74901. The use of thermocouple meters for ac measurement leads to a scale which is
74902. Assertion (A): A low power factor wattmeter has special constructional features to ensure accurate measurement.Reason (R): Extension of wattmeter range in dc circuit can be easily done by using current and potential transformer.
74903. The scale of dynamometer wattmeter is non linear.
74904. Magnetic deflection is inversely proportional to
74905. The most commonly used moving iron instruments are
74906. A moving iron instrument can be used for
74907. Two voltmeters are each 0-300 V range. Their internal resistances are 10 kΩ and 20 kΩ They are connected is series and a voltage of 400 V is applied. Their readings respectively will be
74908. A 300 V voltmeter has an accuracy of ± 2% of full scale deflection. When the reading is 222 V, the actual voltage
74909. In a thermocouple two metal junctions between metals M1 and M2 are kept at temperature T1 and T2. The thermocouple emf is produced because
74910. The current through a resistance R is shown in figure. The computed value of power is
74911. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
74912. What would be the reading of voltmeter as shown in below figure. The voltmeter has a 0-1 V scale and is a 20000 Ω/V meter
74913. A temperature sensistive transducer is subjected to sudden temperature change. It takes 10 seconds for transducer to reach equilibrium condition (five times time constant). The time taken to reach half of temperature difference will be
74914. Figure shows a Wheatstone bridge with RTD to one arm. If resistance of RTD = 1020 Ω, the voltage V0 is
74915. The current passing through a resistance of 100 ± 0.2% Ω is 2 ± 0.5% A. The limiting error in computation of power will be
74916. If the secondary burden of a CT 15 VA and secondary current is 5 A, the load impedance of CT is
74917. Consider the following instruments Tangent galvanometerRayleigh current balanceHousehold energy meterHot wire ammeter Out of above absolute instruments are
74918. A 0-150 voltmeter has a guaranteed accuracy of 1% of full scale reading. If actual reading is 83 V, the percentage error is
74919. In a CRO, the frequency of output of time base generator
74920. If A = 131 ± 4 and B = 106 ± 4, the percentage range of doubt in A - B is
74921. Two resistance R1 and R2 are connected in series R1 = 528 ± 5 Ω and R2 = 325 ± 3Ω. The total resistance will be
74922. The function of shunt in an ammeter is to
74923. Which of the following does not use the principle of change in inductance?
74924. It is necessary to measure the amplitudes of two signals and also the phase difference between them. This can be done by using a
74925. A sinusoidal signal is measured by CRO. The scale is set at 4 mV/cm. If vertical distance between positive and negative peaks is 6 cm, the peak value of ac signal is
74926. Wheatstone bridge is suitable for low resistances.
74927. To avoid creep in an energy meter
74928. A wire strain gauge has a gauge factor of 2, resistance of 125 Ω and length 1 m. If length of wire changes by .005 m, change in resistance will be
74929. Four voltmeters have following specifications. If accuracy is main consideration which is the best?
74930. The deflection of a DArsonval galvanometer is measured through a mirror and scale. The mirror is 1 m away from the light source. The mirror is mounted on, the moving system. If mirror rotates through 0.2 rad the displacement on the scale is
74931. Two ammeters having resistances of 0.5 Ω and 0.25 Ω and having full scale reading of 25 A each are connected in parallel. To ensure that neither of them goes beyond scale, the total current should not be more than
74932. A polyphase wattmeter basically consists of two wattmeters. The moving system of two wattmeters
74933. The dead zone in a pyrometer is 0.125% of span. The calibration is 400°C to 1000°C. What temperature change might occur before it is detected.
74934. The dimensions of force are
74935. An amplifier has to amplify pulses of 1 H-s duration. The minimum bandwidth of amplifier must be
74936. A moving coil meter has a resistance of 50 ohms and a full scale deflection current of 20 mA. To convert it into a voltmeter of 0-100 V range, the series resistance should be
74937. In measuring a resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeters should be connected
74938. Which of the following methods can be used to measure power in a single phase circuit without using wattmeter? One voltmeter, one ammeterTwo voltmeters, two ammeterThree voltmetersThree ammeters
74939. For measurement of surface temperature of solids the elements of RTD is usually in the shape of
74940. As per BIS, the number of accuracy classes of instrument is
74941. In most of instruments, the controlling torque is provided by
74942. A 0-200 V voltmeter has a sensitivity of 1 kΩ per volt. The resistance of voltmeter is
74943. DC ampere hour meter is an indicating instrument.
74944. The accuracy of measurement by ohmmeter is very good.
74945. Hay's bridge is suitable for inductances having low L/R ratio.
74946. Moving iron instrument can be used for ac only.
74947. In electronic voltmeters the measuring device is a
74948. An ammeter has a resistance of 50 ohms and a shunt of 0.01 Ω. The deflection is θ. If the shunt resistance is increased to 0.02 Ω, the deflection will be.
74949. The ac bridge in figure is balanced. Z1 = 100∠30°, Z2 = 150∠0°, Z3 = 250∠ - 40° Then Z4 =
74950. Assertion (A): If the resistance of shunt of an ammeter is increased, the range of ammeter is reduced.Reason (R): If the series resistance of a voltmeter is increased, the range of voltmeter is increased.
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