For the flow field ?⃗ = ? + Ω × ? , where ?⃗ and Ω are constant linear- and angular velocity vectors, use index notation to find its strain rate tensor ??? and rotation tensor ???.

Explain the pros and cons of an HCCI engine. Why isn’t it a viable engine technology at the moment?

The bandwidth of a bang-bang position servo is _____. a. small b. large

Three return steam lines in a chemical processing plant enter a collection tank operating at steady state at 5 bar. Steam enters inlet 1 with flow rate of 2 kg/s and quality of 0.9. Steam enters inlet 2 with flow rate of 2 kg/s at 200°C. Steam enters inlet 3 with flow rate of 1.2 kg/s at 95°C. Steam exits the tank at 5 bar. The rate of heat transfer from the collection tank is 40 kW. Neglecting kinetic and potential energy effects, determine for the steam exiting the tank:

(a) the mass flow rate, in kg/s.

(b) the temperature, in °C.

Annealing is a process by which steel is reheated and then cooled to make it less brittle. Consider the reheat stage for a 100-mm-thick steel plate (ρ= 7830 kg/m³, c= 550 J/kg·K, k= 48 W/m·K), which is initially at a uniform temperature of Ti= 120°C and is to be heated to a minimum temperature of 550°C. Heating is effected in a gas-fired furnace, where products of combustion at ∞T∞= 800°C maintain a convection coefficient of h=250 W/m²·K on both surfaces of the plate. How long should the plate be left in the furnace?

Search the Internet for pertinent information that supports the integration of unmanned aerial systems into the National Airspace Plan and the Air Traffic Control system.

Summarize, describing how ATC Interoperability can be smoothly integrated and also discuss problems associated with this integration. Some subjects to consider are human factors, low altitude operations safety, noise reduction, UAS traffic management, and UAS wake separation standards for UAS integration into the NAS.

A pressurised air tank supplies compressed air to a new hybrid air engine. When the hybrid engine is not running the absolute pressure in the tank is 320 bar and the temperature of the air is 50°C.

Typical gas molecular values:

Gas Symbol Mr (g/mol)

Hydrogen H2 2

Oxygen O2 32

Carbon Dioxide CO2 44

Methane CH4 16

Nitrogen   N2 28

Air (none available) 28.96

Calculate:

(a) The temperature of the air in the high pressure air tank when the air engine starts and the absolute pressure in the tank drops to 280 bar. Volume remains constant.

(b) The mass of air in the pressurised air tank using the temperature and pressure from part 1 (a) and the information given here below.

Note:1 m3 = 1000 litres

1 bar = 1 x 105 Pa

R is the universal gas constant and is always 8.314 J·K-1·mol-1

Tank volume = 450 litres pV = (m/Mr)RT

True or False: The maximum magnitude of stress due to bending σmax occurs at the horizontal (x) position that the magnitude of bending moment M is a maximum.

Discuss the multiple factors which affect/control the maximum drawing ratio per pass in drawing processes?

Discuss multiple effects of die angle in extrusion process on the overall energy consumption process?