DFCCIL Placement-Paper on Dec 2012

Discussion in 'Latest Placement papers' started by krishna, Oct 3, 2013.

  1. krishna

    krishna Banned

    Dedicated Freight Corridor Corporation of India (DFCCIL)
    1. What does LED stand for?
    Light Emitting Display
    Low Energy Display
    Light Emitting Diode-Answer
    Light Emitting Detector

    2. Name the three leads of a common transistor
    Collector Bias Omitter
    Base Collector Case
    Emitter Collector Bias
    Collector Base Emitter-Answer

    3. Connecting a lead from the negative to the positive of a battery will produce:
    A high resistance circuit
    A short circuit-Answer
    A low current path
    An open circuit

    4. What is the approximate characteristic voltage that develops across a red LED?

    1.7v-Answer
    3.4v
    0.6v
    5v

    5. If two resistors are placed in series, is the final resistance:
    Higher-Answer
    Lower
    he same
    Cannot be determined

    6. Which is not a "common" value of resistance:
    2k7
    1M8
    330R
    4k4-Answer

    7. If a small value of capacitance is connected in parallel with a large value, the combined capacitance will be:
    The same
    Higher-Answer
    Lower

    8. If the voltage on the base of a transistor increases, does it:
    Turn on
    Turn off
    Not enough information-Answer
    Remain the same

    9. The resistor identified in brown is called the:


    Base Bias Resistor
    Load Resistor
    Emitter Feedback Resistor
    Bypass Resistor-Answer

    10. A 100n capacitor in parallel with 10n produces:
    90n
    100n
    110n-Answer
    Cannot be determined

    11. A resistor with colour bands: red-red-red-gold, has the value:
    22k 5%
    2k2 5%-Answer
    220R 5%
    22R 5%

    12. The lead marked with the arrow is:


    The Collector
    The Base
    The Emitter-Answer
    The case

    13. A 10k resistor in parallel with 10k produces:
    10k
    5k-Answer
    20k
    Cannot be determined

    14. The symbol is:


    NPN Transistor
    PNP Transistor-Answer
    Photo Transistor
    Field Effect Transistor

    15. Two 3v batteries are connected as shown.
    The output voltage is:



    3v
    0v-Answer
    6v

    16. 4 resistors in ascending order are:
    22R 270k 2k2 1M
    4k7 10k 47R 330k
    3R3 4R7 22R 5k6-Answer
    100R 10k 1M 3k3


    17. The closest value for this combination is:


    4k7
    2k3-Answer
    9k4

    18. This stage is called:


    Common Base
    Common Collector
    Common Emitter-Answer
    Emitter Follower



    19. The four symbols are:
    Capacitor, Microphone, Potentiometer, Electrolytic-Answer
    Electrolytic, Microphone, Resistor, Capacitor
    Capacitor, Piezo, Resistor, Electrolytic
    Electrolytic, Coil, Resistor, Capacitor

    20. The value of the combination is:


    100n
    200n-Answer
    50n

    21. The resistor marked in red is:


    Base Bias Resistor-Answer
    Load Resistor
    Emitter Feedback Resistor
    Bypass Resistor

    22. A resistor and capacitor in series is called a:

    Pulse Circuit
    Timing Circuit/Delay Circuit-Answer
    Oscillator Circuit/Frequency Circuit
    Schmitt Circuit

    23. A red-red-red-gold resistor in series with an orange-orange-orange-gold resistor produces:


    5k5
    35,200 ohms-Answer
    55k
    None of the above

    24. Name the 4 components:

    Photo transistor, switch, capacitor, coil
    Transistor, mercury switch, piezo, coil
    Photo transistor, reed switch, piezo, coil
    Photo darlington transistor, reed switch, piezo, coil-Answer

    25. To obtain a higher value of resistance, resistors are connected in:


    Reverse
    Forward
    Parallel
    Series-Answer

    26. A capacitor and coil in parallel is called:


    A Tuned Circuit-Answer
    A Timing Circuit
    A Delay Circuit
    A Schmitt Circuit


    27. When the base is raised, the emitter will:


    Rise-Answer
    Fall
    Remain Fixed
    Oscillate

    28. What is 1,000p?


    0.01n-Answer
    0.0001u
    0.1n
    1n

    29. The current in a circuit is 45mA. This is:
    0.045Amp-Answer
    0.00045A
    0.0045A
    0.45A

    30. A 100n capacitor can be expressed as:
    0.1u u = microfarad-Answer
    0.01u
    0.001u
    none of the above

    31. 1mA is equal to:
    0.001A-Answer
    0.00001A
    0.01A
    0.1A

    32. 1,200mV is equal to:
    12v
    1.2v-Answer
    0.12v
    0.0012v

    33. If a 10k resistor is placed across a 10v supply, the current will be:
    10mA
    1mA-Answer
    0.01mA
    0.1mA

    34. This arrangement is called:


    Common Emitter
    Common Collector/Emitter Follower-Answer
    Common Base

    35. Identify the correctly connected LED:

    A
    B-Answer
    C
    D

    36. Identify the correct statement:


    The cathode lead is longer. It goes to the negative rail
    The cathode lead is shorter. It goes to the negative rail-Answer
    The cathode lead is shorter. It goes to the positive rail
    The cathode lead is longer. It goes to the positive rail

    37. The current requirement of a LED is:
    1.7mA
    25mA
    Between 3 and 35mA-Answer
    65mA

    38. The signal at the collector will be . .

    .
    Answer inverted


    39. The purpose of the capacitor:


    To pass AC on the input to the base
    To allow the transistor to self-bias
    Block DC from the input line-Answer
    To allow the stage to operate

    40. The direction of conduction for a diode is:


    answer-A

    41. A DC voltage . . .
    rises and falls
    is a sinewave
    remains constant-Answer
    is an audio waveform

    42. A CRO is a
    Cathode Ray Oscillator
    Cathode Ray Oscilloscope-Answer
    Capacitor-Resistor Oscillator
    Capacitor-Resistor Output

    43. These jargon terms mean: (Jargon = language peculiar to a 'mickey' 'electro' 'cap' 'puff'; trade)

    mighty, electronic, capper, picofarad
    microfarad, electronic, capacitor, picofarad
    microfarad, electrolytic, capacitor, picofarad-Answer
    microfarad, electrolyte, capping, blow

    44. The tolerance bands: gold; silver; brown, represent:
    10%, 5%, 1%
    5%, 10%, 2%
    5%, 10%, 1%-Answer
    10%, 5%, 2%

    45. 223 on a capacitor represents:
    0.022u u = microfarad-Answer
    22n n = nanofarad
    22,000p p = picofarad
    All of the above

    46. Arrange these in ascending order: n, p, u
    p, u, n,
    n, u, p
    p, n, u-Answer

    47. Name this symbol:


    A buffer
    A NOR gate
    A NAND gate
    A Schmitt Trigger-Answer

    48. The number "104" on a capacitor indicates:
    0.1u
    100n-Answer
    1n
    10n

    49. What is the multimeter detecting:

    The output voltage of the Schmitt Trigger
    The delay across the capacitor
    The voltage across the capacitor-Answer
    The current through the capacitor

    50. For the XOR gate, what is the output when both inputs are HIGH:

    HIGH
    LOW-Answer
    Can be HIGH or LOW
    Cannot be determined

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