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
6401. Rankine efficiency of a steam power plant____________?
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A. improves in summer as compared to that in winter

B. none of the above

C. is unaffected by climatic conditions

D. improves in winter as compared to that in summer
6402. Mercury is a choice with steam in binary vapour cycle because it has____________?
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A. all above

B. higher saturation temperature than other fluids

C. higher critical temperature and pressure

D. relatively low vapourisation pressure

6403. Primary air is that air which is used to_____________?
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A. increase the flame length

B. transport and dry the coal

C. provide air around burners for getting optimum combustion

D. reduce the flame length

6404. In coal preparation plant, magnetic separators are used to remove___________?
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A. sand

B. iron particles

C. dust

D. clinkers

6405. Parsons turbine is___________?
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A. simple single wheel, impulse steam turbine

B. simple single wheel reaction steam turbine

C. multi wheel reaction steam turbine

D. pressure compounded steam turbine

6406. In steam turbines the reheat factor_____________?
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A. increases with the increase in number of stages

B. remains same irrespective of number of stages

C. decreases with the increase in number of stages

D. none of the above

6407. Due to which of the following reasons the cables should not be operated too hot ?
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A. Unequal expansion may create voids in the insulation which will lead to ionization

B. The oil may loose its viscosity and it may start drawing off from higher levels

C. Expansion of the oil may cause the sheath to burst

D. The thermal instability may rise due to the rapid increase of dielectric losses with temperature

E. All of the above
6408. The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?
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A. increase in exit velocity from the nozzle

B. decrease in exit velocity from the nozzle

C. no change in exit velocity from the nozzle

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

6409. The effect of considering friction in steam nozzles for the same pressure ratio leads to_________?
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A. no change in the quality of exit steam

B. increase in dryness fraction of exit steam

C. decrease or increase of dryness fraction of exit steam depending upon inlet quality

D. decrease in dryness fraction of exit steam

6410. The draught which a chimney produces is called_____________?
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A. forced draught

B. induced draught

C. balanced draught

D. natural draught
6411. The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________?
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A. 0.578

B. 0.6

C. 0.555

D. 0.5457
6412. The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation?
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A. pv

B. pv1i = C

C. pv = C

D. pv1A = C

6413. Evaporative type of condenser has___________?
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A. either A. or (b)

B. none of the above

C. water in pipes surrounded by steam

D. steam in pipes surrounded by water
6414. Solar thermal power generation can be achieved by_______________?
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A. using a solar pond

B. any of the above system

C. using flat plate collectors

D. using focusing collector or heliostates

6415. Edwards air pump____________?
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A. removes only un-condensed vapour from condenser

B. removes air alongwith vapour and also the condensed water from condenser

C. removes air and also vapour from condenser

D. removes only air from condenser

6416. Regenerative cycle thermal efficiency_______________?
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A. is same as simple Rankine cycle thermal efficiency

B. is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure

C. is always less than simple Rankine cycle thermal efficiency

D. is always greater than simple Rankine thermal efficiency
6417. The parallel combination of a 6.8 k? resistor and a 10 k? resistor is in series with the parallel combination of a 2.2 k? resistor and a 1 k? resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)___________?
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A. 6.8 k?

B. 2.2 k?

C. 2.2 k? and 1 k?

D. 6.8 k? and 10 k?
6418. The parallel combination of a 470 ? resistor and a 1.2 k? resistor is in series with the parallel combination of three 3 k? resistors. A 200 V source is connected across the circuit. The resistor with the most current has a value of____________?
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A. 470 ?

B. 3 k?

C. 1.2 k?

D. 470 ? or 1.2 k?

6419. Three 10 k? resistors are connected in series. A 20 k? resistor is connected in parallel across one of the 10 k? resistors. The voltage source is 24 V. The total current in the circuit is___________?
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A. 900 ?A

B. 800 ?A

C. 90 mA

D. 9 mA

6420. In a certain five-step R/2R ladder network, the smallest resistor value is 1 k?. The largest value is___________?
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A. Indeterminable

B. 10 k?

C. 20 k?

D. 2 k?
6421. A voltage divider consists of two 100 k? resistors and a 12 V source. What will the output voltage be if a load resistor of 1 M? is connected to the output?
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A. 0.57 V

B. 5.7 V

C. 12 V

D. 6 V

6422. A voltage divider consists of two 68 k? resistors and a 24 V source. The unknown output voltage is______________?
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A. 6 V

B. 0 V

C. 24 V

D. 12 V
6423. A certain voltage divider consists of three 1 k? resistors in series. Which of the following load resistors will have the least effect on the output voltage?
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A. 100 k?

B. 330 ?

C. 1 M?

D. 1 k?

6424. Two 3.3 k? resistors are in series and this series combination is in parallel with a 4.7 k? resistor. The voltage across one of the 3.3 k? resistors is 12 V. The voltage across the 4.7 k? resistor is_________?
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A. 12 V

B. 0 V

C. 6 V

D. 24 V
6425. If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?
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A. increases

B. remains the same

C. cannot tell

D. decreases
6426. The parallel combination of a 470 ? resistor and a 1.5 k? resistor is in series with the parallel combination of five 1 k? resistors. The source voltage is 50 V. The percentage of the load current through any single 1 K? resistor is__________?
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A. 50%

B. 100%

C. 20 %

D. 25%

6427. A certain Wheatstone bridge has the following resistor values: R1 = 10 k?, R2 = 720 ?, and R4 = 2.4 k?. The unknown resistance is_____________?
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A. 2.4 ?

B. 300 ?

C. 3,000 ?

D. 24 ?

6428. The current flowing through an unloaded voltage divider is called the____________?
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A. resistor current

B. bleeder current

C. load current

D. voltage current

6429. A Wheatstone bridge can be used to determine an unknown_____________?
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A. current

B. resistance

C. voltage

D. power

6430. With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?
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A. 200 mA

B. 600 mA

C. 800 mA

D. 400 mA
6431. A device able to supply electrical energy is a __________?
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A. battery

B. conductor

C. nonconductor

D. microwave

6432. The positive (+) and negative (-) ends of the battery are called ___________?
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A. battery knobs

B. circuit diagram

C. battery sides

D. battery terminals
6433. In a seriesparallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2s voltage will:___________?
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A. increase

B. cannot tell

C. remain the same

D. decrease
6434. In a seriesparallel circuit, individual component power dissipation are calculated using_____________?
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A. a percent of the voltage division ratio squared

B. a percent of the total power depending on resistor ratios

C. individual component parameters

D. total current squared multiplied by the resistor values

6435. A certain voltage divider consists of two 12 k? resistors in series. Which of the following load resistors will have the most effect on the output voltage?
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A. 24 k?

B. 18 k?

C. 12 k?

D. 1 M?

6436. The parallel combination of a 470 ? resistor and a 680 ? resistor is in series with the parallel combination of four 2 k? resistors. The total resistance is___________?
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A. 1,650 ?

B. 77.8 ?

C. 1,078 ?

D. 778 ?
6437. A 6 V battery output is divided down to obtain two output voltages. Three 2.2 k? resistors are used to provide the two taps. The two output voltages are___________?
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A. 2 V, 4 V

B. 2 V, 6 V

C. 4 V, 6 V

D. 2 V, 2 V

6438. The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is_____________?
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A. 20,000 ?

B. 200,000 ?

C. 1,000,000 ?

D. 100,000 ?
6439. When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read_____________?
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A. the same as the source voltage

B. twice the source voltage

C. zero volts

D. half the source voltage

6440. The first goal to accomplish in analyzing a complex series-parallel circuit is to____________?
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A. equate all series components

B. equate all parallel components

C. solve for the total current and resistance

D. solve for all the voltage drops

6441. Two 1.2 k? resistors are in series and this series combination is in parallel with a 3.3 k? resistor. The total resistance is____________?
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A. 5,700 ?

B. 138 ?

C. 880 ?

D. 1,389 ?
6442. A balanced Wheatstone bridge consists of an RV of 3,500 ?, an R2 of 200 ?, and an R3 of 680 ?. The value of RUNK is____________?
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A. 680 ?

B. 880 ?

C. 1,029 ?

D. 200 ?

6443. A 12 k? resistor, a 15 k? resistor, and a 22 k? resistor are in series with two 10 k? resistors that are in parallel. The source voltage is 75 V. Current through the 15 k? resistor is approximately___________?
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A. 5 mA

B. 1.4 mA

C. 14 mA

D. 50 mA

6444. On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
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A. 500 V

B. 1,000 V

C. 50 V

D. 1 V

6445. A certain circuit is composed of two parallel resistors. The total resistance is 1,403 ?. One of the resistors is 2 k?. The other resistor value is____________?
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A. 4.7 k?

B. 1,403 ?

C. 2 k?

D. 3,403 ?

6446. For frequencies above the resonant frequency, a parallel LC circuit behaves as a ____________ load?
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A. Capacitive

B. Inductive

C. None of the above

D. Resistive

6447. When either L or C is increased, the resonant frequency of LC circuit ____________?
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A. Insufficient data

B. Decreases

C. Increases

D. Remains the same

6448. The Q of a tuned circuit refers to the property of_______________?
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A. Selectivity

B. None of the above

C. Fidelity

D. Sensitivity

6449. At parallel resonance, the phase angle between the applied voltage and circuit current is _____________?
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A. None of the above

B. 180o

C. 0o

D. 90o

6450. Frequencies above ______________ kHz are called radio frequencies?
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A. 200

B. 10

C. 50

D. 2