### Discussion :: Measurements and Instrumentation - Section 1 (Q.No.4)

- «« Measurements and Instrumentation - Section 1
- Measurements and Instrumentation - Section 2
- Measurements and Instrumentation - Section 3
- Measurements and Instrumentation - Section 4
- Measurements and Instrumentation - Section 5
- Measurements and Instrumentation - Section 6
- Measurements and Instrumentation - Section 7
- Measurements and Instrumentation - Section 8
- Measurements and Instrumentation - Section 9
- «« Measurements and Instrumentation - Section 10

Kiruthiga said: (Dec 7, 2015) | |

I do not understand. What p.f = 0.5, o = 60. |

Badar Jahangeer said: (Dec 27, 2015) | |

In 3-phase measurement O = 180, 60 degree for each wattmeter, here he told 3-phase measurement with one wattmeter is zero, the remaining two will share, so P.F = 0.5. |

Babu said: (Jan 4, 2016) | |

Power factor = cos $ = 0.5. So, cos $ = 1/2, Or, cos $ = cos 60. So, $ = 60. |

Subhankar Palit said: (Jan 5, 2016) | |

tan $ = 1.732 (W1-W2)/(W1+W2). So tan $ = 1.732 (0.5-0)/(0.5+0). So tan $ = 1.732. so $ = 60. cos 60 = 0.5. |

D Aiysha said: (Jan 7, 2016) | |

Phase angle = 60 degree. PF = 0.5. W1 is positive and W2 = 0. One of the watt meter reads zero. |

Mohammad Inam Uddin said: (Aug 27, 2016) | |

When the meter reading is 0 then power factor will not be 0 according to formula base the pf is 0.5 then meter reading is 0 then power factor will be 0.5. |

Krishna said: (Sep 11, 2016) | |

If reading of one wattmetre is = 0, then $ = 60, therefore cos $ = 0.5. |

Omendra Singh said: (Jan 9, 2019) | |

In 3 phase supply system phase angle is 120 b/w 3 phase. If one wattmeter is not giving reading then one phase is off. Now phase angle b/w 2 phase is 90 and cos 90 is 0 so how answer is 0.5? |

Kalyan said: (Aug 21, 2019) | |

Please give me the explanation clearly to get the answer. |

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