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Top 50 Electronics Questions and Answers
General Electronics Questions and Answers Part 1 (Questions 1-15)
1) The receiving antenna intercepts a portion of this wave. Which wave?
Answer: Radiated.
2) It is a process of allowing an electric current to flow only in one direction that is changing A.C into D.C.
Answer: Rectification.
3) A radio demodulates the information contained in the:
Answer: Radio waves.
4) What is oscillation?
Answer: It is a process of conversion of D.C into a signal of the desired frequency.
5) Which selects and amplifies the desired transmitted signal?
Answer: Radio receiver.
6) Which of the electronics is known as wonder child of electronics?
Answer: Transistor.
7) Which are the three most important characteristics of a radio receiver?
Answer: Sensitivity, selectivity, and fidelity.
8) The third electrode in a triode is known as?
Answer: Control grid.
9) Which performs to the ability of a radio receiver to detect weak signals?
Answer: Sensitivity.
10) The thermionic valve named triode has _?
Answer: 3 electrodes.
11) Which pertains to the ability of a radio receiver to exactly reproduce the original information?
Answer: Fidelity.
12) The impurity to be added to get p-type semi-conductor is _?
Answer: Boron.
13) Which receiver converts all incoming frequencies into a fixed frequency?
Answer: Superheterodyne.
14) Current conduction in n-type semi-conductor is due to _?
Answer: Free electrons.
15) Which pertains to the ability of a receiver to receive the tuned frequency in exclusion of other frequencies?
Answer: Selectivity.
Online Electronics General Quiz Questions Part 2 (Questions 16-30)
16) Example of a donor is?
Answer: Antimony.
17) At the input of the receiver, along with the genuine signals, there is always some:
Answer: Noise.
18) The hole is considered as?
Answer: Equivalent of a positive charge.
19) Which converts the demodulated electrical waves into sound waves?
Answer: Loudspeaker.
20) Detection is a kind of _?
Answer: Rectification.
21) Which controls the radio waves in accordance with the information to be transmitted?
Answer: Telegraph Key.
22) The middle region of the transistor is known as?
Answer: Base.
23) This consists of periodic interruptions of continuous radio waves in accordance with a telegraphic code. Name it:
Answer: Radiotelegraphy.
24) The current carriers in NPN transistor consist of _?
Answer: Electrons.
25) This consists of modulation of radio waves by speech or music. Name it:
Answer: Radiotelephony.
26) A function which cannot be done by a junction of a diode is _?
Answer: Oscillation.
27) Which converts sound energy into electric energy?
Answer: Microphone.
28) Greatly facilitated radio communications:
Answer: Triode.
29) Who verified the existence of radio waves in 1887?
Answer: Heinrich Hertz.
30) Who succeeded in spanning the Atlantic with the letter S of the Morse code?
Answer: Guglielmo Marconi.
General Electronics Questions Part 3 (Questions 31-50)
31) What generates the radio frequency waves?
Answer: Radio transmitter.
32) Which keying of the power amplifier is a popular method of keying?
Answer: Plate circuit keying.
33) Several intermediate amplifiers are inserted between the oscillator and the final power amplifier when:
Answer: High output power is required.
34) Which microphone is based on the piezoelectric effect?
Answer: Crystal.
35) What are the distinguishing marks of a microphone?
Answer: Their output and range of frequency response.
36) Which is the process of modifying the amplitude of an rf carrier in accordance with the strength of the audio signal?
Answer: Amplitude modulation.
37) Crystals cannot be obtained that will oscillate well in this band. Which band?
Answer: VHF.
38) A microphone frequency response from 20 to 1500 hz is necessary for this broadcasting. Name it:
Answer: FM.
39) Which changes the amplitude variations of an audio signal into corresponding phase or frequency variations?
Answer: The resistance tube modulator.
40) Which antenna radiates wave into space?
Answer: Transmitting.
41) Which antenna intercepts a portion of the radiated waves?
Answer: Receiving.
42) Who predicted the Existence of electromagnetic waves?
Answer: Clerk Maxwell in 1865.
43) Which electric charges always radiate energy in the form of electromagnetic waves?
Answer: Accelerated.
44) What do we need to radiate or receive electromagnetic waves effectively?
Answer: Antenna.
45) This is a system of elevated conductors, which matches the transmitter or receiver to space. Name it:
Answer: An antenna.
46) The electrical length of a Hertz antenna is a half:
Answer: Wavelength.
47) If the plane of the electric field is horizontal with respect to the earth, the wave is said to be:
Answer: Horizontally polarised.
48) If the electric field is oriented vertically with respect to the earth, the wave is said to be:
Answer: Vertically polarized.
49) Which is primarily a function of’ the antenna orientation?
Answer: The wave polarization.
50) The voltage induced in the receiving antenna is of the same waveform as the:
Answer: Radio waves.
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