A thin aluminum sheet with an emissivity of 0.25 on both sides is placed between two very large parallel plates, which are maintained at uniform temperatures T1 = 600◦C and T2 = 325◦C and have emissivities ε1 = 0.5 and ε2 = 0.8, respectively. Determine the net rate of radiation heat transfer between the two plates, per unit surface area of the plates,

(a) without the radiation shield, and

(b) with the radiation shield. What is the percentage reduction in heat transfer with the shield?

In an air standard diesel cycle, the conditions of the air at the start of the compression stroke are 2 bar and 30℃. The pressure rises to 30bar after compression, and through combustion, 1200 kJ of energy is added per kg air. Calculate

1. Compression ratio
2. Cutoff ratio
3. Mean effective pressure
4. Temperature and pressure at the end of each process
5. work done per kg air
6. Thermal efficiency of the cycle

A flat metal belt, made of Beryllium-Copper (BeCu), is Sf = 375 MPa and transmits at 8,84 rpm and 8.25 kW of power. The distance between the two spindle axes on the same horizontal plane is 935 mm and belt life is 10⁶ turns. The friction coefficient between the belt and the pulley will be 0.34, the operating coefficient is 1.41, and the design coefficient will be 1.55. The diameter of the translated pulley is 3.25 times the diameter of the motor pulley. The belt thickness is 0.20 mm and in case of using a minimum diameter pulley, calculate the belt width and length. The belt width should be 5 mm and its multiples. Calculate the pretension force to be applied

What is the meaning of knocking

What is sublimation?

Select one:

a. A liquid substance changes directly to a gas

b. A solid substance changes directly to a gas

c. A liquid substance changes directly to a solid

d. All answers

What is the job of an inspector?

Select one:

a. To check the balance sheet

b. All answers

c. To check the quality and the condition of equipment

d. To check the design of used equipment

What is the key difference between hot rolling and cold rolling?

Select one:

a. The piece is above or below the boiling point

b. The piece is above or below the working surface

c. The piece is above or below the recrystallisation temperature

d. The piece is above or below the triple-point temperature

What is the most common Hazard in any workplace?

Select one:

a. Slips, trips and falls

b. Suffocation

c. Arc eye

d. Electrocution

Clear my choice

What is the process called which uses a wax pattern coated with a ceramic material to form the shape of the desired casting?

Select one:

a. Investment casting

b. Forcing

c. Die casting

d. Extrusion

What is the process of deposition?

Select one:

a. All answers

b. A gas changes to a solid

c. A liquid changes to a solid

d. A solid changes to a gas

What is the unit for forces?

Select one:

a. Newton

b. Kilo

c. Volt

d. Ampere

Clear my choice

What is the upper yield force?

Select one:

a. The force required to begin to stretch the specimen

b. The force required to fracture a material

c. The force beyond which the material exceeds the elastic limit

d. The maximum capacity of a tensile testing machine

What property of a material’s ability is conductivity?

Select one:

a. Conduct heat and electricity

b. Conduct electricity only

What sampling techniques are used in industry?

Select one:

a. Random sampling

b. Specified sampling

c. All answers

d. 100 % sampling

What should be the allowance made for when bending material to a specified angle?

Select one:

a. Springback

b. Breaking

c. Bend allowance

d. Springboard

c. Conduct matter only

d. Conduct heat only

PLEASE ONLY FINAL ANSWER NO NEED FOR DETAILS

What type of drawing is showing a detailed set of sizes and instructions for the making of a part?

Select one:

a. Component drawing

b. Isometric drawing

c. Process drawing

d. Sectional drawing

What type of drawing reflects piping flow together with the installed equipment and instrumentation?

Select one:

a. Sectional drawing

b. Isometric drawing

c. Process drawing

d. Layout drawing

Which description fits the main memory of a computer?

Select one:

a. Non volatile

b. Read access memory

c. Permanent

d. Temporary

Which is not a storage device?

Select one:

a. Pen

b. Digital camera

c. CD- ROM

d. USB Storage Device

Which of the following describes a hazard?

Select one:

a. Something that will hurt you

b. Something that has no danger to you

c. Something with the potential to cause harm

d. Something you must accept

Which of the following describes a risk?

Select one:

a. A report detailing an event which caused an injury

b. The chance or likelihood of a hazard causing harm

c. The event of an accident

d. A permit which must be completed for safety

Which of the following is a possible way to reduce bending in roofing?

Select one:

a. Insulating

b. Painting

c. Corrugating

d. Waterproofing

Which of the following is not a manufacturing process for engineering metals and non-metals?

Select one:

a. Forging

b. Baking

c. Rolling

d. Casting

Which of the following metals is the stiffest?

Select one:

a. Tungsten

b. Tin

c. Mild steel

d. Copper

Which of the following sentences is written in the Past Tense?

Select one:

a. The man is wearing a hat.

b. The bird is singing in the tree.

c. The cat slept on the floor.

d. The woman is holding a book.

hich of the following types of valve is not exposed to fluid flow?

Select one:

a. All answers

b. Globe valve only

c. Gate valve only

d. Ball Valve only

Why do we use a tolerance in Engineering?

Select one:

a. Components cannot be made to an accurate size

b. Tolerances are not used on drawings

c. To make the component look good

d. The draughtsperson needs practice with numbers

Why do you need to control the wet film thickness?

Select one:

a. To use a WFT gauge

b. To help the coating dry

c. All answers

d. To ensure the final dry coating is to standard/specification

Why should calibration always be completed in a controlled temperature environment?

Select one:

a. You can wring slip gauges together

b. The inspector likes to be warm

c. Temperature variation effects size

d. Calibration can take place at any temperature

Clear my choice

PLEASE ONLY FINAL ANSWER NO NEED FOR DETAILS

what are 5 entropy sources can be found in house ? and how to reduce the entropy generation of each of the 5 sources .

The table below shows the net weekly demand of Audi Car model. The lead time to receive the door is 2 weeks. In week 0, there are 5 cars and 15 doors in inventory. It is expected to receive 30 reworked doors in week 10.

Complete the following MRP table for the doors:

In a table, compare the vertical and horizontal centrifugal casting processes. What is the good and bad about each type? What products can be made by each?

Can u a answer & I'll rate a thumbs up?

Question-4 (40%)

A 75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high efficiency motor that has an efficiency of 95.4 percent. The motor operates 4368 hours a year at a load factor of 0.75. Taking the cost of electricity to be $0.12/kWh, determine:

a) the amount of energy (kWh/year) and money ($/year) saved as a result of installing the high-efficiency motor instead of the standard motor. (20 points)

b) the simple payback period (in months) if the purchase prices of the standard and high-efficiency motors are $5449 and $5520, respectively. (10 points)

c) If the life of the motor is 2 years, is it cost effective to buy 91.0% efficiency motor or 95.4% efficiency motor? Explain. (10 points)

For a homogenous surface ?0 is a constant and, therefore, it would be expected that the same value for ?0 would result for further measurements. However, in this measurement set-up different values of ?0 would be observed for different wind directions. Can you guess what might be the reason for that? Explain your thinking.

A pair of bevel gears has the velocity ratio equal to (1.5). The driven gear
has 20 teeth of (15.71) circular pitch and runs at 600 r.p.m. Calculate accurately
all dimensions and make working drawing showing the gears engaged. The shaft
diameters of driver and driven gears are 30 mm and 25 mm respectively.
Additionally, make the hub diameter equal to (1.7) from the shaft diameter.
Backing for driver and driven are 28 mm and 22 mm respectively

The ocean heats during the day by absorbing sunlight and then cools at night by emitting infrared radiation. Over 12 hours of daylight, you can assume the average energy input to the ocean is 700 W/m². How hot must the ocean surface be to re-radiate that energy every day?

Note: although there is some dispute based on technical considerations we're not going to discuss here, the hottest surface temperature ever recorded on Earth was in Furnace Creek Ranch, Death Valley, California in 1913 of 330 K (56.7 C). If your answer is exceeding that, think about the problem again and redo the calculation.

i. Assuming you are new engineer working in R & D division at manufacturing company which has decided to evaluate CAD/CAM system to adopt in your company in order to meet Industrial 4.0. (Select your company such plastic moulding, automotive, aerospace, marine etc). The company are required yourself to outline executive report for them to decided which suitable CAD/CAM system can be selected. Your report must discuss the suitable CAD/CAM system by referring to current trend which available can be accessed in the journals, articles, books, market/industrial report etc.