Electrical Measurements Mock Test 5

1. A single-phase load is connected between R and Y terminals of a 220 V, symmetrical, 3-phase, 4 wire systems with phase sequence RYB. A watt-meter is connected in the system. The watt-meter will read (pf = 0.8 lagging)?

2. At overloads, magnetic shunt ________

3. Creeping in an energy meter can be found using _________

4. Self braking torque is _________

5. In the measurement of 3-phase power by 2 watt-meter method, if the 2 watt-meter readings are equal, the power factor of the circuit is?

6. Light load adjustment involves _________

7. Phase sequence indicator gives the maximum value of phase voltages.

8. In olden days voltmeters were __________

9. Power flowing in 3-phase, 3-wire system is measured by two wattmeter whose readings are 7000 W and -2500 W. if the voltage of the circuit is 400 V, then what will be the value of capacitance introduced in each phase to make one wattmeter reads zero? The frequency is 50 Hz.

10. Eddy e.m.f produces a torque.