# String efficiency is used for measuring the?

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## 1 Answer

### Answer :

String efficiency is used for measuring the degree of utilization of SCR.

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method for improving string efficiency
Last Answer : The Methods of Improving String Efficiency:-   1) By reducing value of ‘m’ or (‘k’) by using longer cross arm. 2) By Making of ‘m’ or (‘k’) equal to zero 3) By grading Insulator. 4) By Using guard ring.

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Give the classification of the errors used in measuring instrument & state the reason for their occurrence.
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State two purposes of calibration of measuring instruments.
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Define following terms related to measuring instruments: i) Sensitivity ii) Selectivity.
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Describe systematic errors in measuring instruments.
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State the function of controlling torque in electrical measuring instrument.
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List any four effects employed in measuring instruments.
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When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because  (A) Cables have a low value of capacitance which draws a high ... high value of charging current (D) Cables have a low value of capacitance and initial resistance
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Last Answer : For measuring a very high resistance we should use Meggar.

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Last Answer : For measuring current at high frequency we should use thermocouple instrument.

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SEER: Seasonal Energy Efficiency Ratio (SEER)
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State why a transformer always have an efficiency of more than 90%.
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Last Answer : Transformer efficiency

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The overall efficiency of Thermal Power Plant is equal to _______________ .  (A) Regenerative Cycle Efficiency (B) Renkine Cycle Efficiency (C) Carnot cycle efficiency (D) None of the above
Last Answer : The overall efficiency of Thermal Power Plant is equal to Regenerative Cycle Efficiency.

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A transformer operates 24 hours day at full -load. It's full -load efficiency is :  (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency
Last Answer : A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency

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The rankine cycle efficiency of steam power plant is  (1) 60-80% (3) 30-45% (2) 45-80% (4) 20-30%
Last Answer : The rankine cycle efficiency of steam power plant is 30-45%

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Transmission efficiency of a transmission line increases with the
Last Answer : Transmission efficiency of a transmission line increases with the increase in power factor and voltage

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For high efficiency of transfer of power, internal resistance of the source should be?
Last Answer : For high efficiency of transfer of power, internal resistance of the source should be less than the load resistance.

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Last Answer : The efficiency of diesel locomotives is nearly 20 to 25 percent.

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Last Answer : The overall efficiency of steam locomotive is around 5 to 10 percent.

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Last Answer : D.C. generators are normally designed for maximum efficiency around full-load.

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Last Answer : The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.

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Last Answer : The range of efficiency for shaded pole motors is 5% to 35%.

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Last Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.

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Last Answer : Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.

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Last Answer : The efficiency of a power transformer is of the order of 98 percent.

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Last Answer : An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.

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For a transformer, operating at constant load current, maximum efficiency will occur at?
Last Answer : For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

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