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What are the two ways of decreasing current in a standard test circuit?
Wiki User
∙ 14y ago
Increase the resistance (ohms)
Decrease the voltage (Volts)
Wiki User
∙ 14y ago
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How can an ammeter loading effect the circuit under test?
Since internal resistance of the ameter will increases the resistance of the circuit. Thus decreasing the current giving an errorenous reading.
Why does the open-circuit test essentially show only excitation losses and not in copper losses?
In an open circuit test full load current does not flow, hence you wont get copper loss.
What is the purpose of open circuit test and short circuit test of a transformer?
An open-circuit test is done with the transformer running at its rated voltage but with no load. This measures the power lost in the magnetic core. (IR Losses) A short-circuit test is done with the transformer running at its full rated current in all windings but at a low voltage. The secondary is shorted and the primary voltage is adjusted to give the rated current. This measures the power lost in the copper windings. (Copper losses)
What is difference between Hipot and IR test?
With Hipod leakage current of any circuit (HT Distribution/ Transmission Lines) can be determine and with IR Test insulation resistance between two circuit or parts of machine is determined.
How armature resistance can be determined in a synchronous generator?
synchronous impedance can be calculated by performing oc test and sc test. by oc test,since the armature current is zero Vt=Ef . in short circuit test ,entire emf is consumed in circulating the short circuit current Isc,through the synchronous impedance. Zs=Ef/Isc.= (open ckt. terminal voltage for a certain field current)/(short ckt. current at the same field current)
How can an ammeter loading effect the circuit under test?
Since internal resistance of the ameter will increases the resistance of the circuit. Thus decreasing the current giving an errorenous reading.
What is continuity test?
a continuity test is the checking of an electric circuit to see if current flows. That it is in fact a complete circuit.
What is a continuity test?
a continuity test is the checking of an electric circuit to see if current flows. That it is in fact a complete circuit.
How do you correctly test if a circuit is not live?
Use a multimeter and test if there is a voltage drop or current over the wire circuit.
What can be used to test if electricity is flowing in a circuit?
A Galvanometer can be used to detect the presence of current in a circuit. An ammeter can be used to know the magnitude of the current flowing through the circuit.
Why 28 days test required for mcb testing why not 30 days?
The standard for testing of Miniature Circuit Breakers - IEC 60898 has arbitrarily decided on 28 days during which the temperature rise is to be measured. The standard states: "The circuit-breaker is in the closed position, the current being established and interrupted by an auxiliary switch. During this test the circuit-breaker shall not trip. During the last period of current flow the temperature-rise of the terminals shall be measured." If the characteristic can be verified for 28 days, the MCB passes the test. Hence 28 days, and not 30 days.
Why rated current should flow in the secondary for short circuit test in transformer?
Open Circuit test is done to find out core losses of the transformers.which include Eddy Current Losses and Hysteresis Losses only, if during open circuit test secondary will have some load then I2R losses due to load current in secondary as well primary will be included in test results which is not desired while performing Open circuit test.
How do you test a electrical circuit?
use a tester. its like a screwdriver with a little light on top that should light up if a current passes through it. test at various points to ensure current reaches all parts of the circuit
Why do you put the meters in the high voltage side in the short circuit test?
in the short circuit test we applied supply voltage on L.V side and short circuit the H.V side and connect the ammeter in H.V circuit to measure the short circuit current. with the help of s.c test we measure the copper losses in the transformers.
Why does the open-circuit test essentially show only excitation losses and not in copper losses?
In an open circuit test full load current does not flow, hence you wont get copper loss.
How the synchronous impedence and armature resistance can be determined in a synchronous generator?
synchronous impedance can be calculated by performing oc test and sc test. by oc test,since the armature current is zero Vt=Ef . in short circuit test ,entire emf is consumed in circulating the short circuit current Isc,through the synchronous impedance. Zs=Ef/Isc.= (open ckt. terminal voltage for a certain field current)/(short ckt. current at the same field current)
Open circuit and short circuit test?
Open circuit means the circuit is not continuous . A short circuit is continuous but has a fault connecting between either live to neutral or earth .As result of this we saw that this answer is unsufficent to explain short and open circuit on the other hand you can use this answer also like i did:)
