What is the temperature of oil inside 380kv transformer?!
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(b) High voltage electric power transmitted to a city is dropped to a low voltage in a transformer before use. To keep the transformer at a steady temperature, heat (called the Joulean power dissipation) needs to be transferred to an ambient. Assuming the transfomer to be a vertical cylinder with a diameter of 0.4 m and height of 1 m, the walls are kept at 90°C in a stagnant fluid bath Determine the allowable heat dissipation if the fluid is...
What would the temperature inside the pressure cooker be if the vapor pressure of water inside the cooker was 2.74 atm? _______ K
What would the temperature inside the pressure cooker be if the vapor pressure of water inside the cooker was 4.02 atm? K
Light no. 10 oil is heated from 95°F to 105°F in a 0.6 in inside diameter tube. The average velocity of the oil is 2.0 ft/sec. The viscosity of the oil at 100°F is 45 centistokes (cS). What is the Reynolds number inside the tube?
will rate, thanks! A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N/N, for a particular transformer used in a CD player is 3:46. When used with 120-V (rms) household service, the transformer draws an rms current of 240 mA. (a) Find the rms output voltage of the transformer V (b) Find the power delivered to the CD player. w
One of the industrial process is to heat a vegetable oil to a specific temperature by passing the oil through a metal coil that is placed in a warm water path. The oil flows in the coil with a mass flow rate of 0.05 kg/s at 20◦C. The coil consists of ten turns with a diameter of 50 cm that is made copper tubing (350 W/m. K) of 1 cm inside diameter with a 2 mm wall thickness. The total...
Problem 10 Consider a cylinder falling inside a pipe that is filled with oil. The small space between the cylinder ant the pipe is lubricated with an oil film that has viscosity u. Pipe Derive a formula for the steady rate of descent of a cylinder with weight W, diameter d, and length l sliding inside a vertical smooth pipe that has inside diameter D. Assume that the cylinder is concentric with the pipe as it falls. Use the general...
An overload on a distribution zone substation transformer can be detected with: Select one: a. Differential protection b. A top-oil temperature sensor, a winding temperature monitoring system. c. An IDMT or instantaneous overcurrent relay d. A Buchholtz relay.
The pressure inside a gas bottle is 3080 kPa when the temperature is 24.8 °C. What will be the pressure inside the bottle, if 33.9 percent of the gas is released and the temperature of the gas drops to 7.2 °C?
A hot air balloon starts to take off when the temperature inside the balloon is 111 °C higher than the outside air. The pressure is the same inside and outside the balloon and there is a total of 2.50× 105 moles of air in the balloon. Assuming that the air density outside of the balloon is 1.20 kg/m3, what is the total mass of the balloon and its load? The answer is 2.73 × 103 kg. I am not sure...