laboursonline – MCQs, Mock Tests | Electrical engineering Audio Video Engineering MCQs set -3

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?

1. Microphone
2. Sensitivity
3. Distortion
4. Directivity

✅ Correct Answer: 1

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

1. Video signal
2. Audio signal
3. Transmission signal
4. Mixed signal

✅ Correct Answer: 2

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?

1. Frequency response
2. Distortion
3. Directivity
4. Signal-to-noise ratio

✅ Correct Answer: 4

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

1. Distortion
2. Directivity
3. Frequency response
4. Signal-to-noise ratio

✅ Correct Answer: 1

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

1. Less than 5%, less than 1%
2. Less than 10%, less than 77%
3. Less than 100%, less than 45%
4. Less than 1000%, less than 97%

✅ Correct Answer: 1

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

1. 25, 75
2. 37, 63
3. 20, 89
4. 67, 99

✅ Correct Answer: 2

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

1. 67, 99
2. 20, 89
3. 37, 63
4. 25, 75

✅ Correct Answer: 4

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

1. Ω
2. λ
3. θ
4. v

✅ Correct Answer: 1

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

1. Woofer
2. Squawker
3. Tweeter
4. Crossover network

✅ Correct Answer: 1

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

1. Tweeter
2. Squawker
3. Woofer
4. Crossover network

✅ Correct Answer: 1

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

1. Woofer
2. Tweeter
3. Crossover network
4. Squawker

✅ Correct Answer: 4

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

1. Band-pass filter
2. Passive filter
3. All-pass filter
4. Band-stop filter

✅ Correct Answer: 1

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

1. Microphones
2. Loudspeakers
3. Multi-way speakers
4. Blue ray

✅ Correct Answer: 3

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?

1. Volume
2. Video
3. Pitch
4. Frequency

✅ Correct Answer: 1

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

1. Horn type
2. Electrodynamic
3. Cone type
4. Carbon

✅ Correct Answer: 2

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

1. Acoustic
2. Grounding
3. Phase-shifting
4. Power

✅ Correct Answer: 1

What is the efficiency of a horn type loudspeaker?

1. 5 to 10%
2. 75 to 100%
3. 5 to 7%
4. 30 to 50%

✅ Correct Answer: 4

What is the distortion in horn type speaker?

1. 50%
2. 15%
3. 25%
4. Less than 5%

✅ Correct Answer: 4

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

1. 40 dB to 60 dB
2. 4 dB to 6 dB
3. 70 dB to 100 dB
4. 40 dB to 80 dB

✅ Correct Answer: 1

What is the range of a very low impedance microphone?

1. 0 to 50 Ω
2. 50 to 100 Ω
3. 1000 to 1500 Ω
4. 100 to 600 Ω

✅ Correct Answer: 1

What is the range of a high impedance microphone?

1. 50 to 100 Ω
2. 100 to 600 Ω
3. 750 Ω and above
4. 500 to 550 Ω

✅ Correct Answer: 3

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

1. High impedance
2. Low impedance
3. Electromagnetic Induction
4. Medium impedance

✅ Correct Answer: 3

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

1. Pot
2. Ribbon
3. Cardioid
4. Crystal

✅ Correct Answer: 1

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

1. Ribbon
2. Cardioid
3. Crystal
4. Moving coil / dynamic

✅ Correct Answer: 4

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

1. Cardioid
2. Electret
3. Moving coil
4. Ribbon

✅ Correct Answer: 4

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

1. Electret
2. Capacitor
3. Ribbon
4. Moving coil

✅ Correct Answer: 3

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

1. Ribbon
2. Cardioid
3. Moving coil
4. Capacitor

✅ Correct Answer: 2

Which of the following microphone is costlier than other microphones?

1. Moving coil
2. Ribbon
3. Carbon
4. Cardioid

✅ Correct Answer: 2

On which principle is the working of crystal microphone based?

1. High impedance
2. Medium impedance
3. Piezoelectric effect
4. Electromagnetic Induction

✅ Correct Answer: 3

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

1. Ribbon
2. Crystal
3. Moving coil / dynamic
4. Carbon

✅ Correct Answer: 2

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

1. Compressions and rarefactions
2. Compressions
3. Rarefactions
4. Neither compressions nor rarefactions

✅ Correct Answer: 1

Which type of microphone is used for mobile communications?

1. Crystal
2. Capacitor
3. Carbon
4. Electret

✅ Correct Answer: 1

What is the capacitor equation for the capacitance microphone?

1. C = kA / d
2. C = kA + d
3. C = kA – d
4. C = kA * d

✅ Correct Answer: 1

What is the output impedance of capacitor microphone?

1. 25 Ω
2. 0.25 Ω
3. 1 Ω
4. 100 MΩ

✅ Correct Answer: 4

Which type of microphone is used in sound level meter?

1. Electret
2. Capacitor
3. Crystal
4. Carbon

✅ Correct Answer: 2

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

1. Electret
2. Capacitor
3. Carbon
4. Crystal

✅ Correct Answer: 1

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

1. Cardioid
2. Carbon
3. Capacitor
4. Electret

✅ Correct Answer: 4

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

1. Increases
2. Decreases
3. Constant
4. Increases and decreases

✅ Correct Answer: 2

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

1. I = E / R + δr
2. J = E / r + δr
3. J = E / R + δr
4. I = D / R + δr

✅ Correct Answer: 1

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

1. Cardioid
2. Capacitor
3. Electret
4. Carbon

✅ Correct Answer: 4

Which of the following microphones is used only in telephones?

1. Moving coil
2. Ribbon
3. Carbon
4. Electret

✅ Correct Answer: 3

What is the distortion in carbon microphone?

1. 5%
2. 1%
3. 500%
4. 10%

✅ Correct Answer: 4

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

1. Lavalier
2. Noise cancelling
3. Shot-gun type
4. Fiber optical

✅ Correct Answer: 1

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

1. Fiber optical
2. Shot-gun type
3. Noise cancelling
4. Tie-clip

✅ Correct Answer: 4

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

1. Shot-gun type
2. Noise cancelling
3. Fiber optical
4. Radio (wireless)

✅ Correct Answer: 4

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

1. Radio (wireless)
2. Fiber optical
3. Noise cancelling
4. Shot-gun type

✅ Correct Answer: 3

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

1. Shot-gun type
2. Fiber optical
3. Digital interface
4. Lavalier

✅ Correct Answer: 1

On which microphone monitoring on headphone is very much important?

1. Lavalier
2. Digital interface
3. Shot-gun type
4. Fiber optical

✅ Correct Answer: 3

Which microphone provides interference free communication in electrically noisy channel?

1. Fiber optical
2. Shot-gun type
3. Lavalier
4. Digital interface

✅ Correct Answer: 1

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

1. Digital interface
2. Shot-gun type
3. Fiber optical
4. Ribbon

✅ Correct Answer: 3