Engineering Answers

Assume 4.5 kg/sec of steam at 305°C, 1.5 Mpa expands isentropically in a turbine and exhaust at 138 kpaa, AP=0, AK-0. Sketch the process on the TS plane and find a) Exhaust temperature t₂, b) Work in Kw and KBTU/hr.

A rigid vessel contains 6 kg of wet steam at 0.4 MPa with a quality of 75% until the steam

has a temperature of 300C. Determine the initial internal energy and the final pressure.

Liquid A decomposes by first-order kinetics, and in a batch reactor 50% of A is converted in a 5-minute run. How much longer would it take to reach 75% conversion?

n a slab milling operation the diameter of cutter is 50 mm and number of teeth of cutter is 12. If the 

cutter spindle speed is 300 rpm, depth of cut is 2 mm, length of job is 500 mm and table longitudinal 

feed is 200 m/min what will be the feed per tooth during the milling operation? If the cutter over travel 

is 2 mm what is the machining time for the single pass milling operation?

A mild steel square tank with a wall thickness of 8mm contains water at 80˚C. The thermal conductivity of amild steel is 50W/m.K and the heat transfer coefficients for the inside and outside of the tank are 2800W/m2.K, and 11W/k2.K respectively. Sketch and label the temperature profile and calculate the rate of heat loss per m2 of tank surface area when the atmospheric temperature is 25˚C.

100 liters of certain liquid has a mass of 85 kg. Determine the specific weight and gravity of the liquid

1. 7.23 × 1024 Al atoms = grams Al

Two resistor RA = 1.95ohms, and RB = 0.05 ohm are connected in parallel and take a total current of 50 amp. What is the current through each resistor.

Three resistors A, B, and C are connected in parallel to a 120 volt source. If RA is = 60 ohms and RB is = 40 ohms, IC is 5 amp, calculate the equivalent resistance and the total current of the circuit.

8. Use the steam tables to calculate the enthalpy change (in kJ) of 2 kg-mol of water/steam when heated from:

a) 293 K & 100 kPa to 303 K & 100 kPa.

b) 400 K & 100 kPa to 900 K & 100 kPa..