The form factor in AC is the ratio of
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ECE · all questionsMeasurement And Instrumentation
Measurement And Instrumentation
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The error of an instrument is normally given as a percentage of
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The repeat accuracy of an instrument can be judged from its
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The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is
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In a gravity controlled instrument, the deflection angle is proportional
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The problem of Electrostatic coupling in a transformer is acute at
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Which meter is suitable for the measurement of 10mV at 50MHz?
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Which of the following devices should be used for accurate measurement of low D.C. voltage?
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An instrument to be used for measurement and control should preferably have
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Electrostatic instruments are normally used for
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The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100 ohms. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?
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A spring controlled indicating instrument has a deflection of 90° for maximum current I. The corresponding deflection for a gravity controlled instrument is
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PMMC type instruments normally use
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Jewels are used in instruments for the purpose of
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Which instrument has identical calibration for ac as well as dc values?
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The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100 ohms. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?
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If the instrument is to have a wide range, the instrument should have
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It can be stated that
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To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken
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With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be
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