network is always____________?
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A. positive

B. zero

C. negative

D. determined by battery e.m.fs.

1429. The circuit whose properties are same in either direction is known as__________?
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A. irreversible circuit

B. bilateral circuit

C. unilateral circuit

D. reversible circuit

1430. Low power factor is usually not due to___________?
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A. incandescent lamp

B. fluorescent tubes

C. induction motors

D. arc lamps

1431. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be___________?
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A. a voltage source

B. a current source

C. both of above

D. none of the above

1432. In a synchronous motor, V-curves represent relation between____________?
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A. field current and speed

B. field current and power factor

C. armature current and field current

D. power factor and speed

1433. In a synchronous motor, damper windings are provided on____________?
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A. pole faces

B. rotor shaft

C. none of the above

D. stator frame

1434. Choose the incorrect statement: A branch formed by the parallel connection
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A. A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

B. A branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

C. A branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.

D. A branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.

1435. A 3-phase synchronous motor is running clockwise. If the direction of its field current is reversed
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A. the motor will stop

B. none of the above

C. the motor will run in the reverse direction

D. the motor continue to run in the same direction

E. the winding of the motor will burn

1436. Load curve helps in deciding___________?
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A. sizes of the generating units

B. total installed capacity of the plant

C. operating schedule of generating units

D. all of the above
1437. In a synchronous motor, the damping winding is generally used to______________?
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A. reduce the eddy currents

B. reduce noise level

C. none of the above

D. prevent hunting and provide the starting torque

E. provide starting torque only

1438. Which of the following is an advantage of static capacitor for power factor improvement?
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A. Ease in installation

B. Low losses

C. Little maintenance cost

D. All of the above
1439. The minimum armature current of the synchronous motor corresponds to operation at______________?
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A. 0.707 power factor lagging

B. unity power factor

C. zero power factor leading

D. 0.707 power factor leading

1440. Annual instalment towards depreciation reduces as rate of interest increases with______________?
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A. sinking fund depreciation

B. none of the above

C. reducing balances depreciation

D. straight line depreciation

1441. Which plant can never have 100 percent load factor?
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A. Nuclear power plant

B. Hydro electric plant

C. Peak load plant

D. Base load plant

1442. Power factor of a synchronous motor is unity when_____________?
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A. the armature current is minimum

B. the armature current is maximum

C. the armature current is zero

D. none of the above

1443. Inductance of a coil Varies__________?
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A. directly as the cross-sectional area of magnetic core

B. directly as square of number of turns

C. inversely as the length of the iron path

D. directly as the permeability of the core

E. as A. to (d)
1444. Underground cables are laid at sufficient depth___________?
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A. for all of the above reasons

B. to minimize the effect of shocks and vibrations due to gassing vehicles, etc

C. to avoid being unearthed easily due to removal of soil

D. to minimise temperature stresses

1445. During the charging of a lead-acid cell__________?
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A. it gives out energy

B. its voltage increases

C. its cathode becomes dark chocolate brown in colour

D. specific gravity of H2SO4 decreases

1446. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
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A. one half

B. double

C. four times

D. none of the above

1447. In a cable immediately above metallic sheath ______ is provided
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A. earthing connection

B. none of the above

C. armouring

D. bedding
1448. In constant-current charging method, the supply voltage from discharged to fully charged condition____________?
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A. increases

B. remains constant

C. decreases

D. none of the above

1449. All definitions of power factor of a series R-L-C circuit are correct except__________?
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A. ratio of W and VA

B. ratio of kW and kVA

C. ratio of J and Z

D. ratio of net reactance and impedance
1450. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?
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A. none of the above

B. the less heat than produced by A.C. flowing through the same circuit

C. the same heat as produced by A.C. when flowing through the same circuit

D. the more heat than produced by A.C. when flowing through the same circuit