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
Compare Horizontal axis and vertical axis wind machines on the basis of: (i) Power captured for the same tower height. (ii) Noise problem. (iii) Complexity of design and yaw mechanism (iv) Effect of fatigue arising from numerous resonances in structure.
Define the following terms related to logic families: (i) Noise Margin (ii) FAN-OUT (iii) Propagation delay (iv) Power dissipation.
What is the full form of ELV shaft?
What is the type of shaft?
What is the full form of LT shaft?
How does a UPS enhance power distribution efficiency?
How do you calculate the power efficiency of an SMPS?
What are the characteristics of a high-efficiency power supply?
What is the importance of power supply efficiency?
How do inverters enhance the efficiency of power distribution systems?
How does a switch-mode power supply improve efficiency?
How do you install a power monitoring system for energy efficiency?
How does cross-conduction affect the efficiency of a power converter?
How does switching frequency affect the efficiency of a power converter?
How does synchronous rectification improve efficiency in switch-mode power supplies?
How does linearization improve the efficiency of RF power amplifiers?
How to find efficiency in maximum power transfer theorem?
What is the formula for power conversion efficiency?
What is the power efficiency of a circuit?
What is the difference between maximum power transfer theorem and efficiency?
What is the efficiency of the maximum power transfer theorem?
What is the difference between maximum power transfer and efficiency?
What is the efficiency of maximum power transfer?
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.
State the effects of low power factor on efficiency and voltage regulation of short transmission lines.
How does the USA compare in terms of energy efficiency in power generation?
How do energy efficiency programs impact power generation in the USA?
How does a basic synchronous rectifier improve power efficiency?
How does a basic power factor correction (PFC) circuit improve efficiency?
How does a basic synchronous rectifier improve efficiency in power supplies?
How does a synchronous buck converter improve efficiency in power electronics?
How does a resonant converter achieve high efficiency in power electronics?
How does a synchronous rectifier improve the efficiency of a power converter?
How do you calculate the efficiency of a power converter?
Define the terms: (i) Load factor (ii) Diversity factor (iii) Demand factor (iv) Plant capacity factor.
Define the following terms: (i) Average demand (ii) Load factor (iii) Plant capacity factor (iv) Plant use factor
Define the following terms. (i) Precision (ii) Drift (iii) Resolution (iv) Back lash
Explain the function of: (i) DB (ii) Socket (iii) Cable (iv) Switch.
Give one application of (i) Mineral oil (ii) Varnish (iii) Synthetic oil (iv) Vegetable oil.
Compare copper and aluminium on the basis of: (i) Tensile strength (ii) Conductivity (iii) Specific gravity (iv) Application.
State the use of following: (i) Screw driver (ii) Nose pliers (iii) Wire gauge (iv) Test lamp.
Name any two applications of following gases. (i) Nitrogen (ii) Hydrogen (iii) Sf6 (iv) Air.
Classify wiring. State the type of wiring installation used for following applications with justification: (i) Hospital (ii) Spinning mill (iii) Milk Dairy (iv) Hotel.
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.
State Magneto-striction. Draw Hysteresis loop for: (i) High silicon steel (ii) Copper (iii) Soft iron (iv) Wood.
Draw and explain the use of: (i) Combination plier (ii) Tester (iii) Wire Striper (iv) Hammer.
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.
State functions of the following parts of d.c motor: (i) Pole shoe (ii) Commutator (iii) Brushes (iv) Yoke.
Name the material used and the sensitivity of the following thermocouple type: (i) J (ii) K (iii) R (iv) S.
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