288.  If a kinescope recording is made on a negative film, the video polarity on the kinescope is
A. positive
B. negative
C. either positive or negative
D. none of these

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289. For low-band monochrome video tape recording operation, the frequency that corresponds to blanking is
A. 5 MHz
B. 6.8 MHz
C. 4.3 MHz
D. 7 MHz

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290. For low-band monochrome video tape recording operation, the frequency that corresponds to sync tips is
A. 6.8 MHz
B. 5 MHz
C. 4.3 MHz
D. none of these

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291.  A typical magnetic tape-recorder has a recording head gap size of 1 mil. If the tape moves across the gap at a speed 15inches/sec. theextinction frequency is
A. 15 kHz
B. 150 kHz
C. 5 kHz
D. none of these

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292. A cassette with an inscription C-60 implies that
A. total recording period is 60 minutes
B. total tape length is 60 ft
C. tape moves at a speed of 60 mm/sec
D. none of these

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293. Video signals have a frequency range that is spread over approximately
A. 9 octaves
B. 18 octaves
C. 4 octaves
D. 18 decades

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294. In a pyroelectric target, the charge developed as a result of radiations falling on its surfacedepends upon
A. the intensity of radiations
B. the frequency of radiations
C. the temperature difference caused by difference in radiation's intensity variations
D. none of these

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