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Sufficient heating of the heater is ensured by ________(a) increasing the temperature(b) making use of induction coil(c) amplifying d.c. input(d) amplifying a.c. inputThis question was posed to me in an international level competition.I need to ask this question from True RMS Responding Voltmeter topic in portion Electronic Instruments of Electrical Measurements |
Answer» RIGHT choice is (d) amplifying a.c. input The EXPLANATION is: Maximum heating of the heater is OBTAINED by MAKING use of an amplified a.c. input. As a result the thermocouple generates maximum VOLTAGE level in order to cause the meter deflection. |
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