Solid State Devices

51. An equivalent circuit of a diode in which it is represented as a switch in series with a barrier potential.

1. First approximation
2. Second approximation
3. Third approximation
4. Fourth approximation

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52. An extrinsic semiconductor is a

1. Doped semiconductor
2. Pure semiconductor
3. Good insulator
4. Good conductor

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53. An extrinsic semiconductor produces _________ when a pentavalent atom is added to the molten silicon

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

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54. An ideal diode

1. Should have a zero resistance in the forward bias as well as in reverse bias
2. Should have an infinitely large resistance in the forward bias and zero resistance in reverse bias
3. Should have zero resistance in forward bias and an infinitely large resistance in reverse bias
4. Should have infinitely large resistance in forward as well as reverse bias

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55. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

1. Doping
2. Thermal energy
3. Free electrons
4. Valence electrons

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56. An LED and phototransistor is equivalent to a/an

1. Thermocouple
2. FET
3. Optocoupler
4. Regulator

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57. another name for a light activated diode (LAD) is

1. IR emitter
2. LED
3. Photodiode
4. LCD

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58. Another name for metal-oxide semiconductor field effect transistor is

1. JFET
2. GFET
3. IGFET
4. Transistor

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59. Another name for saturation current in a diode, which arises from the fact that it is directly proportional to the cross-sectional are of the diode.

1. Steady-state current
2. Constant current
3. Thermal current
4. Scale current

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60. Approximate energy gap in insulator is

1. Eg = > 5 eV
2. Eg = 1.1 eV
3. Eg = 0.67 eV
4. Eg = 4 eV

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