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Shaft power iv) efficiency
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The power input to a 500V 50Hz 6Pole 3 phase induction motor running at 975 rpm is 40 kW. The stator losses are 1kW and friction and windage losses are 2kW. Calculate: (i) Slip (ii) Rotor copper loss (iii) Shaft power (iv) Efficiency

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What is the formula for power conversion efficiency?

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What is the difference between maximum power transfer theorem and efficiency?

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What is the efficiency of the maximum power transfer theorem?

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What is the difference between maximum power transfer and efficiency?

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A 500kVA distribution transformer having copper and iron losses of 5kW and 3kW respectively on full load. The transformer is loaded as shown below: Loading (kW) Power Factor (Lag) No. of hours 400 0.8 06 300 0.75 12 100 0.8 03 No load - 03 Calculate the all-day efficiency.

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State the effects of low power factor on efficiency and voltage regulation of short transmission lines.

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How does the USA compare in terms of energy efficiency in power generation?

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How do energy efficiency programs impact power generation in the USA?

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How does a basic synchronous rectifier improve power efficiency?

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How does a basic power factor correction (PFC) circuit improve efficiency?

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How does a basic synchronous rectifier improve efficiency in power supplies?

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How does a resonant converter achieve high efficiency in power electronics?

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How does a synchronous rectifier improve the efficiency of a power converter?

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How do you calculate the efficiency of a power converter?

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Define the terms: (i) Load factor (ii) Diversity factor (iii) Demand factor (iv) Plant capacity factor.

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Define the following terms: (i) Average demand (ii) Load factor (iii) Plant capacity factor (iv) Plant use factor

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Define the following terms. (i) Precision (ii) Drift (iii) Resolution (iv) Back lash

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Explain the function of: (i) DB (ii) Socket (iii) Cable (iv) Switch.

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Give one application of (i) Mineral oil (ii) Varnish (iii) Synthetic oil (iv) Vegetable oil.

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Compare copper and aluminium on the basis of: (i) Tensile strength (ii) Conductivity (iii) Specific gravity (iv) Application.

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State the use of following: (i) Screw driver (ii) Nose pliers (iii) Wire gauge (iv) Test lamp.

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Name any two applications of following gases. (i) Nitrogen (ii) Hydrogen (iii) Sf6 (iv) Air.

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Classify wiring. State the type of wiring installation used for following applications with justification: (i) Hospital (ii) Spinning mill (iii) Milk Dairy (iv) Hotel.

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State significance of earthing. Draw and explain pipe earthing. State the values of earth resistances for: (i) Substation (ii) Residential wiring (iii) H.T. Line (iv) L.T. Line.

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State Magneto-striction. Draw Hysteresis loop for: (i) High silicon steel (ii) Copper (iii) Soft iron (iv) Wood.

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Draw and explain the use of: (i) Combination plier (ii) Tester (iii) Wire Striper (iv) Hammer.

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Select insulating materials for following parts: (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

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State functions of the following parts of d.c motor: (i) Pole shoe (ii) Commutator (iii) Brushes (iv) Yoke.

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