HAL  Placement Paper   Candidate Experiences   Not Specified-25 Apr 2009

HAL  Placement Paper   Candidate Experiences   Not Specified-25 Apr 2009

  • Posted by  FreshersWorld 
    7 Jan, 2012


    HAL Paper

    Diploma Trainee (Electronics)

    Exam. Held on 26 Apr 2009-04-29

    General Knowledge:-  30 Question

    Electronics: - 70 Questions 

    General Knowledge


    1. Lucknow is popular for which fruit
    2. a)Mango         b) Orange         c) Water fruit
    1. Governor of Uthar Pradesh
    2. President of India
    3. In which district of UP a oil refinery is found
    4. Pigeon is the indication of
    5. The chemical Formula of salt
    6. Republic day in India is celebrated on
    7. The ?Beating the retreat? hasn?t celebrated on republic day, what is its reason?
    8. Lucknow city is located near which river
    9. Firozabad is popular for
    10. Renukot is popular for
    11. The first prime minister of India
    12. The first President of India
    13. The birth day of Pandit Jawahar Lal Nehru is celebrated as:-
    14. The writer of ?Godan?
    15. Word ?Agfa? is related to:--

    Electronics Questions

    1.      When the temperature of the room increased then the energy of semiconductor?

    2.      Power diode is generally made from: - Silicon/Germanium/Both/None of these

    3.      Thermionic Emission of electron is due to????.

    4.      When the both junction of NPN diode is reverse biased, then the diode is in which mode: -

          a) Active          b) Cutoff          c) Saturation     d) inverted

    5.   Which transistor mode gives the inverted output: -

          a) Common Emitter      b) Common Base         c) Common Collector   d) None of these

    6.   Which coupling gives the higher gain in case of amplifier: -

          a) Capacitor coupling    b) Impedance coupling c) Transformer coupling

    7.   Which distortion is least objectionable in audio amplification: -

          a) Phase    b) Frequency   c) Harmonic   d) Intermediation

    8.   A narrowband amplifier has a band pass nearly????of central frequency:-

          a) 33.3%          b) 10%             c) 50%

    9.   Frequency of wein bridge oscillator

    10. Phase shift oscillator consists: -

          a) RL   b) RC   c) RLC

    11. Crystal oscillator frequency is very stable due to:-

    12. Multivibrater Produces: -

          a) Sine wave     b) Square wave            c) Smooth wave           d) sawtooth

    13. Convert the 101101 Binary number into octal no: -

          a) 65    b) 55    c) 51    d) 45

    14. 10 in BCD: -

          a) 10100          b) 1100            c) 010111        d) None of these

    15. Which PNP device has a terminal for synchronizing purpose:-

          a) SCS             b) Triac            c) Diac             d) SUS

    16. In 3-Phase full converter, the output during overlap is equal to?????..

    17. Addition of indium in semiconductor crystal makes: -

          a) PNP             b) NPN

    18. Free electron exists in which band: -

          a) 1      b) 2      c) 3      d) Conduction band

    19. Ripple factor of half wave rectifier: -

          a) 1.21             b) 0.48             c) 0.5

    20. Efficiency of half wave rectifier: -

    21. Transistor that can be used in enhancement mode:-

          a) NPN            b) UJT             c) JFET            d) MOSFET

    21. Following contributes to harmonic distortion in Amplifier: -

          a) +Ve feedback          b) ?Ve feedback          c) Defective active device

          22. High cutoff frequency: -

                a) CB               b) CC              c) CE

    23. Which is used as data selector?

          a) Encoder       b) Decoder       c) modulator     d) Demodulator

    24. Read write capable memory: -

          a) RAM           b) ROM           c) Both             d) None of these

    25. When modulation frequency is doubled, modulation index also doubled in case of: -

          a) FM              b) PM              c) AM              d) PM & FM

    26. Term ?Noise temperature? is used for

    27. Video detector used in TV receiver is a?.

          a) Diode detector         b) Ratio detector          c) Phase detector

    28. Which isn?t directly operated from mains: -

          a) Half wave rectifier     b) Centre tap rectifier    c) Bridge rectifier d) Voltage doubler

    29. In 3-Phase half wave rectifier each diode conducts for duration of: -

          a) 30 Degree    b) 45 Degree    c) 60 Degree    d) 180 Degree

    30. If number of phase in a multiphase rectifier increased then: -

          a) Output increased      b) Output decreased     c) Output smooth          d) No change

    31. Which output requires minimum filtration: -

          a) Half wave rectifier     b) full wave       c) SCR half wave rectifier d) Voltage doubler   

    32. Identify the under circuit

    a) Low pass filter    b) High pass filter          c) Band pass filter

    33. Transistor is a following operated device: -

    a)      Low voltage & low current device

    b)      Low voltage & high current device

    c)      Low current & high voltage device

    d)      High current & high voltage device

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