316. FM detector employed in the sound section of a television receiver is generally
A. a frequency discriminator (Foster-Seeley type)
B. a ratio detector
C. eitherof the two
D. none of these

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317. Switching of channel-selector switch from one channel to another
A. alters the resonant frequency of tuned circuits of local oscillator
B. alters the resonant frequency of tuned circuits of RF and IF stages
C. alters the resonant frequency of tuned circuits of RF, IF and local oscillator stages
D. alters the resonant frequency of tuned circuits of RF, mixer and local oscillator stages

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318.  Which of the following statements is wrong?
A. picture carrier is less than sound carrier
B. video frequencies upto 5 Mhz are allowed in CCIR standards
C. lower video frequencies represent background information
D. picture IF is less than sound IF

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319.  The phenomenon of making different electron beams fall on the centres of respective dots on colour TV picture-tube screen is termed as
A. colour convergence
B. degaussing
C. colour purity
D. none of these

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320. The process by which electron beams are made to strike the centres of the respective phosphor dots of the same picture-element is termed as
A. colour convergence
B. degaussing
C. colour purity
D. none of these

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321.  Automatic colour-level control is a
A. variable coil
B. variable capacitance
C. variable resistance
D. present capacitance

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322. Automatic tint-control is a
A. variable resistance
B. variableinductance
C. variable capacitance
D. none of these

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