Divya

Loudspeaker is ............................

• transducer

• transmitter

• radio emitter

• radio transmitter

Transducer converts .......................................

• electrical signal of audio frequency into sound waves of same frequency

• mechanical to electrical

• sound waves signal to electrical audio signal

• electrical to mechanical

SNR is ....................

• signal o/p to o/p of noise in absence of signal

• o/p signal to i/p noise signal

• o/p sound signal frequency to i/p sound signal frequency

• o/p frequency to i/p frequency

Frequency response of loudspeaker is ...............................

• ±30dB for range of 20kHz to 30kHz

• ± 1dB for range of frequency 16kHz to 20kHz

• ± 1dB for range of 16kHz to 20kHz

• ± 20dB for range of 10kHz to 15kHz

Mention the dynamic loudspeaker frequency response better than .................

• 20Hz TO 40Hz

• 40Hz to 5000Hz

• 40Hz to 5500Hz

• 20Hz to 40Hz

Force on coil is formulated as ....................

• F=B sin α i

• F= tan α li

• F= Bli sin α

• F= sin α

Which type of crystal is used in microphone......................

• Rochelle salt

• Rochelle and quartz

• quartz

• Sodium

What is the frequency allocated for communication on worksites

• 174.6 and 175.95MHz

• 174.6 and 174.95 MHz

• 173.6 and 173.64 MHz

• 17.1 and 18.65MHz

The narrow bandwidth specification for wireless microphone is .............................

• +75kHz

• +20kHz

• +50kHz

• 15kHz

The o/p power of transmitter must not exceed ................... for narrow and ...................... for wide band .

• 10mW and 50mW

• 20W and 25W

• 50mW and 10mW

• 50W and 10W