Oscillator MCQs

31. Oscillators are widely used in

1. Radio broadcasting
2. Television broadcasting
3. Radio and television receiver
4. All of these

32. If you need to design a relaxation oscillator circuit. The most likely device to use might be

1. A SCR
2. A UJT
3. A TRIAC
4. All of these

33. Crystal oscillator uses

1. Silicon crystal
2. Germanium crystal
3. Crystal diode
4. Piezo-electric quartz crystal

34. For audio applications, which of the following is most common oscillator

1. Crystal oscillator
2. LC oscillator
3. RC oscillator
4. None of these

35. Frequency of oscillation of Colpitts oscillator is given by

1.  $f_o=\frac{1}{2\pi\sqrt{\frac{L}{C_{eq}}}}$
2. $f_o=\frac{1}{2\pi\sqrt{LC_{eq}}}$
   
3. $f_o=\frac{1}{2\pi\sqrt{\frac{C_{eq}}{L}}}$
   
4. None of these

36. The frequency of oscillations of a phase shift oscillator is

1.  $\frac{1}{2\pi RC\sqrt{6}}$
2. $\frac{1}{2\pi\sqrt{6RC}}$
3. $\frac{1}{2\pi\sqrt{RC}}$
4. $\frac{1}{2\pi RC}$

37. Which of the following is the fixed frequency oscillator?

1. Colpitts
2. Crystal
3. Hartley
4. Wien bridge

38. Colpitt’s oscillator works in ___________ mode.

1. Class A
2. Class B
3. Class C
4. Class AB

39. Crystal oscillator is a constant frequency oscillator due to

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

40. A hartley oscillator generates

1. very low frequency oscillation
2. radio-frequency oscillation
3. microwave oscillation
4. audio-frequency oscillation