Solid State Devices

31. A nuclei with a common number of protons, but with different number of neutrons

1. Fission
2. Isotope
3. Atom
4. Core

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32. A photodiode which conducts current only when forward biased and is exposed to light.

1. LAD
2. LED
3. PIN
4. Photoconductor

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33. A positive charge outside the nucleus which is present only in semiconductor due to unfilled covalent bonds.

1. Electron
2. Proton
3. Hole
4. Neutron

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34. A semiconductor in its purest form is called

1. Pure semiconductor
2. Doped semiconductor
3. Intrinsic semiconductor
4. Extrinsic semiconductor

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35. A semiconductor is an element with a valence of

1. Four
2. Eight
3. Two
4. One

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36. A silicon crystal is a/an _________ of a semiconductor if every atom in the crystal is a silicon atom.

1. Extrinsic
2. Intrinsic
3. P-type
4. N-type

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37. A silicon crystal is an intrinsic semiconductor

1. If every atom in the crystal is a silicon atom
2. If majority of the atoms in crystal is a silicon atom
3. If the crystal contains 14 silicon atoms
4. If the crystal is undoped

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38. A silicon diode has a maximum allowable junction temperature of 150°C. Find the maximum allowable power dissipation at 25°C temperature if the diodes thermal resistance is 0.4 °C/mW.

1. 238 mW
2. 313 mW
3. 600 mW
4. 117 mW

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39. A special type of diode which is often used in RF switches, attenuators and various types of phase shifting devices is called

1. Zener diode
2. PIN diode
3. Tunnel diode
4. Varactor diode

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40. A special type of semiconductor diode which varies its internal capacitance as the voltage applied to its terminal varies.

1. Varactor diode
2. Point contact diode
3. Zener diode
4. Silicon controlled rectifier

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