# The sensitivity of an instrument is

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The sensitivity of an instrument is ratio of the change in the magnitude of the output to the corresponding change in the magnitude of the input.

## Related questions

An analog voltmeter has a sensitivity of 10kΩ/volt. The galvanometer used in constructing the instrument will produce a full scale deflection when the current passed through it is  (a) 10 mA (b) 20 mA (c) 50 mA (d) 100 μA

The moving system of an indicating type of electrical instrument is subjected to (a) a deflecting torque (b) a controlling torque (c) a damping torque (d) All of the above

The full scale range of PMMC voltmeter is 100 V and its sensitivity is 1000 Ω/V. If the meter reads 50 V, the current through the voltmeter is (A) 0.05 mA (B) 0.5 mA (C) 5 mA (D) 50 mA

The sensitivity of a voltmeter using 0-5 mA meter movement is (a) 200 Ω/V (b) 150 Ω/V (c) 100 Ω/V (d) 50 Ω/V

An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to  (1) 1.414 times dc sensitivity (2) dc sensitivity (3) 0.9 times dc sensitivity (4) 0.707 times dc sensitivity

In the case of an instrument reading of 8.3 V with a 0 to 150 voltmeter having a guaranteed accuracy of 1% full scale reading, the percentage limiting error is   (A) 1.810% (B) 0.181% (C)12.45% (D) 0.0018%

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

The percentage limiting error, in the case of an instrument reading of 8.3V with a 0 to 150V voltmeter having a guaranteed accuracy of 1% full-scale reading is

A Pyrheliometer is an instrument to measure :  (A) temperature of solar photovoltaic cell  (B) intensity of direct solar radiation at normal incidence  (C) intensity of indirect solar radiation  (D) efficiency of a solar photovoltaic cell

The burden of the instrument transformers is (A) VA rating (B) secondary winding current (C) secondary winding voltage (D) (secondary winding current)2 × resistance of secondary winding

The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are  A) Perpendicular B) Parallel C) Inclined at 60" D) Inclined at 30°

What is the definition of a primary instrument?

The most accurate instrument for measuring phase difference between two signals is (A) X− Y plotter (B) oscilloscope (C) phase sensitive detector (D) electronic counter/timer

In a PMMC instrument, the damping provided is :  (A) air damping (C) eddy current damping (B) fluid damping (D) magnetic damping using a magnet

Which of the following instrument can be used for measuring speed of an aeroplane ? (A) orifice plate (B) hot wire anemometer (C) rotameter (D) pitot tube