61751. In a megger the controlling torque is provided by
61752. A 3-digit voltmeter having a resolution of 100 mV can be used to measure a maximum of
61753. For measurement of high voltage capacitors the suitable bridge is
61754. To avoid the effect of stray magnetic fields in ac bridge we can use
61755. A resistance strain gauge is usually
61756. If n measurements of a quantity are made, the arithmetic mean is
61757. Assertion (A): Secondary instruments require calibration at frequent intervals.Reason (R): Secondary instruments have many errors.
61758. In ac bridge measurements, 'Wagner ground' means
61759. The range of RTD using platinum is about
61760. A digital voltmeter has a 4 1/2 digit display. The 1 V range can measure voltage up to
61761. Consider the following statements as regards induction and dynamometer wattmeters Dynamometer wattmeters can be used for dc only.Induction wattmeter has higher torque and dynamometer wattmeter.Induction wattmeter is less accurate, has more power consumption and more weight than dynamometer wattmeter. Which of the above statements are correct?
61762. A Maxwell's bridge has the unknown inductance in one arm and resistance in the other three arms.
61763. For a current transformer, the standard secondary rating is
61764. Assertion (A): When frequencies of signals fed to X and Y plates of CRO are multiples of each other, Lissajous pattern is displayed on screen.Reason (R): In a CRO, the vertical deflection is proportional to voltage applied to Y plates.
61765. In portable instruments, damping is provided by
61766. The sensitivity of electromagnetic digital flow meter can be increased by increasing
61767. The increase in intensity of trace in a CRO causes a change in
61768. A diode peak reading VTVM and thermocouple meter are connected across output of an amplitude modulated circuit. In the absence of modulation both meters read 10 V. When sinusoidal AM is applied, VTVM reads 15V The reading of thermocouple meter will be
61769. A single phase energy meter operates on induction principle.
61770. The accuracy of measurement using CRO is about
61771. The channel required for FM telemetry is
61772. Assertion (A): Absolute instruments are used in standard laboratories.Reason (R): Absolute instruments do not require calibration.
61773. Assertion (A): A 3 phase wattmeter consists of two wattmeters mounted in one case.Reason (R): Power measurement in a 3 phase circuit can be conveniently done by two wattmeter method.
61774. A digital voltmeter can count from 0 to 9999. If full scale reading is 9.999 V, the resolution of full scale reading is
61775. The most serious problems in ac bridge measurement is
61776. Assertion (A): An electrostatic voltmeter is free from hysteresis and eddy current errors.Reason (R): An electrostatic voltmeter has a number of fixed and moving vanes in parallel.
61777. The pointer of an indicating instrument should be
61778. The resistance of resistance strain gauge is about
61779. Which bridge can be used to measure frequency?
61780. The time base generator in a CRO gives an output which is
61781. More than fifty years have gone by ......... Gandhiji passed away.?
61782. An average responding rectifier type electronic voltmeter has its scale calibrated in terms of rms value of sine wave. If 100 V peak value square wave is fed to this voltmeter, the reading will be
61783. In low power factor wattmeter, the compensating coil is connected
61784. A permanent magnet moving coil measures
61785. A CT is used to feed current coils of wattmeter, energy meter, power factor meter and an ammeter. Then
61786. In measurements using strain gauge, the dummy strain gauge is used to
61787. In an ac single phase energy meter, the potential coil is put on
61788. The chemical effect of current is used in
61789. In a single phase power factor meter the phase difference between currents in the two pressure coils is
61790. In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be
61791. Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that
61792. In order to achieve accuracy, the slide wire of a potentiometer should be
61793. In measuring resistance using voltmeter and ammeter, the resistances of voltmeter and ammeter also affect the accuracy of measurement.
61794. The difference between measured value and true value is called
61795. In air friction damping
61796. In indicating instruments the controlling torque is provided by a spring.
61797. For measuring a very high resistance we should use
61798. Assertion (A): Damping in a vibration galvanometer is small.Reason (R): Vibration galvanometer is a PMMC instrument.
61799. In a platinum RTD, the change in resistance for a temperature rise of 50° C is about
61800. The gauge factor of a semiconductor strain gauge is about