Question: One condition for oscillation is_____________?

• 1. A phase shift around the feedback loop of 180o
• 2. A gain around the feedback loop of one-third
• 3. A phase shift around the feedback loop of 0o
• 4. A gain around the feedback loop of less than 1

Question: The crystal oscillator frequency is very stable due to___________of the crystal?

• 1. Rigidity
• 2. Vibrations
• 3. Low Q
• 4. High Q

Question: In a phase shift oscillator, the frequency determining elements are _______________?

• 1. L and C
• 2. R, L and C
• 3. R and C
• 4. None of the above

Question: Hartley oscillator is commonly used in______________?

• 1. Radio receivers
• 2. Radio transmitters
• 3. TV receivers
• 4. None of the above

Question: In an LC oscillator, the frequency of oscillator is____________L or C?

• 1. Proportional to square of
• 2. Directly proportional to
• 3. Independent of the values of
• 4. Inversely proportional to square root of

Question: The output impedance of an emitter follower is______________?

• 1. High
• 2. Very high
• 3. Almost zero
• 4. Low

Question: When negative voltage feedback is applied to an amplifier, its voltage gain ____________?

• 1. Is increased
• 2. Is reduced
• 3. Remains the same
• 4. None of the above

Question: The value of negative feedback fraction is always _______________?

• 1. Less than 1
• 2. More than 1
• 3. Equal to 1
• 4. None of the above

Question: If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is_____________?

• 1. 10
• 2. 1
• 3. 01
• 4. 15

Question: The gain of an amplifier with feedback is known as____________gain?

• 1. Resonant
• 2. Open loop
• 3. Closed loop
• 4. None of the above