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
6451. At series or parallel resonance, the circuit behaves as a ______________ load?
comments icon0
A. Resistive

B. None of the above

C. Capacitive

D. Inductive

6452. For frequencies above the resonant frequency , a series LC circuit behaves as a ____________load?
comments icon0
A. Inductive

B. Resistive

C. Capacitive

D. None of the above

6453. In parallel resonance, there is _______________?
comments icon0

A. Both voltage and current amplification

B. Voltage amplifications

C. Current amplification

D. None of the above

6454. The Q of an LC circuit is given by _________________?
comments icon0

A. 2pfr x R

B. R2/2pfrL

C. R / 2pfrL

D. 2pfrL / R
6455. In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve ___________________?
comments icon0

A. Is lowered

B. Remains the same

C. None of the above

D. Is raised
6456. A tuned amplifier is generally operated in ____________operation?
comments icon0

A. Class A

B. Class B

C. Class C

D. None of the above

6457. If a high degree of selectivity is desired, then double-tuned circuit should have ___________ coupling?
comments icon0

A. None of the above

B. Loose

C. Critical

D. Tight

6458. In series resonance, there is__________________?
comments icon0
A. Voltage amplification

B. Current amplification

C. Both voltage and current amplification

D. None of the above

6459. At parallel resonance, the ratio L/C is ______________?
comments icon0

A. Zero

B. None of the above

C. Small

D. Very large
6460. If the resistance of a tuned circuit is increased, the Q of the circuit _______________?
comments icon0
A. Is decreased

B. Is increased

C. None of the above

D. Remains the same

6461. The Q of a tuned amplifier is 50. If the resonant frequency for the amplifier is 1000kHZ, then bandwidth is __________________?
comments icon0

A. 10kHz

B. 30 kHz

C. 20 kHz

D. 40 kHz

6462. In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then _______________?
comments icon0
A. XL increases and XC decreases

B. XL decreases and XC increases

C. Both XL and XC increase

D. Both XL and XC decrease

6463. At series resonance, voltage across L is____________voltage across C?
comments icon0

A. Less than but in phase with

B. Equal to but opposite in phase to

C. Greater than but in phase with

D. Equal to but in phase with

6464. A class C amplifier always drives _____________load?
comments icon0
A. A resonant tank

B. A pure capacitive

C. A pure inductive

D. A pure resistive

6465. Double tuned circuits are used in ____________ stages of a radio receiver?
comments icon0

A. None of the above

B. Output

C. IF

D. Audio

6466. If L/C ratio of a parallel LC circuit is increased, the Q of the circuit______________?
comments icon0

A. None of the above

B. Is decreased

C. Is increased

D. Remains the same

6467. At parallel resonance, the net reactive component circuit current is _______________?
comments icon0

A. Capacitive

B. Zero

C. Inductive

D. None of the above

6468. In the above question, what are the values of cut-off frequencies?
comments icon0
A. 1020 kHz , 980 kHz

B. 1030 kHz , 970 kHz

C. None of the above

D. 140 kHz , 60 kHz

6469. A resonant circuit contains ____________elements?
comments icon0

A. R and L only

B. L and C

C. R and C only

D. Only R

6470. A tuned amplifier is used in ___________ applications?
comments icon0

A. None of the above

B. Low frequency

C. Radio frequency

D. Audio frequency

6471. The Q of a tuned amplifier is generally _________________?
comments icon0

A. Less than 10

B. Less than 5

C. None of the above

D. More than 10
6472. At series resonance, the circuit offers____________ impedance?
comments icon0

A. None of the above

B. Maximum

C. Zero

D. Minimum
6473. In parallel resonance, the circuit impedance is_________________?
comments icon0

A. CR/L

B. C/LR

C. R/LC

D. L/CR
6474. In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then________________?
comments icon0

A. None of the above

B. Line current becomes minimum

C. XL increases and XC decreases

D. XL decreases and XC increases
6475. A tuned amplifier uses__________load?
comments icon0

A. Resistive

B. LC tank

C. Inductive

D. Capacitive

6476. The voltage gain of a tuned amplifier is____________at resonant frequency
comments icon0
A. Maximum

B. Half-way between maximum and minimum

C. Minimum

D. Zero

6477. Tuned class C amplifiers are used for RF signals of________________?
comments icon0
A. None of the above

B. Low power

C. Very high power

D. High power

6478. At series or parallel resonance, the circuit power factor is ________________?
comments icon0

A. 0

B. 1

C. 8

D. 5

6479. The dimensions of L/CR are that of _______________?
comments icon0

A. Farad

B. Henry

C. None of the above

D. Ohm
6480. At series resonance, the net reactive component of circuit current is _______________?
comments icon0

A. Capacitive

B. None of the above

C. Zero

D. Inductive

6481. For frequencies below resonant frequency, a series LC circuit behaves as a _____________ load?
comments icon0

A. Resistive

B. Inductive

C. None of the above

D. Capacitive
6482. For frequencies below the resonant frequency , a parallel LC circuit behaves as a ______________load?
comments icon0

A. Resistive

B. None of the above

C. Capacitive

D. Inductive
6483. At parallel resonance, the line current is_______________?
comments icon0

A. Quite large

B. Minimum

C. Maximum

D. None of the above

6484. If Q of an LC circuit increases, then bandwidth ______________?
comments icon0
A. Decreases

B. Remains the same

C. Insufficient data

D. Increases

6485. At series resonance, the phase angle between applied voltage and circuit is______________?
comments icon0

A. 90o

B. 180o

C. 0o

D. None of the above

6486. A highly conductive material must have___________?
comments icon0

A. easy solderable and drawable quality

B. all of the above

C. highest conductivity

D. good corrosion resistance

E. good mechanical strength

F. lowest temperature co-efficient

6487. Which of the following is an advantage of stranded conductor over equivalent single conductor ?
comments icon0

A. Less liability to break

B. Less liability to kink

C. All of the above

D. Greater flexibility

6488. Superconductors are becoming popular for use in________________?
comments icon0

A. manufacture of bubble memories

B. generating regions free from magnetic field

C. generating electrostatic field

D. generating very strong magnetic field
6489. Platinum is used in_____________?
comments icon0

A. electrical contacts

B. all of the above

C. thermocouple

D. grids of special purpose vacuum tubes

E. heating element in high temperature furnace

6490. Due to which of the following factors the brush wear rate is altered ?
comments icon0
A. All of the above

B. Contact pressure

C. Excessive sparking

D. Speed of the machine

E. Surface conditions of brush and commutator

6491. is the property of absorbing moisture from atmosphere_____________?
comments icon0

A. Viscosity

B. Hygroscopicity

C. Porosity

D. Solubility

6492. The conductivity of a metal is determined by____________?
comments icon0

A. either (A) or (B)

B. the electronic concentration and the mobility of the free electrons

C. none of the above

D. the number of valence electrons per atom

6493. In thermocouples which of the following pairs is commonly used ?
comments icon0

A. Silver-German silver

B. Iron-steel

C. Copper-constantan

D. Aluminium-tin

6494. For a hole which of the following statements is incorrect ?
comments icon0

A. Holes can be considered as a net positive charge

B. Holes may constitute an electric current

C. Holes can exist in certain semiconductors only

D. Holes can exist in any material including conductors
6495. At transition temperature the value of critical field is____________?
comments icon0

A. negative real value

B. zero

C. positive real value

D. complex value

6496. is an element used in semiconductors whose atoms have three valence electrons?
comments icon0

A. Germanium

B. A donor

C. Silicon

D. An acceptor
6497. The forbidden gap in an insulator is________________?
comments icon0

A. small

B. large

C. any of the above

D. nil

6498. Due to which of the following reasons aluminium does not corrode in atmosphere ?
comments icon0
A. Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium

B. Aluminium is a noble metal

C. No reaction with oxygen occurs ft Any of the above

6499. Which of the following materials is used for making coils of standard resistances ?
comments icon0

A. Platinum

B. Copper

C. Nichrome

D. Manganin
6500. __________ is the main constituent of glass?
comments icon0

A. Fe203

B. Si02

C. AI2O3

D. B2O3