Question: Addition of pentavalent impurity to a semiconductor creates many________________?

• 1. Free electrons
• 2. Holes
• 3. Valence electrons
• 4. Bound electrons

Question: When a pure semiconductor is heated, its resistance_________________?

• 1. Goes up
• 2. Goes down
• 3. Remains the same
• 4. Can’t say

Question: A semiconductor has generally_______________valence electrons?

• 1. 2
• 2. 3
• 3. 6
• 4. 4

Question: A semiconductor has ______________ temperature coefficient of resistance?

• 1. Positive
• 2. Zero
• 3. Negative
• 4. None of the above

Question: The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?

• 1. The same as
• 2. Less than
• 3. More than
• 4. None of the above

Question: If the input capacitor of a transistor amplifier is short-circuited, then_________________?

• 1. Transistor will be destroyed
• 2. Biasing conditions will change
• 3. Signal will not reach the base
• 4. None of the above

Question: A CE amplifier is also called _______________ circuit?

• 1. Grounded emitter
• 2. Grounded base
• 3. Grounded collector
• 4. None of the above

Question: If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________?

• 1. High
• 2. Very high
• 3. Moderate
• 4. Low

Question: The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?

• 1. 1000
• 2. A million
• 3. 100
• 4. 10000

Question: The ratio of output impedance of a CE amplifier is _______________?

• 1. About 1
• 2. Low
• 3. High
• 4. Moderate