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
5501. What is the octal equivalent of the binary number : 10111101 ?
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A. 572

B. 573

C. 675

D. 275
5502. 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. Bi-directional I/O pin access

B. Input operation

C. All of the above

D. Tristate output operation

5503. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is__________________?
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A. CMOS

B. ECL

C. TTLLS

D. TTLAS

5504. The inputs of a NAND gate are connected together. The resulting circuit is _______________?
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A. None of the above

B. OR gate

C. NOT gate

D. AND gate

5505. Positive logic in a logic circuit is one in which______________?
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A. logic 0 and 1 are represented by 0 and positive voltage respectively

B. logic 0 and, -1 are represented by negative and positive voltages respectively

C. logic 0 voltage level is higher than logic 1 voltage level

D. logic 0 voltage level is lower than logic 1 voltage level
5506. Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is__________________?
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A. 12CPS

B. 120 CPS

C. 10 CPS

D. None of the above

5507. Most of the digital computers do not have floating point hardware because_____________?
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A. of no specific reason.

B. floating point hardware is costly

C. it is slower than software

D. it is not possible to perform floating point addition by hardware

5508. An important limitation of a crystal oscillator is____________?
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A. Its high output

B. Less availability of quartz crystal

C. Its low output

D. Its high Q

5509. In an LC transistor oscillator, the active device is___________?
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A. None of the above

B. Transistor

C. LC tank circuit

D. Biasing circuit

5510. An oscillator differs from an amplifier because it_____________?
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A. Requires no d.c. supply

B. Has more gain

C. Requires no input signal

D. Always has the same input

5511. In a certain oscillator Av = 50. The attention of the feedback circuit must be___________?
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A. 1

B. 10

C. 1

D. 02
5512. A second condition for oscillations is____________?
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A. The attention of the feedback circuit must be one-third

B. A gain of 1 around the feedback loop

C. No gain around the feedback loop

D. The feedback circuit must be capacitive

5513. In Colpitts oscillator, feedback is obtained___________?
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A. By a tickler coil

B. A. By magnetic induction

C. From the centre of split capacitors

D. None of the above

5514. An oscillator produces___________oscillations?
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A. None of the above

B. Modulated

C. Damped

D. Undamped
5515. If the crystal frequency changes with temperature, we say that crystal has___________temperature coefficient?
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A. Zero

B. None of the above

C. Negative

D. Positive
5516. The application where one would most likely find a crystal oscillator is____________?
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A. Radio receiver

B. Radio transmitter

C. AF sweep generator

D. None of the above

5517. An LC oscillator cannot be used to produce ____________frequencies?
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A. Audio

B. Very high

C. Very low

D. High

5518. In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?
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A. Decreased 4 times

B. Increased 4 times

C. Decreased 2 times

D. Increased 2 times

5519. The Q of the crystal is of the order of____________?
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A. 1000

B. 100

C. More than 10,000

D. 50

5520. The signal generator generally used in the laboratories is___________oscillator?
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A. Hartely

B. Phase shift

C. Crystal

D. Wien-bridge
5521. An oscillator employs___________feedback?
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A. Neither positive nor negative

B. Data insufficient

C. Positive

D. Negative

5522. One condition for oscillation is_____________?
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A. A gain around the feedback loop of one-third

B. A gain around the feedback loop of less than 1

C. A phase shift around the feedback loop of 180o

D. A phase shift around the feedback loop of 0o
5523. The crystal oscillator frequency is very stable due to___________of the crystal?
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A. Low Q

B. Vibrations

C. High Q

D. Rigidity

5524. Hartley oscillator is commonly used in______________?
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A. Radio receivers

B. Radio transmitters

C. None of the above

D. TV receivers

5525. Quartz crystal is most commonly used in crystal oscillators because:____________?
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A. It has superior electrical properties

B. None of the above

C. It is easily available

D. It is quite inexpensive

5526. An oscillator converts __________?
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A. mechanical power into a.c. power

B. power into a.c. power

C. power into d.c. power

D. none of the above

5527. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency____________?
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A. Increases

B. Insufficient data

C. Decreases

D. Remains the same

5528. In an LC circuit, when the capacitor is maximum, the inductor energy is____________?
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A. Maximum

B. None of the above

C. Half-way between maximum and minimum

D. Minimum
5529. In a phase shift oscillator, the frequency determining elements are _______________?
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A. R and C

B. L and C

C. None of the above

D. R, L and C

5530. In an LC oscillator, the frequency of oscillator is____________L or C?
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A. Proportional to square of

B. Directly proportional to

C. Inversely proportional to square root of

D. Independent of the values of

5531. A Wien bridge oscillator uses___________feedback?
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A. Only positive

B. Only negative

C. Both positive and negative

D. None of the above

5532. In a phase shift oscillator, we use____________RC sections?
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A. Two

B. Four

C. None of the above

D. Three
5533. The piezoelectric effect in a crystal is___________?
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A. A change in resistance because of temperature

B. A change in frequency because of temperature

C. None of the above

D. A voltage developed because of mechanical stress
5534. ____________is a fixed frequency oscillator?
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A. Hartely-oscillator

B. Phase-shift oscillator

C. Colpitts oscillator

D. Crystal oscillator
5535. For an oscillator to properly start, the gain around the feedback loop must initially be_________?
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A. Greater than 1

B. 1

C. Less than 1

D. Equal to attenuation of feedback circuit

5536. Average resistance of human body is____________?
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A. 2000 ohms

B. 1000 ohms

C. 500 ohms

D. 1500 ohms

5537. When earth fault occurs______________?
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A. none of the above

B. voltage potential at the earth mat remains zero irrespective of fault

C. voltage potential at the earth mat increases due to grounding

D. voltage potential at the earth mat decreases due to grounding

5538. The size of the earth or ground wire is based on the______________?
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A. maximum fault current carrying through the ground wire

B. rated current carrying capacity of the service line

C. depends on the soil resistance

D. both (A) and (C)
5539. For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?
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A. to provide low impedance

B. to discharge the charging capacitance to ground

C. protection for operating personnel

D. both (B) and (C)
5540. When the 3-phase system is not grounded and if Single Line to Ground fault occurs, the voltage of the other two healthy phases will____________?
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A. Remains unaffected

B. Increases

C. Decreases

5541. Moisture content in the soil __________ the earth soil resistance?
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A. decrease

B. does not affect

C. none of the above

D. increase

5542. Ground resistance should be designed such that_____________?
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A. grounding resistance should be always zero

B. grounding resistance should be as high as possible

C. none of the above

D. grounding resistance should be as low as possible
5543. Factors on which soil resistance depends_______________?
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A. moisture

B. depth of the electrode

C. all the above

D. Nacl

5544. The objective of earthing or grounding is_______________?
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A. none of the above

B. to provide as low resistance possible to the ground

C. to provide as high resistance possible to the ground

D. to provide flow of positive, negative and zero sequence currents

5545. Generally grounding is provided for
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A. only for the safety of the equipment

B. only for the safety of the operating personnel

C. both (A) and (B)

D. none of the above

5546. The purpose of capacitors in a transistor amplifier is to___________________?
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A. Couple or bypass a.c. component

B. Provide biasing

C. Protect the transistor

D. Cool the transistor

5547. In the zero signal conditions, a transistor sees _____________ load?
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A. c.

B. c.

C. both d.c. and a.c.

D. none of the above

5548. The purpose of d.c. conditions in a transistor is to___________________?
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A. None of the above

B. Set up operating point

C. Reverse bias the emitter

D. Forward bias the collector

5549. The purpose of a coupling capacitor in a transistor amplifier is to ___________________?
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A. Protect the transistor

B. Increase the output impedance of transistor

C. Provide biasing

D. Pass a.c. and block d.c.
5550. In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________________?
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A. Open

B. Partially open

C. None of the above

D. Short