Measurement and Instrumentation A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of Contact resistance. Resistance of connecting leads. Thermoelectric emfs. All of above. Contact resistance. Resistance of connecting leads. Thermoelectric emfs. All of above. ANSWER DOWNLOAD EXAMIANS APP
Measurement and Instrumentation The resistance of a circuit is found by measuring current flowing and the power fed into the circuit. If the limiting errors in the measurement of power and current are ± 1.5% and ± 1.0% respectively, the limiting error in the measurement of resistance ± 1% ± 1.5% ± 2.5% ± 3.5% ± 1% ± 1.5% ± 2.5% ± 3.5% ANSWER DOWNLOAD EXAMIANS APP
Measurement and Instrumentation A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is 120° 0° 30° 90° 120° 0° 30° 90° ANSWER DOWNLOAD EXAMIANS APP
Measurement and Instrumentation For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging One of the wattmeter connections will have to be reversed One of the wattmeters will read zero Pressure coil of the wattmeter will become ineffective. Both give the same readings One of the wattmeter connections will have to be reversed One of the wattmeters will read zero Pressure coil of the wattmeter will become ineffective. Both give the same readings ANSWER DOWNLOAD EXAMIANS APP
Measurement and Instrumentation The main advantage of Anderson bridge over Maxwell bridge is that reduction of the cost. measures high Q inductors. attaining balance condition is easier. balance equation independent of frequency. reduction of the cost. measures high Q inductors. attaining balance condition is easier. balance equation independent of frequency. ANSWER DOWNLOAD EXAMIANS APP
Measurement and Instrumentation The limiting errors of measurement of power consumed by and the current passing through a resistance are ±1.5% and ±1% respectively. What is the limiting error ( in %) of measurement of resistance ? ± 1.5% ± 1% ±3.5% ± 2.5% ± 1.5% ± 1% ±3.5% ± 2.5% ANSWER DOWNLOAD EXAMIANS APP
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