61601. Which of the following is not correct in respect of electrostatic instrument?
61602. The wave applied to X plates, for ohtaining trace of voltage wave, is
61603. The response of a thermistor overs the whole of its temperatures range is
61604. 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
61605. It is required to study transients during switching process. Which CRO should be preferred?
61606. 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.
61607. If the secondary winding of CT is opened when primary coil is carrying current
61608. 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
61609. Assertion (A): Thermocouple instruments can be used for ac only. Reason (R): Thermocouple instrument has a non linear scale.
61610. 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
61611. Two wattmeter method is suitable only for balanced loads.
61612. 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
61613. A radiation thermometer is suitable for temperatures
61614. 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
61615. 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
61616. 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
61617. Assertion (A): Strain measurement using strain gauge invariably requires a dummy strain gauge.Reason (R): The resistance of strain gauge depends on temperature.
61618. If a shunt of 200 Ω resistance is used with a galvanometer of 1000 Ω resistance, the multiplying power is
61619. A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is
61620. The use of thermocouple meters for ac measurement leads to a scale which is
61621. 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.
61622. The scale of dynamometer wattmeter is non linear.
61623. Magnetic deflection is inversely proportional to
61624. The most commonly used moving iron instruments are
61625. A moving iron instrument can be used for
61626. 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
61627. A 300 V voltmeter has an accuracy of ± 2% of full scale deflection. When the reading is 222 V, the actual voltage
61628. In a thermocouple two metal junctions between metals M1 and M2 are kept at temperature T1 and T2. The thermocouple emf is produced because
61629. The current through a resistance R is shown in figure. The computed value of power is
61630. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
61631. 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
61632. 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
61633. Figure shows a Wheatstone bridge with RTD to one arm. If resistance of RTD = 1020 Ω, the voltage V0 is
61634. 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
61635. If the secondary burden of a CT 15 VA and secondary current is 5 A, the load impedance of CT is
61636. Consider the following instruments Tangent galvanometerRayleigh current balanceHousehold energy meterHot wire ammeter Out of above absolute instruments are
61637. A 0-150 voltmeter has a guaranteed accuracy of 1% of full scale reading. If actual reading is 83 V, the percentage error is
61638. In a CRO, the frequency of output of time base generator
61639. If A = 131 ± 4 and B = 106 ± 4, the percentage range of doubt in A - B is
61640. Two resistance R1 and R2 are connected in series R1 = 528 ± 5 Ω and R2 = 325 ± 3Ω. The total resistance will be
61641. The function of shunt in an ammeter is to
61642. Which of the following does not use the principle of change in inductance?
61643. It is necessary to measure the amplitudes of two signals and also the phase difference between them. This can be done by using a
61644. 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
61645. Wheatstone bridge is suitable for low resistances.
61646. To avoid creep in an energy meter
61647. 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
61648. Four voltmeters have following specifications. If accuracy is main consideration which is the best?
61649. 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
61650. 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