NTA UGC NET/JRF Exam, September-2022 (Electronic Science)

(a) A selective filtering method is most commonly used for generation of SSB signals
(b) A selective filtering method is most commonly used for generation of DSB signals
(c) A VSB modulation is also known as asymmetric side band system
(d) A VSB modulation is also known as symmetric side band system
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(a) Transmission bandwidth should be as small as possible
(b) Transmitted power should be as high as possible
(c) Transmitted bandwidth should be as high as possible
(d) Transmitted power should be as low as possible
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(a) IR Photodiodes cause no risk of contamination or physical damage to the object surface
(b) For higher temperatures, IR photodiode devices have shorter life
(c) IR photodiodes can not be used to measure temperature of moving objects (conveyer bell)
(d) IR photodiodes are capable of measuring hazardous and physically in accessible process
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(a) The Maxwell bridge is suitable for measurement of Medium-Q coils (1 < Q < 10)
(b) For measurements at low frequencies, an oscillator supplies excitation voltage while at higher frequencies, power line may serve as source of excitation
(c) The Hay bridge is convenient for measuring very low Q coils (Q < 1)
(d) The Sehering bridge is particularly useful for the measure of insulating properties i.e., for phase angles nearly 90°
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(a) An optical interferometer is useful for measuring extremely small motions
(b) The damping ratio of a seismic instrument should be low for good dynamic performance
(c) A rate gyro is a relative motion measuring device
(d) A pneumatic motion transducer is nonlinear over a wide range of motion
(e) A piezoelectric accelerometer can only be used for static motion measurement
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