Question: In a certain oscillator Av = 50. The attention of the feedback circuit must be___________?

• 1. 1
• 2. 01
• 3. 10
• 4. 02

Question: ____________is a fixed frequency oscillator?

• 1. Phase-shift oscillator
• 2. Hartely-oscillator
• 3. Colpitt’s oscillator
• 4. Crystal oscillator

Question: An important limitation of a crystal oscillator is____________?

• 1. Its low output
• 2. Its high Q
• 3. Less availability of quartz crystal
• 4. Its high output

Question: The Q of the crystal is of the order of____________?

• 1. 100
• 2. 1000
• 3. 50
• 4. More than 10,000

Question: In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency____________?

• 1. Remains the same
• 2. Decreases
• 3. Increases
• 4. Insufficient data

Question: A second condition for oscillations is____________?

• 1. A gain of 1 around the feedback loop
• 2. No gain around the feedback loop
• 3. The attention of the feedback circuit must be one-third
• 4. The feedback circuit must be capacitive

Question: An oscillator differs from an amplifier because it_____________?

• 1. Has more gain
• 2. Requires no input signal
• 3. Requires no d.c. supply
• 4. Always has the same input

Question: The piezoelectric effect in a crystal is___________?

• 1. A voltage developed because of mechanical stress
• 2. A change in resistance because of temperature
• 3. A change in frequency because of temperature
• 4. None of the above

Question: In an LC circuit, when the capacitor is maximum, the inductor energy is____________?

• 1. Minimum
• 2. Maximum
• 3. Half-way between maximum and minimum
• 4. None of the above

Question: A Wien bridge oscillator uses___________feedback?

• 1. Only positive
• 2. Only negative
• 3. Both positive and negative
• 4. None of the above