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ECE :: Electronic Devices and Circuits

  1. Which of the following materials has the highest electrical conductivity?

  2. A.
    Steel
    B.
    Silver
    C.
    Aluminium
    D.
    Zinc

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  3. In a bipolar transistor

  4. A.
    the base is thick and highly doped
    B.
    the base is thin and highly doped
    C.
    the base is thick and lightly doped
    D.
    the base is thin and lightly doped

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  5. Hay bridge is suitable for measuring inductance of which one of the following inductors?

  6. A.
    Having Q value less than 10
    B.
    Having Q value greater than 10
    C.
    Having any value of Q
    D.
    Having phase angle of reactance very large

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  7. When a substance is repelled by a magnetic field it is known as

  8. A.
    ferromagnetic
    B.
    antiferromagnetic
    C.
    diamagnetic
    D.
    paramagnetic

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  9. If μn is mobility of free electron and μp is mobility of holes then for silicon at 300 K

  10. A.
    μn = μp
    B.
    μn > μp
    C.
    μn < μp
    D.
    μn may be more or less than μp

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  11. In a specimen of n type semiconductor, the initial concentration of holes and electrons is pno and nno. When the specimen is subjected to radiation, the hole and electron concentration increase to pn and nn. Then

  12. A.
    pn - pno = nn - nno
    B.
    pn + pno = nn + nno
    C.
    pn - pno = nno + nno
    D.
    pn + pno = nn - pno

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  13. Which of the following diode is designed to operate in the breakdown region?

  14. A.
    Signal diode
    B.
    Power diode
    C.
    Zener diode
    D.
    None of the above

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  15. Fill in the suitable word in the blanks is the following questions. The electron in the outermost orbit is called __________ electron.

  16. A.
    valence
    B.
    covalent
    C.
    acceptor
    D.
    donor

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  17. In a triode

  18. A.
    grid is nearer to cathode than anode
    B.
    grid is nearer to anode than cathode
    C.
    grid is equidistant from anode and cathode
    D.
    any of the above

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  19. The output characteristics of a bipolar transistor has three distinct regions. They are known as

  20. A.
    saturation region, active region and breakdown region
    B.
    inactive region, active region and breakdown region
    C.
    inactive region, saturation region and active region
    D.
    inactive region, saturation region and breakdown region

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