Q301
Open questionA 500 mA voltmeter is specified to be accurate with ±2%. Then, what is the limiting error when instrument is used to measure 300 mA?
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ECE · all questionsMeasurement And Instrumentation
Measurement And Instrumentation
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Q302
Open questionWith the signal generator frequency of a Q meter set to 1.25 MHz, the Q of a coil is measured as 98 when Capacitance C = 147 pF. Then the coil inductance and resistance would be
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Q303
Open questionWhich one of the following meters has maximum loading effect on the circuit under measurement?
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Q304
Open questionWhich is not an active transducer
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Q305
Open questionThe current flowing through the resistor R is as indicated in the given figure. The computed value of power is
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Q306
Open questionA special voltmeter can be devised which can measure the amplitude of a signal at two points in a circuit and simultaneously measure the phase difference between the voltage waveforms at these two points. Such a meter would be a
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Q307
Open questionA heater element is made of nichrome wire having resistivity equal to 100 × 10-8 Ωm and diameter of 0.4 mm. The length of the wire required to get a resistance of 40 Ω will be nearly
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Q308
Open questionThe primary current in a current transformer is dedicated by
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Q309
Open questionThe power factor meter has
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Q310
Open questionWhich one of the following is the correct statement?
Active probe used in a CRO
Active probe used in a CRO
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Q311
Open questionWhat are the advantages of resistance potentiometer?
1. They are inexpensive.
2. They are useful for measurement of large amplitudes of displacement.
3. Their electrical efficiency is very high and they provide sufficient output to permit control operations without further amplification.
1. They are inexpensive.
2. They are useful for measurement of large amplitudes of displacement.
3. Their electrical efficiency is very high and they provide sufficient output to permit control operations without further amplification.
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Q312
Open questionA DVM has a digit display. The 1 volt range can read upto
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Q313
Open questionInduction type single phase energy meters measure electric energy in
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Q314
Open questionThe lissajous pattern appearing on the screen of a CRT, when two sinusoidal voltages of equal frequencies, which are in phase with each other are applied to the CRO is
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Q315
Open questionWhich one of the following types of landline telemetry method has the advantage of simplicity and is free from noise, leakage and supply voltage variations?
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Q316
Open questionWhen the voltage across a battery is measured using a D.C. potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, the voltmeter reading shows 0.99 V. If the resistance of the voltmeter is 1100 Ω, the internal resistance of the battery, in Ω, is
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Q317
Open questionA 0-25 A ammeter has a guaranteed accuracy of 1% of full scale reading. The current measured by this instrument is 10 A. The limiting error in % is,
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Q318
Open questionSemiconductor strain gauges are usually made of
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Q319
Open questionWhich one of the following statements is not correct?
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Q320
Open questionA capacitance transducer uses two quartz diaphragms of area 750 mm2 separated by a distance 3.5 mm. The capacitance is 370 pF. When a pressure of 900 kN/m2 is applied, the deflection is 0.6 mm. The capacitance at this pressure would be:
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