# The ratio of maximum displacement deviation to full scale deviation of the instrument is called?

The ratio of maximum displacement deviation to full scale deviation of the instrument is called?

The ratio of maximum displacement deviation to full scale deviation of the instrument is called linearity.

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Last Answer : In a PMMC instrument, the damping provided is : eddy current damping

Description : 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

Last Answer : 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 1.001 Ω

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Last Answer : Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

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Last Answer : A multirange instrument has multiple shunt or series resistances inside the meter.

Last Answer : A moving iron instrument can be used for both D.C. and A.C.

Last Answer : The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

Last Answer : In a portable instrument, the controlling torque is provided by spring.

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Description : feature of PMMC instrument.

Last Answer : Consumes less power Great accuracy. High torque to weight ratio

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Last Answer : A)Spring control method: As shown in the figure, the inner ends of the both springs are attahced to the spindle, while outer end of upper spring is attached to the lever and outer ... of spring material: 1.Non Magnetic material 2.Low specific resistance 3.Low temperature coefficient of resistance

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Last Answer : List of torques in analog instruments:  1. Deflecting torque  2. Controlling / restraining torque.  3. Damping torque.  1. Deflecting torque:  - To create deflection of pointer ... .  - Bring the pointer to standstill quickly.  - To minimize oscillations about final position.

Description : Give the classification of the errors used in measuring instrument & state the reason for their occurrence.

Last Answer : Types of errors in measuring instruments:  A) Gross error: These are due to mistakes on the part of person using the instrument.  B) Systematic Error:  i) Instrumental Error: These ... multiplying factor.  C) Random error: These persist even after gross and systematic errors are removed.

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Description : State the meaning of absolute instrument and secondary instrument.

Last Answer : Absolute instruments:   These instruments read the quantity under measurement indirectly i.e. in terms of deflection, degrees and meter constant. The actual value under measurement can be calculated ... of operation (b) Depending upon permissible percentage error. (c) Depending upon application.

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Description : Explain magnetic effect employed in measuring instrument.

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Description : State the function of controlling torque in electrical measuring instrument.

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Description : Write any two advantages of MI type instrument.

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Description : State working principle of PMMC instrument.

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Description : Compare PMMC & MI instrument.

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Last Answer : An instrument which detects electric current is known as galvanometer.

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