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Feed drops to zero volts when light switch is turned on back to 120 volts when turned off feeds fluorescent lights?
voltage is measured by voltagd drops. When a switch is open/ off there is a voltage difference between one side to the other. when the switch is on there is no drop from one side of the switch to the other. That is normal operation. If switch is on, and you get a voltage reading across the switch, the switch is bad.
What does the reading on a ammeter say when the switch is open?
An open switch in a circuit will stop all current flow so the ammeter should read zero amps.
What is a free wheeling diode how is it connected in an automatic voltage regulator circuit?
Inductive load will accumulate stored energy. If an attempt is made to open the switch this energy will arc across the contacts of the switch, and could cause damage to the circuit components. Freewheeling diodes are placed across inductive loads to provide a path for the release of energy stored in the load when the load voltage drops to zero.
When measuring voltage the unit power should be turned off or on?
With the power turned off the voltages in the unit should be zero so no information would be gathered, excect that it it isn't zero there's a serious fault. The power should stay off until the voltmeter is connected, and then the operator should step back and turn the power on using one hand only.
How much will neutral current be in a 3phase 4-wire y system with a balanced load?
Balanced load means no unbalanced currents, so the neutral current should be near zero.
What you will do if both feed pumps tripped when boiler is in service?
Immediately the load on Generator should be reduced to Zero n desynchronised, and the turbine be tripped.
What is zero current transformer?
It is a transformer with No load attach to it.
What is the effort required for zero load?
The effort required for zero load is minimal as there is no external force or resistance to overcome. It typically involves low to no exertion or energy expenditure.
When voltage regulation will be zero it operate it?
A transformer will operate with a voltage regulation of zero when it is not supplying a load.
Will an open switch record a resistance of zero ohms?
no...... ideal open switch should have a resistance of infinity... the question should be a closed switch http://wiki.answers.com/Q/Will_an_open_switch_record_a_resistance_of_zero_ohms" but this is also false because any good conductor will have a small resistance the connecting wire resistance is exhibitted across the terminals of the switch
What is zero voltage regulation in transformers and what it means?
'Zero voltage regulation' indicates that there is no difference between its 'no-load voltage' and its 'full-load voltage' -this is only the case for an 'ideal' transformer.
In beams what is a zero bar?
A zero bar is a bar in a truss that supports no load but is only there for the stability of the structure
