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In Modulation, “carrier” is
D. voltage for which frequency, phase or amplitude is varied
D. voltage for which frequency, phase or amplitude is varied
See lessWhich of the following statements is correct?
A. convex lens has positive focal power and concave lens have negative focal power
A. convex lens has positive focal power and concave lens have negative focal power
See lessIn Pulse Code Modulation system
A. large bandwidth is required
A. large bandwidth is required
See lessThe colour of an object is decided by
C. reflected colour for opaque object and wavelength transmitted through it for transparent objects
C. reflected colour for opaque object and wavelength transmitted through it for
See lesstransparent objects
Commercial Frequency deviation of FM is
B. 75 khz
B. 75 khz
See lessFor telegraphy the most commonly used modulation system is
A. fsk
A. fsk
See lessAn FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.
B. 113
B. 113
See lessCircular polarization
A. is useful in reducing depolarization effect on received wave
A. is useful in reducing depolarization effect on received wave
See lessWhen the length of antenna is a whole wavelength
A. the radiation at right angles is zero
A. the radiation at right angles is zero
See lessWhich of the following is an indirect way of generating FM?
A. armstrong modulator
A. armstrong modulator
See less