Surprise Quiz - II

The modulation index of FM is given by β =_______.

• fm /fc

• fm /Δf

• Δf /fm

• fc /fm

The amount of frequency deviation in FM signal depends on _________.

• Carrier frequency

• Modulating frequency

• Transmitter amplifier

• Amplitude of the modulating signal

What is the modulation index in an FM signal when the modulating frequency is 250Hz and maximum frequency deviation is 5KHz?

• 10

• 20

• 35

• 75

Outline the basic difference between NBFM and AM signal.

• Bandwidth

• Number of Side bands

• Frequency Deviation

• Algebraic sign reversal for the lower side frequency

Armstrong modulator generates FM using ______.

• Direct method

• Indirect method

• Varactor diode

• Reactance FET

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

• 100 KHz

• 75KHz

• 15KHz

• 120KHz

Identify the standard intermediate frequency used in super heterodyne FM receiver.

• 10.7 MHz

• 455 KHz

• 50 MHz

• 580 KHz

Amplitude limiting action is inherent in ______________detector.

• Ratio

• Foster-Seeley

• Single Slope

• Balance Slope

The transmitted power in an FM system is ______.

• dependent on the number of sidebands

• dependent on the carrier power and sidebands

• always varies with time

• always constant

What is the required bandwidth according to Carson's rule, when a 100 MHz carrier is modulated with a sinusoidal signal of 1KHz, the maximum frequency deviation being 50 KHz?

• 50KHz

• 100KHz

• 102 KHz

• 150KHz