ainfoera.com – MCQs, Mock Tests | Electrical engineering Audio Video Engineering MCQs set -3

1 What is termed as a transducer that converts acoustic sound pressure variation into the electrical signal of same amplitude, frequency and in the same proportion as pressure variations?

A Microphone B Sensitivity C Distortion D Directivity

✅ Correct Answer: 1

2 What is defined as the electrical signal in audible range (20 Hz to 20 KHz) in a microphone?

A Video signal B Audio signal C Transmission signal D Mixed signal

✅ Correct Answer: 2

3 What is termed as the ratio of output of microphone in the presence of sound to output of microphone in the absence of sound with logarithmic base of 20?

A Frequency response B Distortion C Directivity D Signal-to-noise ratio

✅ Correct Answer: 4

4 What is related to uneven response to audio signals in microphone?

A Distortion B Directivity C Frequency response D Signal-to-noise ratio

✅ Correct Answer: 1

5 What should be the distortion to maintain the quality of microphone and Hi-Fi systems?

A Less than 5%, less than 1% B Less than 10%, less than 77% C Less than 100%, less than 45% D Less than 1000%, less than 97%

✅ Correct Answer: 1

6 What is the percent of lobe present in rear of supercardioid microphone?

A 25, 75 B 37, 63 C 20, 89 D 67, 99

✅ Correct Answer: 2

7 What is the percent of broader lobe present in rear of hypercardioid microphone?

A 67, 99 B 20, 89 C 37, 63 D 25, 75

✅ Correct Answer: 4

8 Which is the correct expression for the output impedance of microphone?

A Î© B Î» C Î¸ D v

✅ Correct Answer: 1

9 What is defined as the speaker which covers low audio frequencies?

A Woofer B Squawker C Tweeter D Crossover network

✅ Correct Answer: 1

10 What is defined as the speaker which covers high audio frequencies?

A Tweeter B Squawker C Woofer D Crossover network

✅ Correct Answer: 1

11 What is defined as the speaker which covers mid audio frequencies?

A Woofer B Tweeter C Crossover network D Squawker

✅ Correct Answer: 4

12 What is called the combination of low-pass and high-pass filter?

A Band-pass filter B Passive filter C All-pass filter D Band-stop filter

✅ Correct Answer: 1

13 Which of the following system have a reserve power handling capacity?

A Microphones B Loudspeakers C Multi-way speakers D Blue ray

✅ Correct Answer: 3

14 Which control is required in multi-way speaker system that may be balanced one against the other to give the particular feeling of concert hall?

A Volume B Video C Pitch D Frequency

✅ Correct Answer: 1

15 Which of the following loudspeaker is used to achieve the high power output of more than 25 watts?

A Horn type B Electrodynamic C Cone type D Carbon

✅ Correct Answer: 2

16 Which type of transformer does horn act in the horn type loudspeaker?

A Acoustic B Grounding C Phase-shifting D Power

✅ Correct Answer: 1

17 What is the efficiency of a horn type loudspeaker?

A 5 to 10% B 75 to 100% C 5 to 7% D 30 to 50%

✅ Correct Answer: 4

18 What is the distortion in horn type speaker?

A 50% B 15% C 25% D Less than 5%

✅ Correct Answer: 4

19 What is the SNR (Signal to Noise Ratio) of the horn type microphone?

A 40 dB to 60 dB B 4 dB to 6 dB C 70 dB to 100 dB D 40 dB to 80 dB

✅ Correct Answer: 1

20 What is the range of a very low impedance microphone?

A 0 to 50 Î© B 50 to 100 Î© C 1000 to 1500 Î© D 100 to 600 Î©

✅ Correct Answer: 1

21 What is the range of a high impedance microphone?

A 50 to 100 Î© B 100 to 600 Î© C 750 Î© and above D 500 to 550 Î©

✅ Correct Answer: 3

22 On which principle is the working of moving coil microphone based?

A High impedance B Low impedance C Electromagnetic Induction D Medium impedance

✅ Correct Answer: 3

23 What type of permanent magnet is used with Central pole piece and peripheral pole piece in moving coil microphone?

A Pot B Ribbon C Cardioid D Crystal

✅ Correct Answer: 1

24 In which type of microphone we can speak from a distance of half meter or 25cm?

A Ribbon B Cardioid C Crystal D Moving coil / dynamic

✅ Correct Answer: 4

25 Which of the following microphone is also called pressure gradient and velocity microphone?

A Cardioid B Electret C Moving coil D Ribbon

✅ Correct Answer: 4

26 Which of the following microphone is mostly used in dramas and concerts?

A Electret B Capacitor C Ribbon D Moving coil

✅ Correct Answer: 3

27 Which of the following microphone have the directivity pattern shaped like a heart?

A Ribbon B Cardioid C Moving coil D Capacitor

✅ Correct Answer: 2

28 Which of the following microphone is costlier than other microphones?

A Moving coil B Ribbon C Carbon D Cardioid

✅ Correct Answer: 2

29 On which principle is the working of crystal microphone based?

A High impedance B Medium impedance C Piezoelectric effect D Electromagnetic Induction

✅ Correct Answer: 3

30 On which microphone ceramic can work on high temperature upto 100 degree Celsius?

A Ribbon B Crystal C Moving coil / dynamic D Carbon

✅ Correct Answer: 2

31 In which form the mechanical force on the crystal is developed in both directions when there is pressure of sound waves?

A Compressions and rarefactions B Compressions C Rarefactions D Neither compressions nor rarefactions

✅ Correct Answer: 1

32 Which type of microphone is used for mobile communications?

A Crystal B Capacitor C Carbon D Electret

✅ Correct Answer: 1

33 What is the capacitor equation for the capacitance microphone?

A C = kA / d B C = kA + d C C = kA â€“ d D C = kA * d

✅ Correct Answer: 1

34 What is the output impedance of capacitor microphone?

A 25 Î© B 0.25 Î© C 1 Î© D 100 MÎ©

✅ Correct Answer: 4

35 Which type of microphone is used in sound level meter?

A Electret B Capacitor C Crystal D Carbon

✅ Correct Answer: 2

36 Which of the following microphone is coated with thin layer of Teflon at the back plate?

A Electret B Capacitor C Carbon D Crystal

✅ Correct Answer: 1

37 Which of the following is used as tie-clip microphone?

A Cardioid B Carbon C Capacitor D Electret

✅ Correct Answer: 4

38 What happens to the resistance of carbon microphone when carbon granules are pressed and the current through the circuit increases?

A Increases B Decreases C Constant D Increases and decreases

✅ Correct Answer: 2

39 What is the equation for the instantaneous current through load resistor in carbon microphone?

A I = E / R + Î´r B J = E / r + Î´r C J = E / R + Î´r D I = D / R + Î´r

✅ Correct Answer: 1

40 Which of the following microphone has the lowest cost in compare to other microphones?

A Cardioid B Capacitor C Electret D Carbon

✅ Correct Answer: 4

41 Which of the following microphones is used only in telephones?

A Moving coil B Ribbon C Carbon D Electret

✅ Correct Answer: 3

42 What is the distortion in carbon microphone?

A 5% B 1% C 500% D 10%

✅ Correct Answer: 4

43 Which of the following microphone is used for lecture delivery in the class/hall?

A Lavalier B Noise cancelling C Shot-gun type D Fiber optical

✅ Correct Answer: 1

44 Which of the following microphone is an electret type small microphone?

A Fiber optical B Shot-gun type C Noise cancelling D Tie-clip

✅ Correct Answer: 4

45 Which type of microphone is used in sports for oath taking ceremony?

A Shot-gun type B Noise cancelling C Fiber optical D Radio (wireless)

✅ Correct Answer: 4

46 In which of the following microphone two matching transducing elements are used?

A Radio (wireless) B Fiber optical C Noise cancelling D Shot-gun type

✅ Correct Answer: 3

47 Which microphone is mounted on a long pole and operated by an audio crew member or assistant?

A Shot-gun type B Fiber optical C Digital interface D Lavalier

✅ Correct Answer: 1

48 On which microphone monitoring on headphone is very much important?

A Lavalier B Digital interface C Shot-gun type D Fiber optical

✅ Correct Answer: 3

49 Which microphone provides interference free communication in electrically noisy channel?

A Fiber optical B Shot-gun type C Lavalier D Digital interface

✅ Correct Answer: 1

50 Which of the following microphones is used in highly explosive areas and nuclear plants?

A Digital interface B Shot-gun type C Fiber optical D Ribbon

✅ Correct Answer: 3

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Audio Video Engineering MCQs set -3