COMMUNICATION

What is the range of frequency for standard amplitude modulation broadcast?

• A)500 TO 1500 kHz

• (B)535 to 1605 kHz

• (C)450 to 1600 kHz

• (D)550 to 1605kHz

For telegraphy the most commonly used modulation systemis

• A) FSKB

• (B) two tone modulation

• (C) PCM

• (D) single tone modulation

The maximum power efficiency of an AM modulator is

• (A) 25%

• (B) 33%

• (C) 50%

• (D) 100%

Any device that converts one form of energy into another is called:

• (A)Rectifier

• (B)Amplifier

• (C)Transducer

• (D)None of these

The modulation index of FM is given by:

• (A). μ = frequency deviation/ modulating frequency

• (B). μ = modulating frequency /frequency deviation

• (C). μ = modulating frequency/ carrier frequency

• (D). μ = carrier frequency / modulating frequency

The range of modulating frequency for Narrow Band FM is

• (A)30 Hz to 15 KHz

• (B)30 Hz to 30 KHz

• (C)30 Hz to 3 KHz

• (D)3 KHz to 30 KHz

What is the maximum frequency deviation allowed in commercial FM broadcasting?

• (A). 100 KHz

• (B) 75 KHz

• (C)15 KHz

• (D) 120 KHz

Which of the following is the primary function of a transmitter in a communication system?

• (A) To convert the message into electrical signals

• (B) To encode the message

• (C) To amplify the message signal

• (D) To convert the message into sound waves

Which of the following modulation techniques is used in TV broadcasting?

• (A) Amplitude Modulation AM

• (B) Frequency Modulation (FM)

• (C) Phase Modulation PM

• (D) Digital Modulation

Which device is typically used to demodulate Frequency Modulation (FM) signals?

• (A) Mixer

• (B) Demodulator

• (C) PLL (Phase-Locked Loop)

• (D) Antenna