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

Question: Quartz crystal is most commonly used in crystal oscillators because:____________?

• 1. It has superior electrical properties
• 2. It is easily available
• 3. It is quite inexpensive
• 4. None of the above

Question: The signal generator generally used in the laboratories is___________oscillator?

• 1. Wien-bridge
• 2. Hartely
• 3. Crystal
• 4. Phase shift

Question: In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?

• 1. Increased 2 times
• 2. Decreased 4 times
• 3. Increased 4 times
• 4. Decreased 2 times

Question: In Colpitt’s oscillator, feedback is obtained___________?

• 1. By magnetic induction
• 2. By a tickler coil
• 3. From the centre of split capacitors
• 4. None of the above

Question: For an oscillator to properly start, the gain around the feedback loop must initially be_________?

• 1. 1
• 2. Greater than 1
• 3. Less than 1
• 4. Equal to attenuation of feedback circuit