For a spherical thermal reactor with a water moderator in a homogeneous mixture, what is the value of the infinite multiplication factor necessary for the reactor to be critical? The radius of the reactor is 1 m.

An in-line, six-cylinder, 6.6-liter, four-stroke cycle SI engine with multipoint port fuel injection operates át 3000 RPM, with a volumetric efficiency of 89% and AF of 15:1. The engine has bore and stroke'related by S = 0.90 B. The engine has an exhaust pipe between engine and catalytic converter that can be approximated as a round pipe, 1.5 m long and 6.5 cm inside diameter. Exhaust temperature leaving the engine is 477°C, and the average wall temperature of the exhaust pipe is 227°C. Calculate the exhaust temperature entering catalytic converter [°C].

Statement:
Selection of compressor and refrigerant for HVAC system that is operating on Vapor Compression Refrigeration System. The heat load is 120,000 BTU/hr and temperature is to be maintained at space is 50C.
Step 1:
Select ambient and environmental conditions
Step 2:
Select refrigerant, preliminary calculations, use of property charts, suction discharge pressure of compressor to achieve required cooling, compressor capacity etc.
Step 3:
Select compressor (Stage, rpm, displacement, size etc)

need detailed solution

Water is flowing in a compressor steadily at 20 kPa and 40 oC to 1.7 MPa and 500 oC. The power input to the compressor is determined to be 5 MW. The water enters the compressor at a height of 5 m and leaves at 10 m of height. The velocities of the water coming in and out of the compressor are 50 m/s and 180 m/s respectively. a) Determine the work input per unit mass for the water flowing through the compressor. b) Calculate required mass of flow rate of the water.

Find the change of entropy of a 2kg steam initially at 1MPa, 200C in a rigid tank until heated to 300C.

ANSWER THE FOLLOWING

1. What is a machine guide?

2. Why is a machine guide required in the manufacturing industry?

3. Provide 5 examples of machine guide, either by drawing or actual photos

4. When building a machine guide, what are the things to be considered? Why?

5. What difficulties did you encounter in making the shop exercise?

6. What is a fitment? Describe its importance in the manufacturing industry

7. What are tolerances? Why is it important?

8. Provide a flowchart diagram of how tolerances are analyzed and implemented.

9. What are tolerances?

10. To buy, a back saw what specification is needed?

11. When buying a claw hammer what specification is needed?

12. Give (2) functions of machine guide?

A steam power plant operates on an ideal regenerative Rankine cycle. Steam enters the turbine at 6 MPa and 450oC and is condensed in the condenser at 20 kPa. Steam is extracted from the turbine at 0.4 MPa to heat the feedwater in an open feedwater heater. Water leaves the feedwater heater as a saturated liquid. Show the cycle on a T-s diagram and determine the fraction of steam extracted from the turbine for the open feedwater heater.

How applied mechanics terminologies such as moment, moment of inertia and frictional matters are involved to theoretically design hydro power and wind mills for renewable energy supply?

Show the core design parameter’s hydro power and wind mills.  Related to them (terminologies in their usual applications) to perspective of Hydro-power and wind mills for theoretical design perfections

1. A turbojet engine is fitted to an aircraft flying at M = 0.65 in conditions where the

ambient temperature is 216 K and the ambient pressure is 18.75 kPa. You are to assume

adiabatic flow.

The following data on the engine are known:

Intake efficiency ?? = 1.00 Intake maximum pressure ratio ?? ??? = 0.95 Compressor pressure ratio ?? = 12 Compressor polytropic efficiency ?? = 1 Combustion chamber efficiency ?? = 1 Turbine Inlet temperature ?4 = 1796 ? Calculate:

a. The total temperature and pressure at entry to the compressor.

b. The total temperature and pressure at entry to the combustion chamber.

c. The fuel-to-air ratio in the combustion chamber.

1. Describe in detail the concept of primary and secondary tools in ergonomics. Provide example to demonstrate your understanding.

1. Propose and justify a workstation redesign to minimize the exposure you’ve selected. Provide pictures or sketching to assist your example.

Explain the advantages of a sodium-filled exhaust valve

An actual aircraft is cruising at -55.4°C, 18.8 kPa and 900 km/h. A heating system keeps the wings just above freezing temperatures of 0°C. Should the wing diameter evaluated as D = 0.5m, the following are to be determined:

(i) Estimate the suitable Nusselt number for this situation,

(ii) Compute the average convection heat transfer coefficient on the wing surface, and;

(iii) Evaluate the average rate of heat transfer per unit surface area.