10 Which of the following types of oscillators is used to ge

10. Which of the following types of oscillators is used to generate RF signals below 1,000 MHz, and also to generate AF signals? A. Multivibrator oscillator B. Armstrong oscillator C. Colpitts oscillator D. Hartley oscillator

11. The percent of frequency error is determined by dividing the error by the operating frequency and multiplying by 100. What would be the percent of frequency error of an oscillator that operates at 40 MHz when the oscillator is off by 2,000 Hz? A. 0.005% B. 0.02% C. 0.0005% D. 0.002%

12. Which of the following circuits is widely used to interface high-speed digital data circuits, and also to protect computers from the high-voltage circuits they control? A. The Colpitts oscillator B. The phase-shift oscillator C. The twin-T oscillator D. The optical isolator circuit

13. Look at the block diagram shown in the figure above. According to the information provided by the diagram, the frequency of the offset oscillator is _______ MHz.
A. 6.1
B. 10.7
C. 2.5
D. 0
14. A diathermy machine is considered a member of the _______-heater family.
A. dielectric B. conduction C. induction D. infrared
15. In an amplifier with a very high gain, undesired oscillations are called _______ oscillations.
A. parasitic B. impaired C. unwarranted D. square-wave

18. To determine the frequency at which feedback occurs in a sound system, you can use an instrument called a A. function generator. B. transformer. C. graphic equalizer. D. Hartley oscillator.

19. Determine the percent of frequency error of an oscillator that operates at 30 MHz when the oscillator is off by 1,500 Hz. A. 0.0005% B. 0.002% C. 0.005% D. 0.02%

Solution

10) B-Armstrong oscillator

11) B. 0.02% C

12) D. The optical isolator circuit

13) D. 0

14) A. dielectric

15) A. parasitic

18)  D. Hartley oscillator.

19) C. 0.005%