1. List one advantage and one limitation of a hand pull-back.

2. List the 3 types of radiation emitted from welding processes and the eye damage each can cause?

3.

List the type of circular saw blade appropriate for each of these cutting tasks.

a.) all hard and soft wood for cross, rip or miter cuts

b.) cutting brass, aluminum and bronze

c.) crosscutting of veneers or shipboard

d.) cutting thin steel and sheet iron

4. What are 3 factors that influence the useful life of a respirator canister or cartridge?

UESTION 6

Two or more parts rotating in opposite directions create a __________.

The process of replacing a process to reduce exposure to a hazard is ___________.

The most hazardous type of woodworking machinery is_________?

Who may remove a lockout/tagout device?

The OSHA standard for control of hazardous energy sources (lockout/tagout) is 29 CFR 1910.______.

Moist air enters an air-conditioning system as shown in the figure below at T₁ = 28°C, ?₁ = 85% and a volumetric flow rate of (AV)₁ = 0.89 m³/s. At the exit of the dehumidifying section, the air is saturated, ?₂ = 100%, and the condensate leaves this section at the same temperature as the moist air. At the exit of the heating section the moist air is at T₃ = 24°C, ?₃ = 50%. The system operates at steady state, the pressure is 1 bar at all locations, and kinetic and potential energy effects are negligible.

Determine the heat transfer rate for the dehumidifying section, in kw

Assume that you have two cylindrical steel samples with 1 in diameter, one made out of AISI 1045 and another one made out of AISI 4140. You austenitize and quench both samples in oil. Then you cut a section and measure the hardness at the center of each sample. Would you expect to get the same results? Explain your answer.

A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power cycle with a thermal efficiency of 30%. For the heat pump, Refrigerant 134a is compressed from saturated vapor at -10°C to the condenser pressure of 10 bar. The isentropic compressor efficiency is 80%. Liquid enters the expansion valve at 9.6 bar, 34°C. For the power cycle, 80% of the heat rejected is transferred to the heated space.

(a) Determine the power input to the heat pump compressor, in kW (b) Evaluate the ratio of the total rate that heat is delivered to the heated space to the rate of heat input to the power cycle. Round answers to 3 significant digits.

Refrigerant 134a is the working fluid in a vapor-compression heat pump system with a heating capacity of 60,000 Btu/h. The condenser operates at 180 lbf/in.², and the evaporator temperature is 0°F. The refrigerant is a saturated vapor at the evaporator exit and a liquid at 110°F at the condenser exit. Pressure drops in the flows through the evaporator and condenser are negligible. The compression process is adiabatic, and the temperature at the compressor exit is 180°F. Determine

Round answers to 3 significant digits.

the following plastic and composite processing techniques explain the two manufacturing processes: 1- extrusion 2- blow molding.

Note: sketches are required and your explanation should include discussion about the process, tooling, products and materials.

The fatigue life of a component is 5 x 10⁵ cycles at 200MPa and 2 x 10⁵ cycles at 400MPa. If this component is subjected to the loading sequence: 100 cycles at 200 MPa and 100 cycles at 400 MPa, which repeats indefinitely, which one of the answers below is closest to the component’s expected fatigue life? Pick one answer only.

A. 2.86 x 10⁵ cycles

B. 2.93 x 10⁵ cycles

C. 3.23 x 10⁵ cycles

D. 3.52 x 10⁵ cycles

Design a steam power plant that works as an ideal Regenerative Rankine cycle with 2 closed feedwater heaters cascaded backwards by selecting their extraction pressures to optimize cycle efficiency. The available steam conditions at the exit of the boiler are 3 MPa and 590 °C and the condenser pressure is 20 kPa. The steam flow rate at the inlet of the turbine is 80 kg/s. A T-s diagram for the cycle should be provided along with a table showing the pressure, temperature, enthalpy and entropy of all the states at the optimized point. Also, mention the net power output and rate of heat rejected from the cycle as well as the fractions of the working fluid extracted for each feedwater heaters at the design point.

Air enters a turbine operating at steady state at 10 bar, 1200 K and expands to 0.8 bar. The turbine is well insulated, and kinetic and potential energy effects can be neglected. Assuming ideal gas behavior for the air, what is the maximum theoretical work that could be developed by the turbine in kJ per kg of air flow?

A jet propulsion engine has an air that enter the compressor at 100 kPa and 290K. The pressure ratio across the compressor is 14 and the turbine inlet temperature is 1500K. When the air leaves the turbine, it enters the nozzle and expands to 100kPa. Determine the pressure at the nozzle inlet and the velocity of the air leaving the nozzle

Important notes: Please be neat and write legibly, it’s important that I understand your writing and follow your thoughts. And write what tables you are using and solving every step with fully details and from which tables you got the numbers please solve it clearly

Write a project which study steady state conduction in series /parallel configuration such as are used in conventional residential constryuction .This includes analysis of the walls ,windows,doors and cieling .

Also calculate energy saving for it by using modern cumputer tools .

In an air standard Otto cycle, the maximum and minimum temperatures are 1400 and 15?C. The heat supplied per kilogram of air is 800 kJ. Calculate the compression ratio and the cycle efficiency. Calculate also the ratio of maximum to minimum pressures in the cycle.

ANSWERS(5.24/1; 48.5%; 30.42/1

A four-cylinder petrol engine has a swept volume of 2000 cm3, and the clearance volume in each cylinder is 60 cm3. Calculate the air standard cycle efficiency. If the introduction conditions are 1 bar and 24 ?C, and the maximum cycle temperature is 1400 ?C, calculate the mean effective pressure based on the air standard cycle.

ANSWERS(59.1%; 5.30 bar)