What do you mean by secondary instruments?

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asked Mar 10, 2018 by anonymous

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asked Sep 6, 2018 by anonymous

State the meaning of secondary instrument. Classify secondary instruments.

Last answer: 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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asked Sep 6, 2018 by anonymous

Compare primary and secondary instruments.

Last 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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In majority of instruments damping is provided by?

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Operating torques in analogue instruments are?

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The switch board instruments?

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According to application, instruments are classified as?

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The use of which instruments is merely confined within laboratories as standardizing instruments?

Last answer: The use of absolute instruments is merely confined within laboratories as standardizing instruments.

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asked Mar 10, 2018 by anonymous

How instruments are classified?

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asked Apr 29, 2018 by anonymous

What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased?

What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known

Last answer: What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known

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asked May 22, 2020 by anonymous

Define: primary and secondary distribution system

Last answer: i) Primary Distribution: It is a 3-phase, 3-wire transmission line connected in between receiving substation to Distribution substation. OR It is link between receiving substation & ... substation to consumer line. OR It is link between distribution transformer substation & consumer.

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asked May 3, 2020 by anonymous

State the losses in secondary distribution system.

Last answer: The losses in secondary distribution system: a) Technical losses: 1. Due to poor voltage 2. Due to unbalance load 3. Due poor quality of transformer & its components 4. Due to poor quality ... of induction type of energy meter. 3. Lack of administration. 4. Energy theft 5. Unmetered supply

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53 views 1 answer

asked Sep 6, 2018 by anonymous

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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asked Sep 6, 2018 by anonymous

Why CT is never operated with an open secondary ?

Last answer: CT secondary should never be kept open because it will cause saturation of the core to a high level and very high voltage will appear across the secondary which can breakdown the insulation. One terminal of PT secondary is always grounded to avoid capacitive induction and for human safety

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66 views 2 answers

asked Sep 5, 2018 by anonymous

Write difference between absolute & secondary instrument.

Last answer: Absolute Instrument Secondary Instrument 1. These give magnitude of quantity in terms physical constants of instruments 1. These give reading directly of the quantity at the time of ... Raleigh current balance. 6. Examples - ammeter, voltmeter, amperehour meter, wattmeter etc.

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asked May 8, 2018 by anonymous

Which of the following connection of transformers will give highest value of secondary voltage ?

Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

Last answer: Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

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asked May 8, 2018 by anonymous

Increasing the number of turns of wire on the secondary of a transformer will

Increasing the number of turns of wire on the secondary of a transformer will (A) Decrease the secondary current (B) Increase the primary current (C) Have no effect on the secondary current (D) Increase the secondary current

Last answer: Increasing the number of turns of wire on the secondary of a transformer will Decrease the secondary current

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537 views 1 answer

asked May 8, 2018 by anonymous

A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts

A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts

Last answer: A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts

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asked Apr 29, 2018 by anonymous

If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded

If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then (A) zero sequence currents are present on both sides of the transformer (B) zero sequence currents are absent on both sides of the transformer (C) zero sequence currents are present on the secondary side but not on the primary side (D) zero sequence currents are present on the primary side but not on the secondary side

Last answer: If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then zero sequence currents are absent on both sides of the transformer

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167 views 1 answer

asked Mar 19, 2018 by anonymous

When secondary of a current transformer is open-circuited its iron core will be?

Last answer: When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

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101 views 1 answer

asked Mar 19, 2018 by anonymous

The secondary of a current transformer is always short-circuited under operating conditions because it?

Last answer: The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.

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asked Mar 19, 2018 by anonymous

In a transformer the resistance between its primary and secondary should be?

Last answer: In a transformer the resistance between its primary and secondary should be infinity.

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Electrical Measuring Instruments

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asked Aug 21, 2019 by anonymous

Compare analog and digital instruments .

Last answer: 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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asked Aug 21, 2019 by anonymous

calibration and the need of calibration for measuring instruments.

Last answer: Calibration - It is a process of estimating the value of a quantity by comparing that quantity with a standard quantity. Need of calibration: - Calibration defines the accuracy and ... aim of calibration is to minimize any measurement uncertainty by ensuring the accuracy of test equipment.

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asked Aug 21, 2019 by anonymous

Advantages of digital instruments

Last answer: 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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asked Jul 27, 2019 by anonymous

State the effect of dead zone on instruments.

Last answer: It is the largest change in input during which the output remains constant. So during dead zone, even if input changes, output remains the same.

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asked Jul 27, 2019 by anonymous

Define: i) Range ii) Span of instruments

Last answer: i) Range: It is defined as the difference between Greatest and Smallest value of the data or reading of the instrument. ii) Span: It is defined as the algebraic difference between the upper and lower range values

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asked Sep 6, 2018 by anonymous

Explain the essential toques in analog type measuring instruments.

Last answer: List of torques in analog instruments: 1. Deflecting torque 2. Controlling / Restraining torque. 3. Damping torque. 1. Deflecting torque: To create deflection proportional to ... the speed higher will be the damping torque bringing the pointer to the equilibrium position quickly.

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198 views 1 answer

asked Sep 6, 2018 by anonymous

State two purposes of calibration of measuring instruments.

Last answer: Purposes of calibration of measuring instruments: - The purpose of calibration is to ensure that readings of an instrument are consistent with other instruments. It is also important in determining the ... will need to be calibrated periodically to make sure it can function properly and safely.

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asked Sep 6, 2018 by anonymous

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

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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asked Sep 6, 2018 by anonymous

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

Last answer: i) Sensitivity: It is the ratio of the change in output signal to the change in input signal of quantity being measured. ii) Selectivity: It is the term to describe fulfillment of the requirements of measurement by an instrument to be suitable for use in a given situation.

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asked Sep 6, 2018 by anonymous

Describe systematic errors in measuring instruments.

Last 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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asked Sep 5, 2018 by anonymous

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Last 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.

Last 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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Standard Commands for Programmable Instruments (SCPI)

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anonymous · Answer 1 · 2020-02-04T18:37:12+0000

The instruments which will give the direct readings are called secondary instruments

What do you mean by secondary instruments?

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