oscillators and multivibrators

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Oscillators and Multivibrators

1. Which condition must exist fora circuit to oscillate?

A. It must have a negativefeedback sufficient tocancel the input

B.It must have a gain ofless than 1

C. It must have a positivefeedback sufficient toovercome losses

D. It must be neutralized

2. Which of the following is notan essential part of anoscillator?

A. Source of energy thatsupply the losses in tankcircuit.

B. A resistor IC combinationcircuit.

C. Resonant circuit consistof inductance andcapacitance.

D. Regenerative feedbackcircuit.

3. Circuits that producesalternating or pulsatingcurrent or voltage.

A. Damper

B.Generator

C. oscillator

D. mixer

4. What do you call the oscillatorcircuit that uses a tapped coliin the tuned circuit?

A. Pierce

B. Colpitts

C. Hartley

D. Ultraudion

5.

What determines the resonantfrequency of a crystal?

A. external components

B. the temperature of thecrystal

C. the size and thickness ofthe crystal material

D. the hermitic seal

6. Type of oscillator whosefrequency is dependent on thecharge and discharge of RCnetworks.

A. Hartley oscillator

B. Copitts oscillator

C. Relaxation oscillator

D. Klystron oscillator

7. A microwave oscillator

A. Hartley oscillatorB. Copitts oscillator



8. A self-excited oscillator inwhich the tank is divided intoinput and feedback portions bya capacitive voltage divider.

A. Hartley capacitor




9. A self-excited oscillator inwhich the tank is divided intoinput and feedback portions byan inductive voltage divider ora tapped coil.

A. Hartley oscillator




10.A circuit usually containingtwo transistors or tubes in an

RC-coupled amplifier, the twoactive devices switch eachother alternately on and off.

A. Multivibrator

B. Signal generator

C. OscillatorD. Thyristor

11. A multivibrator that generatesone output pulse for each inputtrigger pulse.

A. monostable

B. astable

C. bistable

D. tristate

12. Monostable multivibrator is

also known asA. one shot

B. single shot

C. direct shot

D. one shot or single shot

13. What determines the pulse timein a monostable multivibrator?

A. resistor combinations

B. capacitor combinations

C. inductor combinations

D. resistor and capacitor

combinations

14. A multivibrator having twostable state

A. monostable

B. bistable

C. astable

D. unstable

15. Is also known as Eccles/Jordancircuit

A. Monostable multivibrator

B. bistable multivibrator

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C. astable multivibrator

D. unstable multivibrator

16. Flip-flop is actually a _______multivibrator.

A. Monostable

B. bistable

C. astable

D. unstable

17. Considered as a free-runningmultivibrator

A. monostable

B. bistable

C. astable

D. unstable

oscillators and multivibrators

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