NTA UGC NET/JRF Exam, June -2021 (Electronic Science)

(a) If the intermediate frequency is too high, poor selectivity results even if sharp cutoff filters are used in the IF stage.
(b) A high value of intermediate frequency increases tracking difficulties.
(c) As the intermediate frequency is lowered, image frequency rejection becomes better.
(d) A very low intermediate frequency can make the selectivity too sharp.
Choose the correct answer from the options given below:

(a) a two electrode, bidirectional avalanche diode.
(b) a device which conducts below the breakover voltage.
(c) a unidirectional resistive device.
(d) designed to supply large gate current.
(e) used to supply the voltage to the motors.
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(a) For dynamic measurements using resistance strain gauges, temperature compensation is not necessary.
(b) Eddy current type of transducer gives an output proportional to velocity.
(c) A variable capacitance type transducer gives an output proportional to acceleration.
(d) A piezoelectric transducer cannot be used to measure static variables. Choose the correct answer from the options given below:

(a) Ultrasonic method for liquid level measurement is not preferred in industrial applications.
(b) In a pH meter, the glass electrode is the reference electrode.
(c) A chromatograph is used for analysing the composition of a gas.
(d) The production of Korotkoff sounds in indirect blood pressure measurement is due to pressure pulses produced due to the difference in systolic and diastolic blood pressure.
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