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The switch board instruments?

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The switch board instruments should be mounted in vertical position.

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Operating torques in analogue instruments are deflecting, control and damping.

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According to application, instruments are classified as?
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What do you mean by secondary instruments?

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Compare analog and digital instruments .

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Parameter Analog Instrument Digital Instrument  1 Principle The instrument that displays analog signals is called as on analog instrument.  The instrument that displays ... , etc. Logical analyzer, signature analyzer, computers, microprocessor based instruments, etc. 

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calibration and the need of calibration for measuring instruments.

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Advantages of digital instruments

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1. They are having high input impedance, so there is no loading effect 2. They are having higher accuracy 3. An unambiguous reading is obtained 4. The output can be interfaced with external equipment 5. They are available in smaller size . 

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State the effect of dead zone on instruments.

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Define: i) Range ii) Span of instruments

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Explain the essential toques in analog type measuring instruments.

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State two purposes of calibration of measuring instruments.

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List three types of errors in measuring instruments. Give reasons of occurring for any one of them.

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State the meaning of secondary instrument. Classify secondary instruments.

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Secondary instruments: - Gives reading directly of the quantity being measured. - Calibrated with respect to absolute instruments  Classification of Secondary instruments:  1. Depending on the ... on permissible error: i) Standard meters ii) Substandard meters iii) First grade instruments.

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Define following terms related to measuring instruments: i) Sensitivity ii) Selectivity.

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List out any four effects of electric current used in measuring instruments & write name of meter working on it.

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Effects of Electric Current used in measuring instruments:  1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.  2. Electromagnetic induction ... . Electrostatic effect: Voltmeters.  5. Hall Effect: Flux meter, Poynting vector wattmeter.

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Describe systematic errors in measuring instruments.
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Describe systematic errors in measuring instruments. 

Answer :

Systematic errors: -  ➢ Instrumental Error: These errors are caused due to the mechanical structure of measuring instrument.  a) Inherent shortcomings of instruments: Instrument may read ... or electrostatic fields.  ➢ Observational Error: Parallax errors, incorrect multiplying factor. 

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Compare primary and secondary instruments.
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Compare primary and secondary instruments.

Answer :

Primary instruments  Secondary instruments  Gives magnitude of quantity in terms of physical constants of instrument  Gives reading directly of the quantity measured.  Need no calibration  ... .  e.g. magnetic meter, induction meter, hotwire meter and electrostatic meter 

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State the material used for moving coil and former for PMMC instruments.
Description :

State the material used for moving coil and former for PMMC instruments. 

Answer :

Material Used for Moving Coil and Former for PMMC Instruments:  Material used for moving coil: Copper  Material used for Former: Aluminium

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asked Sep 5, 2018 by anonymous
List any four effects employed in measuring instruments.
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List any four effects employed in measuring instruments.

Answer :

Effects Employed in Measuring Instruments: 1. Magnetic Effect 2. Electromagnetic induction 3. Heating effect 4. Electrostatic effect 5. Hall Effect 

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asked Aug 25, 2017 by anonymous
Standard Commands for Programmable Instruments (SCPI)
Description :

Standard Commands for Programmable Instruments (SCPI)

Answer :

Standard Commands for Programmable Instruments (SCPI) SCPI stands for Standard Commands for Programmable Instruments it is often pronounced as Skippy. SCPI is a instrument language that control the ... is for storing data in instrument. Display : for presentation.

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asked Dec 22, 2020 by anonymous
Switch Board Wiring Practical
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Switch Board Wiring Practical

Answer :

Practical Significance Switch board wiring is very important. Improper connections of neutral and live (phase) wire in a switch board is dangerous and leads to electric shock while maintenance work. ... Connect upper plate to the box with screws. j. Test the board with test lamp.

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asked Jun 17, 2018 by anonymous
Which of the following instruments can be used for measurement of very high value resistances such as
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Which of the following instruments can be used for measurement of very high value resistances such as insulation resistance in industries? A) Wheatstone bridge B) Megger C) Ohm-meter D) Resistive potentiometer 

Answer :

Which of the following instruments can be used for measurement of very high value resistances such as insulation resistance in industries? A) Wheatstone bridge B) Megger C) Ohm-meter D) Resistive potentiometer 

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