74851. A volt ratio box should have low resistance.
74852. A Hall effect transducer has KH = - 1 x 10-8. If B = 1 Wb/m2, I = 3 A and bismuth slab is 2 mm wide, the Hall voltage is
74853. Two ammeters A and B both 0-10 A have internal resistance of 1 Ω and 0.5 Ω respectively. They are connected in parallel. If total current is 15 A, then
74854. A 3-ohm resistor is connected is parallel to 6-ohm resistor.The combination is connected in series to an 8-ohm resistor.A 10-ohm resistor is connected in parallel to the whole combination.The effective resistance is:
74855. The loss of charge method can be used to measure
74856. Assertion (A): Maxwell bridge is for measuring inductance of medium magnitude.Reason (R): In Maxwell's bridge the unknown inductance is measured by comparing it with a capacitance.
74857. Assertion (A): A semiconductor strain gauge is more accurate than a resistance strain gauge.Reason (R): The gauge factor of a semiconductor strain gauge is about 100 where as the gauge factor of a resistance strain gauge is only about 2.
74858. Current density has the dimensions
74859. The resistance of a dc galvanometer is 20 Ω. A current of 10 mA causes full scale deflection. To convert it into 0-300 V voltmeter, we have to use a series resistance of
74860. A capacitance transducer can be used to measure
74861. The dynamometer principle can be used for
74862. Assertion (A): In hot wire instrument the material of hot wire in generally platinum iridium.Reason (R): A hot wire ammeter is suitable for ac only
74863. The scale of hot wire ammeter is
74864. A moving coil meter has a shunt of 0.02 Ω resistance. If coil resistance is 1000 Ω and a potential difference of 500 mV is required across it to cause full scale deflection, the current through shunt is
74865. Consider the following features of an instrument suitable for both ac and dcfree from hysteresis and eddy current errorsNo waveform and frequency errorsit is essentially a voltmeter This instrument is
74866. Which one of the following effects is used in measuring power?
74867. The effect of lead resistance is important in measurement of
74868. A high resistance was measured by loss of charge method. The voltmeter resistance was 1010 ohms. The calculation gave the value of unknown resistance as 0.8 x 109 ohms. The true value of resistance is
74869. A resistance wire strain gauge has gauge factor 2. If stress is 100 mega newton/m2 and Young's modulus is 200 giga newton/ m2, the percentage change in gauge resistance due to stress is
74870. Insertion of a dielectric material between the plates of an air capacitor
74871. Two ammeters A and B are connected in parallel in a circuit carrying 100 A. Their resistances are 0.8 mΩ. Their readings will be.
74872. In figure, Za = 100∠50°, Zb = 300∠-90° and Zc = 200∠0°. For balanced condition, Zd will be
74873. In household energy meters the flux of series magnet is in phase with current but the flux of shunt magnet lags the voltage by 88°. The reading of energy meters
74874. Assertion (A): A universal RLC bridge has a battery and also a high frequency ac source.Reason (R): RLC bridge uses a Wienbridge arrangement for measuring capacitance.
74875. The emf of a Weston cell is 1.286 V.
74876. The power factor of a single phase load can be calculated if instruments available are
74877. A variable reluctance type tachometer has 150 teeth on rotor. The counter records 13500 pulse/sec. The rotational speed is
74878. The current through the coil of an electromagnet is doubled. The magnetic field around the coil
74879. In a moving iron voltmeter the coil has a resistance of 20 Ω and an inductance of 0.3 H. The swamping resistance in 2000 Ω. To ensure correct reading with dc as well as 50 Hz ac, the value of capacitor to be connected in parallel with swamping resistance should be
74880. Two resistances R1 = 18.7 Ω. and R2 = 3.624 Ω in series. The total resistance to the appropriate number of significant figures is
74881. The input impedance of CRO is about
74882. Which of the following is not correct in respect of electrostatic instrument?
74883. The wave applied to X plates, for ohtaining trace of voltage wave, is
74884. The response of a thermistor overs the whole of its temperatures range is
74885. A resistance is measured by voltmeter-ammeter method. The voltmeter is 0-250V, ± 1% accuracy and ammeter is 0-5 A, ± 1 % accuracy. The readings of voltmeter and ammeter are 100 V and 2 A respectively. The error in the measured resistance can be
74886. It is required to study transients during switching process. Which CRO should be preferred?
74887. Assertion (A): In loss of charge method, it is preferable to use an electronic voltmeter.Reason (R): The resistance of electronic voltmeter is very high.
74888. If the secondary winding of CT is opened when primary coil is carrying current
74889. The percentage limiting error in an instrument reading 8.3 V and having guaranteed accuracy of 1% of the full scale reading and range of 0-150 V is
74890. Assertion (A): Thermocouple instruments can be used for ac only. Reason (R): Thermocouple instrument has a non linear scale.
74891. A meter has a resistance of 1 Ω and full scale deflection current of 1 mA. To convert into an ammeter of 1 A range, the shunt resistance should be
74892. Two wattmeter method is suitable only for balanced loads.
74893. A rectifier voltmeter using bridge rectifier and PMMC meter is calibrated to read rms value of sine wave. A triangular wave is applied to it and it reads 6.82 V. The rms value of triangular wave is
74894. A radiation thermometer is suitable for temperatures
74895. Consider the following statements Thermistor is more sensitive than platinum resistance thermometerThe resistance of thermistor is solely a function of its absolute temperature whether the source of heat is external or internalThermistor has linear temperature-resistance relationshipThermistor has linear negative temperature coefficient Of the Statements, the correct statements are
74896. A moving coil meter has 10 Ω resistance and requires 40 mA for full scale deflection. The shunt resistance required to convert it into 0-2 A ammeter is
74897. Which of the following instruments can be used for dc as well ac upto a few MHz? Moving iron instrumentThermocouple instrumentInduction instrumentMoving coil instrument Select the correct answer as per following codes
74898. Assertion (A): Strain measurement using strain gauge invariably requires a dummy strain gauge.Reason (R): The resistance of strain gauge depends on temperature.
74899. If a shunt of 200 Ω resistance is used with a galvanometer of 1000 Ω resistance, the multiplying power is
74900. A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is
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