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Higher Study | Electrical and Electronics Measurements | Measurement of Power

A dynamometer wattmeter can be used for
The pressure coil of a wattmeter should be connected on the supply side of the current coil when
One B.O.T. is:
Induction type wattmeter provides accurate readings only when:
When an electric current coil of a wattmeter is connected to the electric current path R and the voltage coil is connected between the electric current R path and the neutral side of the balanced three phase supply, it shows 10 kW. The line voltage along the phase sequence RYB is 400 V. The current drawn by the current path is 54 A. What is the new reading of the wattmeter if the voltage coil is connected between the lines B and the Y paths, even if the electric current coil is continuously present in the line R?
When a dynamo converts electrical energy into mechanical energy, it is called
Z1 and Z2 are connected in series to form a load. A wattmeter’s current coil is connected in series with the load, whereas its pressure coil is connected across Z2. The wattmeter reads:
How many wattmeters would be required to measure power in a 3-phase, 4-wire system?
You are extending the range of a wattmeter. How will you connect the primary of the potential transformer?
How many numbers of coils will be there in a dynamo type power factor meter for balance three phase load?
In the circuit shown, the pressure coils of two wattmeters are connected to:
While measuring power observed by the load using the arrangement shown in the figure, the obtained values voltmeter and ammeter readings are 150 V and 12 A respectively. If the load power factor is unity, the wattmeter reading will be- (the internal resistances of instruments are mentioned in the figure).
A wattmeter has a full scale range of 2500 Watts. It has an error of 1.2% of true value. What would be range of reading if true power is 1250 Watts.
In a crossed coil power factor meter the moving coils should be mounted on which type of shaft and at what angles to each other?
What is the number of wattmeter required to measure the power of a poly phase of a poly phase system containing ‘n’ conductors?
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