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
2651. If L/C ratio of a parallel LC circuit is increased, the Q of the circuit______________?
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A. None of the above

B. Is increased

C. Is decreased

D. Remains the same

2652. For frequencies above the resonant frequency , a series LC circuit behaves as a ____________load?
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A. Capacitive

B. None of the above

C. Resistive

D. Inductive
2653. In the normal operation of an SCR, anode is __________ w.r.t. cathode?
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A. Positive

B. Negative

C. At zero potential

D. None of the above

2654. At series resonance, the net reactive component of circuit current is _______________?
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A. Zero

B. Capacitive

C. None of the above

D. Inductive

2655. The superhetrodyne principle provides selectivity at ______________stage?
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A. IF

B. RF

C. Before RF

D. audio

2656. The number of atoms per unit cell in B.C.C. structure is_____________?
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A. 4

B. 8

C. 2

D. 1

2657. In amplitude modulation, bandwidth is ____________ the audio signal frequency?
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A. Four times

B. Thrice

C. Twice

D. None of the above

2658. The letters AVC stand for ________________?
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A. Abrupt voltage control

B. Automatic voltage control

C. Audio voltage control

D. Automatic volume control
2659. A tuned amplifier is generally operated in ____________operation?
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A. Class A

B. Class C

C. Class B

D. None of the above

2660. Superhertodyne principle refers to_________________?
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A. Using a large number of amplifier stages

B. Obtaining lower fixed intermediate frequency

C. None of the above

D. Using a push-pull circuit

2661. At series or parallel resonance, the circuit behaves as a ______________ load?
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A. Inductive

B. Capacitive

C. None of the above

D. Resistive
2662. Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1K? & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?
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A. 51dB

B. 102dB

C. 49dB

D. 98dB
2663. For frequencies below resonant frequency, a series LC circuit behaves as a _____________ load?
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A. None of the above

B. Resistive

C. Inductive

D. Capacitive
2664. A perfect conductor has_____________?
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A. none of the above

B. unity conductivity

C. zero conductivity

D. infinite conductivity
2665. An SCR has ___________semiconductor layers?
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A. Three

B. Two

C. Four

D. None of the above

2666. The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
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A. induction motor

B. synchronous motor

C. d.c. series motor .

D. d.c. shunt motor

2667. If the resistance of a tuned circuit is increased, the Q of the circuit _______________?
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A. Remains the same

B. Is increased

C. Is decreased

D. None of the above

2668. In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?
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A. all capacitors

B. all inductors

C. all transistors

D. all resistors

2669. An SCR behaves as a____________switch?
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A. Mechanical

B. Bidirectional

C. None of the above

D. Unidirectional
2670. If Q of an LC circuit increases, then bandwidth ______________?
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A. Insufficient data

B. Increases

C. Remains the same

D. Decreases
2671. For frequencies below the resonant frequency , a parallel LC circuit behaves as a ______________load?
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A. Inductive

B. None of the above

C. Capacitive

D. Resistive

2672. A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?
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A. Open-loop gain

B. Slew rate

C. Bandwidth

D. CMMR

2673. Which of the following material is not a semiconductor ?
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A. Gallium-arsenide

B. Selenium

C. Germanium

D. Silica
2674. In the above question, what is the power in sidebands?
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A. 8 kW

B. 06 kW

C. 6 kW

D. 9 kW

2675. Modulation refers to a low-frequency signal controlling the ________________?
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A. Phase of the carrier

B. May be any of the above

C. Amplitude of the carrier

D. Frequency of the carrier

2676. An SCR is a ____________ triggered device?
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A. Voltage as well as current

B. Voltage

C. Current

D. None of the above

2677. In series resonance, there is__________________?
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A. Voltage amplification

B. Current amplification

C. Both voltage and current amplification

D. None of the above

2678. Selenium is __________ semiconductor?
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A. P-type

B. extrnisic

C. intmisic

D. N-type

2679. Which of the following materials is preferred for transmitting electrical energy over long distance ?
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A. Aluminium

B. Steel reinforced copper

C. Steel reinforced aluminium

D. Copper

2680. In conductors conduction of electricity takes place due to movement of_______________?
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A. negative ions only

B. positive and negative ions

C. electrons only

D. positive ions only

E. none of the above

2681. If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?
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A. none of the above

B. drastically increased

C. unaffected

D. drastically reduced
2682. In an SCR circuit the supply voltage is generally ___________ that of breakover voltage?
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A. None of the above

B. Equal to

C. Greater than

D. Less than
2683. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
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A. Kanthal

B. Molybdenum

C. Constantan

D. Nichrome
2684. A high Q tuned circuit will permit an amplifier to have high __________________?
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A. Sensitivity

B. Fidelity

C. Selectivity

D. Frequency range

2685. Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?
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A. Skin effect

B. Internal Capacitance of the device

C. Coupling capacitor at the input

D. Coupling capacitor at the output

2686. Carbon resistors are used extensively because they are____________?
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A. all of the above reasons

B. inexpensive

C. compact

D. easy to make

2687. __________ is the main constituent of glass?
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A. Fe203

B. AI2O3

C. B2O3

D. Si02
2688. We can control a.c. power in a load by connecting ______________?
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A. Two SCRs in series

B. Two SCRs in parallel opposition

C. Two SCRs in parallel

D. None of the above

2689. Which of the following amplifier circuit using junction transistor has the best gain?
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A. Common emitter

B. All have the same gain

C. Common base

D. Common collector

2690. Constantan contains_______________?
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A. tungsten and silver

B. copper and tungsten

C. silver and tin

D. copper and nickel
2691. . If =0.98 ,Ico=6A and I?=100A for a transistor,then the value of Ic will be______?
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A. 3.2mA

B. 4.6 mA

C. 2.3mA

D. 5.2mA
2692. The Q of an LC circuit is given by _________________?
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A. R2/2pfrL

B. 2pfr x R

C. R / 2pfrL

D. 2pfrL / R
2693. In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?
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A. Vdc = Vm/?, PIV=2Vm

B. Vdc = Vm/?, PIV=Vm

C. Vdc = 2Vm/?, PIV=2vm

D. Vdc = 2Vm/?, PIV=Vm

2694. The action of electromagnetic machines can be related to which of the following basic principles __________?
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A. Interaction

B. Alignment

C. All of the above

D. Induction

2695. Frequencies above ______________ kHz are called radio frequencies?
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A. 10

B. 2

C. 50

D. 200
2696. In graphite, bonding is____________?
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A. covalent

B. Vander Waals

C. Vander Waals and covalent

D. metallic

2697. The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is _______________?
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A. 1310 kHz

B. 1520 kHz

C. 455 kHz

D. 1500 kHz

2698. In an unregulated power supply, if load current increases, the output voltage _____________?
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A. Increases

B. Remains the same

C. Decreases

D. None of the above

2699. A Zener diode is used as a _____________voltage regulating device?
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A. Shunt

B. None of the above

C. Series

D. Series-shunt

2700. In a Zener voltage regulator, the changes in load current produce changes in _________________?
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A. None of the above

B. Zener current

C. Zener voltage

D. Zener voltage as well as Zener current