The sensitivity of electromagnetic digital flow meter can be increased by increasing
Assertion (A): If the reading of an instrument is low, the error is large.
Reason (R): The error of an instrument is certain percentage of its full scale deflection.
A thermocouple instrument can be used over a very wide frequency range.
For a current transformer, the standard secondary rating is
In ac bridge measurements, 'Wagner ground' means
If temperature increases by about 50°, the resistance of thermistor changes to
To measure dielectric loss you would use
Minute cracks in metals and minute faults in welded joints can be detected using
The increase in intensity of trace in a CRO causes a change in
A vibration galvanometer is a
Consider the following statements about mutual inductances:
Which of the following draws minimum power from source?
A diode peak reading VTVM and thermocouple meter are connected across output of an amplitude modulated circuit. In the absence of modulation both meters readV. When sinusoidal AM is applied, VTVM readsThe reading of thermocouple meter will be
The sensitivity of a potentiometer can be increased by
In low power factor wattmeter, the compensating coil is connected
The resistance of resistance strain gauge is about
Consider the following statements about mutual inductances:
In ac bridge measurements, 'Wagner ground' means
Which of these instruments is dynamometers type?
The instrument used to check insulation of household wiring is
Watthour meter is an integrating instrument
An ammeter is
It is required to measure temperature in the range of 1300-1520°C. The most suitable thermocouple is
A megger has a hand driven dc generator.
In a CRO, the time base signal is applied to
Which bridge can be used to measure frequency?
The difference between measured value and true value is called
In a single phase power factor meter the phase difference between currents in the two pressure coils is
A hot wire instrument is not affected by stray magnetic fields.
Assertion (A): A ballistic galvanometer is used to measure charge.
Reason (R): In a flux meter, the damping is large.
Schering bridge operates at a high voltage of aboutkV.
Which of these instrument does not have a control spring?
The time base generator in a CRO gives an output which is
A digital voltmeter can count from 0 toIf full scale reading is 9.V, the resolution of full scale reading is
In air friction damping
Pirani gauge is used to measure
In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be
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
Assertion (A): A transducer needs an output measuring or display device for measuring a non electrical quantity.
Reason (R): In some transducers the output voltage is too small and needs amplification before it can be measured.
A permanent magnet moving coil measures
In Weston frequency meter, the magnetic axes of the two fixed coils are
The switch board instruments
Radiation pyrometer is used to measure temperature in the range of
An average responding rectifier type electronic voltmeter has its scale calibrated in terms of rms value of sine wave. IfV peak value square wave is fed to this voltmeter, the reading will be
The most serious problems in ac bridge measurement is
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.
In indicating instruments the controlling torque is provided by a spring.
For measuring a very high resistance we should use
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.
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