Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781337264419
Author: Stephen L. Herman
Publisher: Cengage Learning US
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Chapter 11, Problem 7RQ
Name two functions of transformer oil.
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An aircraft is flying trim stick-fixed at steady level flight with a speed of 80 m/s and at standard sea level conditions, where the air density is 1.225 kg/m3 . The ratio of the wings' surface area to the tail plane’s surface area is 10, the tail arm is 10 m and the wings’ mean aerodynamic chord length is 2 m. The ratio of the tail plane’s lift to the wings’ lift is -0.01 at that condition. The rest of the known data are given in the two tables at the end of the question. Justify any assumption that you make.
a) Calculate the total lift and tail plane lift coefficients, the wings’ load and Calculate the down-wash angle and the tail plane angle of attack
Chapter 11 Solutions
Electrical Transformers and Rotating Machines
Ch. 11 - What are the three main sources of heat in a...Ch. 11 - What is one advantage of shell-type construction...Ch. 11 - How are larger control transformers supplying a...Ch. 11 - What is a way to increase cooling on a large...Ch. 11 - What is one special problem with dry-type...Ch. 11 - What are two types of cooling medium used in...Ch. 11 - Name two functions of transformer oil.Ch. 11 - What type of coolant/insulator is banned in the...Ch. 11 - Name two ways of increasing the cooling of...Ch. 11 - What hazard is involved in water-cooled...
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- Answer a and barrow_forwardCơ cấu tạo hình được thiết kế để tạo ra hành trình cắt chậm và quay trở lại nhanh chóng với lưỡi gắn với con trượt tại C. Xác định vận tốc của khối con trượt C tại thời điểm 0=60° nếu liên kết AB đang quay với vận tốc góc 4 rad/s. 45° A. V 1.74(m/s) B. Vc=1.84(m/s) C. Vc = 1.24(m/s) D. Vc=1.64(m/s) 125 mm B = WAB 4 rad/s 300 mm Aarrow_forwardplease help solvearrow_forward
- please help solvearrow_forwardTwo springs and two masses are attached in a straight vertical line as shown in Figure Q3. The system is set in motion by holding the mass m₂ at its equilibrium position and pushing the mass m₁ downwards of its equilibrium position a distance 2 m and then releasing both masses. if m₁ = m₂ = 1 kg, k₁ = 3 N/m and k₂ = 2 N/m. www.m k₁ = 3 (y₁ = 0). m₁ = 1 k2=2 (y₂ = 0) |m₂ = 1 Y2 y 2 System in static equilibrium (Net change in spring length =32-31) System in motion Figure Q3 - Coupled mass-spring system Determine the equations of motion y₁(t) and y₂(t) for the two masses m₁ and m₂ respectively: Analytically (hand calculations)arrow_forwardTwo large tanks, each holding 100 L of liquid, are interconnected by pipes, with the liquid flowing from tank A into tank B at a rate of 3 L/min and from B into A at a rate of 1 L/min (see Figure Q1). The liquid inside each tank is kept well stirred. A brine solution with a concentration of 0.2 kg/L of salt flows into tank A at a rate of 6 L/min. The diluted solution flows out of the system from tank A at 4 L/min and from tank B at 2 L/min. If, initially, tank A contains pure water and tank B contains 20 kg of salt. A 6 L/min 0.2 kg/L x(t) 100 L 4 L/min x(0) = 0 kg 3 L/min B y(t) 100 L y(0) = 20 kg 2 L/min 1 L/min Figure Q1 - Mixing problem for interconnected tanks Determine the mass of salt in each tank at time t > 0: Analytically (hand calculations)arrow_forward
- please help solvearrow_forwardA steam pipe is covered with two layers of insulation. The inner layer (k = 0.17 W/m-K) is 30 mm thick and outer layer (k = 0.023 W/m-K) is 50 mm thick. The pipe is made of steel (k = 58 W/m-K) and has inner diameter and outer diameter of 160 and 170 mm, respectively. The temperature of saturated steam is 300 °C and the ambient air is at 50 °C. If the inside and outside heat transfer coefficients are 30 W/m²K and 5.8 W/m²-K respectively, calculate the rate of heat loss per unit length of the pipe.arrow_forwardAn aluminium pipe carries steam at 110 °C. The pipe (k 185 W/m °C) has an inner diameter of 100 mm and an outer diameter of 120 mm. the pipe is located in a room where the ambient air temperature is 30 °C and the convective heat transfer coefficient between the pipe and air is 15 W/m2°C. .2.1) Neglecting the convective resistance of the steam, determine the heat transfer rate per unit length of pipe. hs o 1101 2.2) To reduce the heat loss from the pipe, it is covered with a 50 mm thick layer of insulation (k 0.20 W/m C). Determine the heat transfer rate per unit length from the insulated pipe. Assume negligible convective resistance from the steamarrow_forward
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