Electrical & Electronics Measurements Objective Questions
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The coil of a moving iron instrument has a resistance of 500 ohm and inductance of 1 H. It reads 250 V when a 250 V DC is applied. It series resistance is 2000 ohms its reading when fed by 250 V, 50 Hz AC will be
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For measuring an AC voltage by an AC potentiometer it is desirable that the supply for the potenmeter is taken from
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Assertion(A): A low power factor wattmeter has special constructional features to ensure accurate measurment. Reason(R): Extension of wattmeter range in DC circuit can be easily done by using current and potential trnasformer
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To increase Q factor of a coil, the wire should be
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For the AC bridge circuit shown in figure at balance the value of Rd
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The trasfer instrument which is used for standartion of a polar type AC potentiometer is
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A thermo couple ammeter gives full scale deflection of 10 A, when it reads one fifth of the scale, the current will be
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Which devices used to measure the temperature of an object ?
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A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of
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Which one of the following units is a fundamental unit?
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In a CRO which of following is not a part of electron gun?
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When a potentiometer is used for measurement of voltage of an unknown source, the power consume in the circuit of the unknown source under null condition is
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Which of the quantity consists of unit as Pascal ?
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Ratio of readings of two wattmeter connected to measure power in a balanced 3-phase load is 5:3 and the load is inductive. The power factor at load is
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Which of following is not correct?
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Which amplifier in used in an electronic multimeter?
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How many times base circuits does a dula frace CRO can have?
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Which of following voltmeters would you use for measuring voltage across 20KΩ resistance
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The circuit in figure is used to measure the power consumed by the load. The current coil and the voltage coil of the wattmeter have 0.02 Ω and 1000 Ω resistance respectively. The measured power compared to the load power will be
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In which of the transformer is the secondary nearly short circuited under normal operating condition?
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Standardisation of potentiometer is done in order that, they become
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Figure show an RC potentiometer to measure AC voltage. It is desire that Vo/Vi should be independent of frequency. The value of C shoud be
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A DC potentiometer is the best means available for the measurement of DC voltage because
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The calibration of a voltmeter can be carried out by using
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Which of the quantity consists of SI unit as Candela?
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A DC potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18 V obtains balances at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf of test cell is
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Magnetic deflection is inversely proportional to
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The use of thermocouple meters for AC measurement leads to scale which is
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A meter has a full-scale deflection of 90° at a current of 1 A. The response of the meter is square law. Assuming spring control, the current for a deflection at 45° will be
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The value of Ld will be
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Take All Tests :
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Electrical & Electronics Measurements Objective Questions – Set 1
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Electrical & Electronics Measurements Objective Questions – Set 2
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Electrical & Electronics Measurements Objective Questions – Set 3
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Electrical & Electronics Measurements Objective Questions – Set 4
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Electrical & Electronics Measurements Objective Questions – Set 5
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Electrical & Electronics Measurements Objective Questions – Set 6