Question: 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
Answer:
MCQ: 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
Correct Answer:
A. The incoming machine is faster
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Related Questions
- 1. An electrodynamometers type of instrument is used in Weston type synchroscope while synchronizing an incoming machine to busbars
- 2. 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 :
- 3. 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
- 4. 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 :
- 5. 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
- 6. 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 :
- 7. 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
- 8. A wheatstone bridge has ratio arms of 1000Ω and 100Ω resistance, the standard resistance arms consists 4 decades resistance boxes of 1000,100,10 ,1 Ω steps. The maximum and minimum value of unknown resistance which can be determined with this set up is
- 9. A wheatstone bridge can not be used for precision measurements because errors are introduced into on account of
- 10. A Kelvin-varley slide consists of 4 decade dividers. The first decade is constructed by having 11 coils of 10 kΩ resistance each. The subsequent decades will have coils of :
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