75051. The accuracy of measurement using CRO is about
75052. The channel required for FM telemetry is
75053. Assertion (A): Absolute instruments are used in standard laboratories.Reason (R): Absolute instruments do not require calibration.
75054. 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.
75055. A digital voltmeter can count from 0 to 9999. If full scale reading is 9.999 V, the resolution of full scale reading is
75056. The most serious problems in ac bridge measurement is
75057. 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.
75058. The pointer of an indicating instrument should be
75059. The resistance of resistance strain gauge is about
75060. Which bridge can be used to measure frequency?
75061. The time base generator in a CRO gives an output which is
75062. 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
75063. In low power factor wattmeter, the compensating coil is connected
75064. A permanent magnet moving coil measures
75065. A CT is used to feed current coils of wattmeter, energy meter, power factor meter and an ammeter. Then
75066. In measurements using strain gauge, the dummy strain gauge is used to
75067. In an ac single phase energy meter, the potential coil is put on
75068. The chemical effect of current is used in
75069. In a single phase power factor meter the phase difference between currents in the two pressure coils is
75070. In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be
75071. 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
75072. In order to achieve accuracy, the slide wire of a potentiometer should be
75073. In measuring resistance using voltmeter and ammeter, the resistances of voltmeter and ammeter also affect the accuracy of measurement.
75074. The difference between measured value and true value is called
75075. In air friction damping
75076. In indicating instruments the controlling torque is provided by a spring.
75077. For measuring a very high resistance we should use
75078. Assertion (A): Damping in a vibration galvanometer is small.Reason (R): Vibration galvanometer is a PMMC instrument.
75079. In a platinum RTD, the change in resistance for a temperature rise of 50° C is about
75080. The gauge factor of a semiconductor strain gauge is about
75081. Which of the following instruments is used almost exclusively to measure radio frequency currents?
75082. The coil of a DArsonval galvanometer has N turns. If flux density is B, current is I and area of coil is A, the deflecting torque is
75083. Consider the following statements regarding electromagnetic flowmeter AC excitation is used to avoid polarisation of fluid.The meter calibration is changed as viscosity of fluid changes.Stainless steel pipes can be used for measuring the flow of liquid of high conductivity. Of the above statements
75084. In a CRO, the time base signal is applied to
75085. Schering bridge operates at a high voltage of about 10 kV.
75086. Which of these instrument does not have a control spring?
75087. In Weston frequency meter, the magnetic axes of the two fixed coils are
75088. A 4-ohm resistor is connected across a 12 V battery.The current flowing will be
75089. Pirani gauge is used to measure
75090. Assertion (A): CRT is the most important component of a CRO.Reason (R): When an electron beam strikes the screen of CRT, a spot of light is produced.
75091. A capacitance transducer has two plates each of area 5 mm2. The coil gap is 2 mm. Displacement sensitivity due to change in gap length is
75092. Four capacitors are in parallel. Their values are 36.3 μF, 3.85 μF, 34.002 μF and 850 μF with an uncertainty of digit in the last place. The total capacitance in significant figures is
75093. In figure, C0 is distributed capacitance and C is tuning capacitor. If C = C1 for fundamental frequency and C = C2 for second harmonic, then C0 =
75094. If M is mutual inductance between fixed and moving coils and θ is deflection of dynamometer instrument, then
75095. The switch board instruments
75096. Radiation pyrometer is used to measure temperature in the range of
75097. The electromagnets of an induction wattmeter
75098. In a vibrating reed frequency meter the natural frequency of two adjacent reeds have a difference of
75099. Assertion (A): CRO can be used to study waveshape accurately.Reason (R): Input impedance of a CRO is very high.
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