Solid State Devices

121. Silicon that has been doped with a pentavalent impurity is called a/an

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

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122. Silicon that has been doped with a trivalent impurity is called a/an

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

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123. Structural category of a semiconductor diodes can be either

1. Electrolytic and point contact
2. Junction and point contact
3. Electrolytic and vacuum
4. Vacuum and gaseous

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124. Suppose a JFET has I_DSS = 7 mA and V_GS(off) = -3 V. calculate the drain current for a gate-source voltage of -1V.

1. 3.1 mA
2. 0.455 A
3. 4.45 mA
4. 31.2 mA

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125. Termed as unwanted oscillation that may occur in most any type of circuits, oscillator, amplifier, power supply, receiver and transmitters

1. White noise
2. Parasitic oscillations
3. Ripple
4. Pulsating dc signal

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126. The _________ as fundamental particle is considered as a bundle of radiant energy or light, the amount energy being related to the frequency.

1. Protons
2. LED
3. Photons
4. Comet

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127. The _________ transistor configuration has the highest value of input resistance.

1. Common base
2. Common emitter
3. Emitter-stabilized
4. Common collector

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128. The amount of additional energy required to emit an electron from the surface of metal is called

1. Potential barrier
2. Junction voltage
3. Work function
4. Knee voltage

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129. The amount of time between the creation and disappearance of a free electron.

1. Recombination time
2. Bonding time
3. Lifetime
4. Propagation time

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130. The arrow in semiconductor symbol

1. Always points towards the P region and away from the N region
2. Always points towards the N region and away from the P region
3. Is not a significant symbol
4. Always points toward the PN junction

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