What is the main source of error in a null detector? Explanation: Resistance of contact wires and power dissipation are some of the causes for error in a null detector. But insufficient sensitivity is the major source of error in a null detector such as a galvanometer.
What are the sources of error in bridge circuit?
Errors due to stray magnetic fields Leakage errors Eddy current errors Residual errors Frequency and waveform errors.
Which is not a source of error in measurement of low resistance?
Which is not a source of error in the measurement of low resistance? Explanation: As the current flowing through a low resistance circuit is low, the voltage drop across the terminals due to contact and lead resistances is negligible.
Which of the following principles does Megger works on?
electromagnetic induction
Megger is a portable instrument to measure high insulation resistances. It works on the principle of electromagnetic induction. The electrical power to a megger is provided by a permanent magnet D.C. generator.
Does Kelvin Bridge is used for measurement of low resistance due to contact and lead resistance?
Explanation: While measuring very low resistances the contact and lead resistances cause significant errors in the value of the measured resistance. As a result Kelvin bridge is used for measurement of low resistances.
What are the sources of errors in this experiment?
Common sources of error include instrumental, environmental, procedural, and human. All of these errors can be either random or systematic depending on how they affect the results. Instrumental error happens when the instruments being used are inaccurate, such as a balance that does not work (SF Fig.
What are the sources of errors in case of the Wheatstone bridge?
Errors in Wheatstone Bridge
The difference between the true and the mark value of the three resistances can cause the error in measurement. The galvanometer is less sensitive. Thus, inaccuracy occurs in the balance point. The resistance of the bridge changes because of the self-heating which generates an error.
Which of the following measuring instrument has a very low resistance?
ammeter
An ammeter usually has low resistance so that it does not cause a significant voltage drop in the circuit being measured. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.
Which method is suitable for measurement of low resistance?
Ammeter Voltmeter Method:
Connecting voltmeter across the load is suitable for low resistance measurements.
Which of the following is more accurate in measuring low resistances?
Accurate measurement of very low resistance is possible with Kelvin’s Double Bridge Method.
What is Megger and its working?
Megger is an electrical instrument used to determine the range of resistances between zero to infinity. Initially, the pointer is at the infinite position, it gets deflected when an emf is generated from infinity to zero, which depends on Ohm’s law. There are two types of meggers, manual and electrical megger.
What is Megger explain its working?
Definition: The Megger is the instrument uses for measuring the resistance of the insulation. It works on the principle of comparison, i.e., the resistance of the insulation is compared with the known value of resistance.The accuracy of the Megger is high as compared to other instruments.
What is the power source used in a digital Megger?
The megger consists of a DC generator, its armature is hand-driven to generate a voltage. A clutch mechanism is used to slip after reaching a certain determined speed. Resistance R1, R2 connected in series with two coils, Coil A and Coil B which constitute one instrument to which an indicating pointer is attached.
Which of the following error is eliminated by Kelvin bridge?
Explanation: Effect of contact and lead resistances are completely eliminated in a Kelvin bridge as they don’t appear in the balance equation.
Can potentiometer measure resistance?
The DC potentiometer method of measurement of resistance is used for measuring the unknown resistance of low value. The voltage drop across the known and unknown resistance is measured and by comparison the value of known resistance is determined.
What is the effect of load and contact resistance in Kelvin bridge Maxwell inductance capacitance bridge is used for measurement of inductance with?
Explanation: A Maxwell inductance capacitance bridge is used for the measurement of inductance by making comparison with a standard capacitance value. Voltmeter is used to measure voltage, while an ammeter is used to measure current.
What is source of error?
Instead, sources of error are essentially. sources of uncertainty that exist in your measurements. Every measurement, no matter how precise we. might think it is, contains some uncertainly, simply based on the way we measure it.
What are the 3 types of errors in science?
There are three types of errors: systematic, random, and human error.
- Systematic Error. Systematic errors come from identifiable sources.
- Random Error. Random errors are the result of unpredictable changes.
- Human Error. Human errors are a nice way of saying carelessness.
What are the four major sources of measurement error?
Measurement errors are commonly ascribed to four sources: the respondent, the interviewer, the instrument (i.e., the survey questionnaire), and the mode of data collection.
What are the sources of errors in the meter bridge experiment and give their Minimizations?
1. Error due to sliding of jockey on the wire:Due to sliding of the jockey, heat is produced due to friction. Thus, the area of wire can be deformed and resistance of the wire may change. To minimise this error,jockey is tapped on the wire.
What are the sources of errors in this experiment resonance tube?
Answer: Factors which could have altered the waveforms include background noise, drift stemming from temperature, and the distance between the tuning fork and the microphone and the distance between the person humming and the microphone…..
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