Example.3. A fan of diameter 0.7m running at 1500r.p.m. delivers 140m /min of air at 15°C against 75mm of water of total pressure when its total efficiency is 86 percent. Determine the volume of air delivered, total pressure developed and horsepower consumed, if (a) the air temperature is 50°C, (b) the air temperature is 50°C and the fan speed is increased to 1700r.p.m (c) the conditions are same as in (b) but a 0.6m diameter, geometrically similar fan is used.

The exhaust nozzle of a jet engine expands air at 300 kPa and 180C adiabatically to 100 kPa. Determine the air velocity at the exit when the inlet velocity is low and the nozzle isentropic efficiency is 96 percent.

Suppose you have an ideal refrigerator that cools an environment at -18.0°C and has heat transfer to another environment at 51.0°C. What is its coefficient of performance?

19 please need help, keep in mind the 7 basic units and watch the sig figs thank you so much.

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An ideal gas initially at Pi=2atm Vi=3m^3and Ti follows the cycle shown. a. Find the net work done by the gas per cycle b. If Ti=25C what is the number of moles in gas

Consider a process (expansion/compression) of a gas (e.g. Ar) in a sealed cylinder surrounded by another gas (e.g. air). Which of the following statements is correct in regards to a change in entropy? Select one: 1. ΔtotS can assume any value: negative, positive or zero, depending on the experimental conditions 2. Δtot S  ≥ 0 always 3. ΔsurrS = 0 4. ΔtotS  > 0 5. none of the other answers

A heat engine takes in 2500J and does 1500J of work.   a) How much energy is expelled as waste?            b) What is the efficiency of the engine?

A heat engine using 1.0 mol of a monatomic gas follows the cycle shown in the figure. 3750 J of heat = 37507 A heat engine using 1.0 energy is transferred to the gas during process 1 - > 2. (Figure 1) AE₁-2 mol of a monatomic gas follows the cycle shown in the figure. 3750J of heat energy is transferred to the gas S → 3 in this cycle. Express your = Part E Complete previous part( during process 1 → 2. (Figure 1) Correct Part D Determine W for process 2 answer to three significant figures and include the appropriate units. W s) Part F Complete previous part(s) Part G Complete previous part(s) 8-3 p (kPa) Panax 3750 J 300 T₁ = 300 K 0 0 V Vmin Vmax=2Vmin

If a heat engine performs 200J or work while absorbing 1000 of heat energy from the hot reservoir, what is the efficiency of this engine? A. 20% В. 80% С. 25% D. 50% E. 100%