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GATE-19: Electrical Measurement & Measuring Instrument Quiz-6
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Question 1
For a 3-phase 4-wire system, how many wattmeters are required for power measurements?
Question 2
A energy meter having a meter constant 1000 revolution per kWh is found to make 30 revolution in 60 seconds. The load power is –
Question 3
Power factor correction can be achieved by which of the following?
Question 4
A Wattmeter is rated at 10 A and 25 V. The current coil has a resistance of 0.1 Ω. The potential coil assumed to be purely resistive having a resistance of 625 Ω. The load current is 10 A and voltage across the load is 25 V. If the potential coil is connected across the load, the error in wattmeter reading is ______%.
Question 5
watt hour meter has a constant current of 4 A passing through it for 6 hours at unity power factor. If the meter disc makes 2208 revolutions during this period, calculate the power factor of the load if the number of revolutions made by the meter are 1472 when operating at 230 V and 5 A for 4 hours. Question 6
Find the individual readings of the wattmeter if the input power to a 3Φ load is 10 KW to 0.8 P.f. two watt meters are connected to measure the power?
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Aug 14ESE & GATE EE
