Compare the martensite and tempered martensite in terms of the phases they contain, ductility, strength and microstructure, explain the reasons for the differences.

A rotating shaft has four masses A, B, C, and D attached to it. The planes that these masses rotating at are spaced equally. The magnitude of the masses are 6.5, 11.8, 4.2, and 5.1 kg, respectively. Calculate the radii that the masses should be placed at from the center of the shaft such that the system be in a complete dynamic balance. The shaft angular speed varies between 1760 and 1875 r.p.m. Assume whatever dimension or quantity that you decide it is necessary.

A thin-walled tube with a diameter of 6 mm and length of 20 m is used to carry exhaust gas from a smoke stack to the laboratory in a nearby building for analysis. The gas enters the tube at 200°C and with a mass flow rate of 0.005 kg/s. Autumn winds at a temperature of 15°C blow directly across the tube at a velocity of 5 m/s. Assume the thermophysical properties of the exhaust gas are those of air. (a) Estimate the average heat transfer coefficient for the exhaust gas flowing inside the tube. (b) Estimate the heat transfer coefficient for the airflowing across the outside of the tube. (c) Estimate the overall heat transfer coefficient U and the temperature of the exhaust gas when it reaches the laboratory. (Note: 90°C is a reasonable guess for the tube temperature.)

1.What is the value for the Nusselt number on the inside of the tube?

2.What is the average inside heat transfer coefficient, in W/m²·K?

3.What is the value of the Nusselt number on the outside of the tube?

4.What is the average outside heat transfer coefficient, in W/m²·K?

5.What is the overall heat transfer coefficient, U, in W/m²·K?

6.What is the temperature of the gas at the outlet of the tube, in °C?

1. Consider example of any four bar mechanism. first perform the kinematic analysis(Position,Velocity,Acceleration).And then find the following
   1. Complete Free body diagram.
   2. Complete Matrix equation for the mechanism force analysis.
   3. Values of all Variables involved ( mass, mass moment of Inertia, Force, Torque ).
   4. Equations used for mass, mass moment of Inertia of each link.
2. Find center of Percussion of a sports stick, racket or bat

Consider the general plane motion of a rigid body. At any given instant, the velocities of the various particles of the rigid body are the same as if the body were rotating about a point on the plane, called the __________. Choose the best answer according to our textbook.

Question 4 options:

Design a double-dwell cam to move a follower from 0 to 2.5 in. in 60°, dwell for 120°, fall 2.5 in. in 30°, and dwell for the remainder. The total cycle must take 4 sec. Size the cam for a 1-in. radius roller follower considering pressure angle and radius of curvature. Use eccentricity only if necessary to balance these functions. Plot both these functions. Draw the cam profile. Repeat this for a flat-faced follower. Which one would you use?

How to calibrate non-contact CMM(Coordinate Measuring Machine)? Explain in detail.

Describe the different impacts that local or global scales of action may have on a proposed policy. Of the two, which scale of action is more impactful for a commercial building retrofitting?

Describe a flow with non-zero curl and negative divergence. Provide a common example of when this type of flow occurs.

Determine the Maximum Range for the Gulfstream G550 at 41,000 feet. The weight of the plane when full of fuel is 91,000 pounds, and it holds 6,165 gallons of fuel (6.67 pounds per gallon). The wingspan is 91.5 feet and the wing platform area is 1,137 square feet. The Oswald efficiency factor is 0.9 and the zero-lift drag coefficient is 0.0165. The Specific Fuel Consumption rate is 0.6414 pounds per pound-hour.

Why air-cooled and furnace-cooled materials cooled for a duration of 1 hour or 60 minutes.

Using the Lumen Method to find out how many fittings are required for a square conference room which requires 500 lux from CIBSE Guide, of area 200 m2, using the T5 fluorescent fittings at 1.2 meter long each and at 2 m high measured from the light source to the working surface.
The 1.2m T5 luminaire has 2700 lumens each.
Your answer should mention about all the light losses, say, due to surface reflectance at ceiling, wall and floor, light loss factor, maintenance factor, etc,.

Please refer to the article titled as “Sustainable Construction Excellence for a Better Future in Malaysia, published in The Ingenieur, Vol. 69 January – March 2017 by the Board of Engineers Malaysia. Identify the key challenges in sustainable construction and what should be undertaken to achieve sustainable cities?

A manufacturing process produces piston rings, with ID (inner diameter) dimension as shown above. Process variation causes the ID to be normally distributed, with a mean of 10.021 cm and a standard deviation of 0.040 cm. a. What percentage of piston rings will have ID exceeding 10.075 cm? What percentage of piston rings will have ID exceeding 10.080 cm? (4) b. What is the probability that a piston ring will have ID between 9.970 cm and 10.030 cm? (This is the customer’s specification that the supplier tries to provide .) (ie.) If the specification is “9.970cm < ID < 10.030cm”, what %’age of piston rings are “out of spec”? c. Half (50%) of all piston rings have ID below 10.021 cm. What is the dimension corresponding to the smallest 10%, and what is the dimension corresponding to the largest 10%? What is the dimension corresponding to the smallest 20%, and what is the dimension corresponding to the largest 20%