Question: There will be serious errors, if power factor of non-sinosoidal waveform is measured by electrodynamometer power factor meters. This is true of :
Answer:
MCQ: There will be serious errors, if power factor of non-sinosoidal waveform is measured by electrodynamometer power factor meters. This is true of :
Correct Answer:
A. Only single phase meters
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Related Questions
- 1. In a reed type frequency meters all the reeds :
- 2. A 53 Hz reeds type frequency meter is polarized with d.c. the new range of frequency meter is :
- 3. For a 3 phase, moving iron synchroscope<em>F<sub>2</sub></em><sub> </sub>= frequency of incoming machine<em>F<sub>1</sub></em><sub> </sub>= frequency of busbars At equilibriumΦ = ±2πf’t + ɑ ; where f’ = <em>F<sub>2 </sub></em><sub> </sub>- <em>F<sub>1.</sub></em>If f’ is positive
- 4. An electrodynamometers type of instrument is used in Weston type synchroscope while synchronizing an incoming machine to busbars
- 5. An alternator is being synchronized to the busbars whose frequency is 50 Hz. The bulbs of the synchroscope flickers at a frequency of 10 Hz. The frequency of the alternator is :
- 6. A phase sequence indicator rotates clockwise for phase sequence of <em>RYB. </em>If the phase sequence is changed to <em>BRY</em> it will rotate
- 7. In a static type phase sequence indicator which uses two identical lamp of pure resistances in the circuit of phase R and Y and inductor in phase B having inductive reactance = resistance of bulb with circuit being connected in star. The reactance is equal to the bulb resistance. If bulb connected to phase R glows brightly and lamp connected to phase Y glows dimly, the phase sequence is :
- 8. A resistance of value 10Ω approximately is to be measured by ammeter-voltmeter method with resistance of ammeter is 0.02Ω and that of voltmeter is 5000Ω. The resistance should be measured
- 9. A unknown resistance is measured by substitution method. First a standard known resistance of 100 Ω is connected in series with a circuit having a rheostat and a galvanometer. The battery voltage is 10V and the setting of rheostat is 500 Ω and the galvanometer shows a deflection of 60°. After this test. The battery voltage goes down to 9 V and when the unknown resistance is substituted for the known resistance, the galvanometer again shows a deflection of 60° with the same setting of the rheostat. The value of unknown resistance is :
- 10. Equal resistance of 100 Ω each are connected in each arm of wheatstone bridge which is supplied by 2 V battery source. The galvanometer of negligible resistance connected to the bridge can sense as low current as 1 µA. the smallest value of resistance that can be measured is
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