AMPLIFIERS Question 1

 ___________ invented the three-element vacuum tube which became the basis of all electronic devices and he called it the Audion? A Lee De Forest B Guglielmo Marconi C Thomas Edison D Ambrose Fleming Question 2

 Which of the following formula does Ohms Law represent?

 A P = I*V B R = V*I C V = P/I D I = V/R Question 3

 _________ is a Scottish inventor and the watt was named after him.

 A Alessandro Volta B Andre Maria Ampere C James Watt D George Simon Ohm Question 4

 The main features of a large-signal amplifier is the circuit's ________

 A impedance matching to the output device B maximum power limitations C power efficiency D all of the above Question 5

 Which class of amplifier operates in the linear region for only a small part of the input cycle?

 A C B B C AB D A Question 6

 Amplifiers designed to handle AC signals are called _______

 A thin signal amplifiers B large signal amplifiers C small signal amplifiers D thick signal amplifiers Question 7

 Maximum efficiency produced by Class B amplifier is _______

 A 79% B 84% C 60% D 50% Question 8

 The power rating of a transistor can be effectively increased ______

 A by using slow-blow fuses B by using heat sinks C by reducing power supply voltages D by using bigger transistors Question 9

 Which of the following is not one of the parameters of amplifier?

 A Feedback B Cooler C Frequency D Gain Question 10

 An amplifier that conducts during the full cycle, or has a conducting angle of 360 degrees is known as a __________

 A Class AB Power Amplifier B Class B Power Amplifier C Class C Power Amplifier D Class A Power Amplifier Question 11

 What is the output voltage, if a transistor amplifier has a voltage gain of 100 and input voltage is 75mV?

 A 13.3V B 1.33V C 15V D 7.5V Question 12

 Which type of power amplifier is biased for operation at less than 180º of the cycle?

 A Class C B Class D C Class A or AB D Class A Question 13

 What is the voltage across the capacitor in the given circuit? A 16.1V B 22.9V C 6.8V D 11.9V Question 14

 What is the advantage of extending the bandwidth of audio amplifiers to frequencies higher than the audible limit?

 A to preserve wave shape B to increase efficiency C to reduce noise D to reduce transients Question 15

 Which of the following device represents the coupled carbon microphone which is used as crude amplifiers in telephone repeaters

 A B C D At the end of the test, press the 'CHECK' button