Why is dynamometer type instrument chiefly used as a wattmeter?

As the dynamometer instrument has Square Law response so can be used on both the DC as well as on AC. It is mainly used to measure both AC and DC power. Hence, used as a wattmeter. These instruments are free from hysteresis and Eddy current errors.

When a dynamometer instrument is used as a wattmeter?

Explanation: Dynamometer type wattmeter is used for the measurement of A.C. as well as D.C. power. It consists of a fixed coil forming the current coil whereas the moving coil forms the potential coil.

Why dynamometer type wattmeter can be used for both AC and DC?

As the instrument has Square Law response so can be used on both the dc as well as on AC. These instruments are free from hysteresis and Eddy current errors. It is because of absence of iron in the operating part of the instrument.

What is the principle of dynamometer type wattmeter?

Dynamometer type wattmeter works on very simple principle and this principle can be stated as when any current carrying conductor is placed inside a magnetic field, it experiences a mechanical force and due to this mechanical force deflection of conductor takes place.

Which of the following instrument is used as wattmeter?

Dynamometer wattmeter:

Electrodynamometer types of instruments are used as A.C. voltmeters and ammeters both in the range of power frequencies and lower part of the audio power frequency range. They are used as wattmeters, voltmeters and with some modification as power factor meters and frequency meters.

19 related questions found

Which instrument is not used as wattmeter?

Moving coil instructions and moving iron instructions can be used as ammeter and voltmeter but can't be used as wattmeter. So, moving iron wattmeter does not exist.

Which of the following instrument is used as wattmeter Mcq?

Electro Dynamometer Type Instruments MCQ Question 10 Detailed Solution. An electrodynamometer instrument can be used as a wattmeter to measure power and frequency.

What are the advantages of dynamometer type wattmeter?

Advantages of Dynamometer type instrument:

As the instrument has Square Law response so can be used on both the dc as well as on AC.
These instruments are free from hysteresis and Eddy current errors. ...
Ammeter up to 10A and voltmeter up to 600V can be constructed with precision grade accuracy.

What is wattmeter and wattmeter is used to measure which quantity?

The wattmeter is an instrument for measuring the electric active power (or the average of the rate of flow of electrical energy) in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.

What is the advantage of dynamometer?

Costs less than a tension meter. Ensures safety on the job site. Reduces damage on objects. Increases efficiency of the work done on the site by providing accurate and reliable measurements.

Which type of wattmeter can be used for both AC and DC?

A. both D.C. and A.C.

Which type of wattmeter can't be used for both AC and DC?

Right Answer is:

Induction type wattmeter is used for the A.C measurement only whereas the Dynamometer type wattmeter is used for DC only. Electrostatic type instrument does not come in the category of the wattmeter and it is used for voltage measurement.

How dynamometer type instrument used as wattmeter explain with neat diagram?

The fixed coil produces a field F_m, and the moving coil creates a field F_r. The field F_r tries to come in line with the main field F_m, which provides a deflecting torque on the moving coil. Thus, the pointer attached to the spindle of the moving coil deflects.

Why is wattmeter used in measuring power?

Wattmeter measures the average power. So, wattmeter is a device capable of detecting voltage, current and the angle between the voltage and the current to provide power readings.

Is wattmeter is a indicating instrument?

10.  1)Indicating: Indicating instruments are those which indicate the instantaneous value of the electrical quantity being measured, at the time at which it is being measured. Their indications are given by pointers moving over calibrated dials(scale), e.g. ammeters,voltmeters and wattmeters.

What does a wattmeter test?

Wattmeters measure how much electricity is being used by an electrical product or circuit.

What are the advantages and limitations of Electrodynamometer type wattmeter?

As the instrument coils are air cared, so these instruments are free from hysteresis and eddy current errors. These instruments can be used on both a.c. and d.c. and since they have a precision grade accuracy, they are very useful as transfer instruments.

What are the errors in dynamometer type wattmeter?

Errors Caused by Mutual Inductance Effect: In between pressure and current coil, the mutual inductance produces an error. Eddy Current Error: It creates own magnetic field in the coil, which effects the main current flowing through the coil. Stray Magnetic Field Error: The main magnetic field is disturbed due to this.

Which effect is used in wattmeter?

Electro dynamics effect is used in wattmeter. Concept: Electro dynamo type wattmeter: The instrument whose working depends on the reaction between the magnetic field of moving coil and fixed coil is known as Electro dynamo meter wattmeter.

What are the type of wattmeter used in electrical circuits?

Types of Wattmeter

Electrodynamometer wattmeter – for both DC and AC power measurement.
Induction wattmeter – for AC power measurement only.

Which type of wattmeter can't be used for DC?

Which type of wattmeter cannot be used for both A.C and D.C? Induction type wattmeter is used for the A.C measurement only whereas the Dynamometer type wattmeter is used for DC only. Electrostatic type instrument does not come in the category of the wattmeter and it is used for voltage measurement.

Which of the following is not an advantage of a PMMC instrument?

Right Answer is: A

3. The frictional error is less in the PMMC instrument. Because it has a high torque/weight ratio. The frictional error more (or) less can be decided by taking the torque/weight ratio.

Which of the following instrument can not be used for the measurement of AC as well as DC quantities?

Detailed Solution. Moving coil instruments are used to measure the DC quantities only. So, a moving coil instrument is NOT directly applicable to measure the quantity of an AC current. The moving iron instrument can be used to measure both AC and DC quantities.