laboursonline – MCQs, Mock Tests | Electrical engineering Audio Video Engineering MCQs set -4

Which of the following microphone have an integrated circuit (IC) that replaces the JFET in a conventional in an electret condenser microphone resulting in a fully digital output of the electret microphone?

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

✅ Correct Answer: 4

Which of the following is also called reverse transducer?

1. Loudspeaker
2. Microphone
3. Baffle
4. Compact disk

✅ Correct Answer: 1

What is expressed as the ratio of output sound power to the input audio (electrical power) in loudspeaker?

1. Efficiency
2. Frequency response
3. Noise
4. Distortion

✅ Correct Answer: 1

What is expressed as the ratio of ‘signal output’ to the ‘output in the absence of signal’?

1. Distortion
2. Signal to noise ratio (S/N)
3. Directivity
4. Impedance

✅ Correct Answer: 2

What is the unit for directivity in loudspeaker?

1. Hz
2. KHz
3. Decibel
4. Newton

✅ Correct Answer: 3

On which principle is the moving-coil loudspeaker based?

1. Electromagnetic transduction
2. Electromagnetic induction
3. Piezoelectric effect
4. Electro dynamic induction

✅ Correct Answer: 1

What is the equation for the force in newton on the coil due to interaction between current through the coil and magnitude field?

1. F = Bli sin α
2. F = Bli tan α
3. F = Bli cos α
4. F = Bl sin α

✅ Correct Answer: 1

Which magnetic material is the magnet in the moving coil loudspeaker made up of?

1. AlNiCo
2. BrNiCo
3. XeNiCo
4. PNiCo

✅ Correct Answer: 1

What is attached to the coil of moving coil loudspeaker and it causes compression and rarefaction cycles in air?

1. Paper cone
2. Electrodynamic
3. Horn
4. Ribbon

✅ Correct Answer: 1

What is the power handling capacity for cone type speaker?

1. Up to 25 watts
2. Up to 250 watts
3. Up to 235 watts
4. Up to 75 watts

✅ Correct Answer: 1

Which is the ideal medium for editing like cut, copy and paste in disk based recording?

1. Blu-ray
2. Variable method
3. Audio compression
4. Magnetic disk drive

✅ Correct Answer: 4

What type of coding is used for weakness of human ears in audio compression?

1. Static
2. Dynamic
3. Perpetual
4. Disk based

✅ Correct Answer: 3

In which type of applications can hard disk based drives are useful?

1. Electronic news gathering
2. Timing errors
3. Low cost
4. High data stream

✅ Correct Answer: 1

Which audio storage device is faster in retrieving audio in disk based recording?

1. USB flash drive
2. Magnetic tape
3. Solid state drive
4. Blu-ray disk

✅ Correct Answer: 2

What is known as each digit in binary?

1. Bit
2. Byte
3. ADC
4. Mega

✅ Correct Answer: 1

Which information is compared with the threshold level in a binary system?

1. Digital
2. Video
3. Audio
4. Binary

✅ Correct Answer: 4

What is the main advantage of binary signal?

1. We can store large data
2. We can store less data
3. We cannot store data
4. High gain

✅ Correct Answer: 1

A combination of how many bits in a binary number is commonly called a word?

1. 32
2. 64
3. 16
4. 8

✅ Correct Answer: 3

Which bit is used for signed numbers in binary signal?

1. MSB
2. LSB
3. PCM
4. ACD

✅ Correct Answer: 1

What is equal to 1024 bytes?

1. 10K
2. 3K
3. 5K
4. 1K

✅ Correct Answer: 4

In which audio systems, the sound is first converted into analog electrical signals using a microphone as a transducer?

1. Digital
2. Analog
3. Binary
4. Passive

✅ Correct Answer: 1

What numbers is digital information made of?

1. Discrete
2. Continuous
3. Binary
4. Prime

✅ Correct Answer: 1

What type of errors can be eliminated for stereo images in digital systems?

1. Gross
2. Limiting
3. Timing
4. Random

✅ Correct Answer: 3

Which of the following restrictions apply to analog broadcasting?

1. Disc based recording
2. Channel coding
3. Networks
4. Interference, fading and multipath reception

✅ Correct Answer: 4

Over how much distance can we transmit digital audio without loss of quality?

1. Zero
2. Infinite
3. 1
4. Thousands

✅ Correct Answer: 2

Which is the important part of the system which are being used to time shift broadcast programs to skip commercial breaks?

1. Hard drive based servers
2. Software drive based servers
3. Disk based recording
4. Digital audio broadcasting

✅ Correct Answer: 1

Which type of audio video files can be made portable by downloading?

1. Uncompressed
2. Compressed
3. Noisy
4. Distorted

✅ Correct Answer: 2

Which of the following cannot be detected and therefore it is difficult to separate the original signal from distorted signal in audio signal?

1. Bandwidth
2. Amplitude
3. Distortion
4. Wavelength

✅ Correct Answer: 3

What is the full form of PCM?

1. Pulse code modulation
2. Phase code modulation
3. Pulse carrier motion
4. Pulse carrier modulation

✅ Correct Answer: 1

In which manner each sample is represented in audio signal?

1. Back porch
2. AGC (Automatic gain control)
3. Root mean square
4. Stepwise

✅ Correct Answer: 4

What is expressed as the magnitude of sample represented by finite number which is proportional to some voltage in audio signal?

1. Quantizing
2. Amplitude
3. Phase
4. Frequency

✅ Correct Answer: 1

At which time step is a sample taken in ADC?

1. Odd
2. Even
3. Prime
4. 1

✅ Correct Answer: 2

What is the other name for black and white TV?

1. Monochrome TV
2. Color TV
3. QLED
4. Plasma

✅ Correct Answer: 1

Which generator produces sets of pulses to operate the system at appropriate timings?

1. Induction
2. Signal
3. Synchronizing
4. Electrical

✅ Correct Answer: 3

Which carrier frequency is used in audio modulation in an FM transmitter for the purpose of audio signal transmission?

1. 10.5 MHz
2. 5.5 MHz
3. 7.5 MHz
4. 2.4 MHz

✅ Correct Answer: 2

Which antenna is preferred for aerial TV receiver in monochrome TV receiver?

1. Loop
2. Dipole
3. Yagi-Uda
4. Helix

✅ Correct Answer: 3

Which power supply is used in the monochrome TV receiver?

1. Linear
2. Switched
3. SMPS
4. Battery based

✅ Correct Answer: 3

Which three colors are used in color TV transmitter?

1. Red, green, blue
2. Orange, blue, green
3. Black, green, purple
4. Red, yellow, pink

✅ Correct Answer: 1

What is the full form of VSB?

1. Vestigial synchronous band
2. Vestigial side band
3. Vertical side band
4. Vestigial synchronous base

✅ Correct Answer: 2

How many times more pixels do an HDTV have than the resolution of analog signal in a DTV?

1. 6
2. 2
3. 10
4. 4

✅ Correct Answer: 1

Which digital signal processing technique takes preventive measures to protect the transport streams from errors caused by noise and interference in the transmission channel in DTV transmitter and receiver?

1. FEC (Forward Error Correction)
2. AGC (Automatic Gain Control)
3. VDU (Visual Display Unit)
4. RFID (Radio Frequency Identification)

✅ Correct Answer: 1

What is the other name for video monitor?

1. SSD
2. CCU
3. VSU
4. VDU

✅ Correct Answer: 4

Which sync signals ensure that the scanning action of the electron beam down and across the screen is in synchronization in video monitors?

1. Horizontal
2. Left and right
3. Vertical
4. Horizontal and vertical

✅ Correct Answer: 4

What is termed as the process of exploring a video picture image in quick succession?

1. Picture frame
2. Skimming
3. Flicker
4. Scanning

✅ Correct Answer: 4

Which signals are applied to the horizontal and vertical deflection circuits of the camera tube in scanning?

1. Analog
2. Unit impulse
3. Sawtooth
4. Ramp

✅ Correct Answer: 3

What is the word used by TV engineers for one complete scanning from left to right and top to bottom and then again to the top?

1. Picture frame
2. Picture image
3. Picture video
4. Picture audio

✅ Correct Answer: 1

How many scanning lines per frame are there for Indian PAL system?

1. 255
2. 365
3. 760
4. 625

✅ Correct Answer: 4

What happens to the image if the space between pictures is longer than the period of persistence of vision?

1. Skimming
2. Flickers
3. Scanning
4. Interlaced scanning

✅ Correct Answer: 2

What is the field rate for PAL system?

1. 15 Hz
2. 75 Hz
3. 2 Hz
4. 50 Hz

✅ Correct Answer: 4

What is the term for even and odd fields that are scanned alternately?

1. Interlaced scanning
2. Skimming
3. Scanning
4. Flicker

✅ Correct Answer: 1