Mechanical Engineering Answers

 An open belt 100 mm wide connects two pulleys mounted on parallel shafts with their centers 2.4 m apart. The diameter of the larger pulley is 450 mm and that of the smaller pulley 300 mm. The coefficient of friction between the belt and the pulley is 0.3 and the maximum stress in the belt is limited to 14 N/mm width. If the larger pulley rotates at 120 r.p.m., find the maximum power that can be transmitted.

1.How will you apply a chemical that needs to be ingested by immobile insects?

A. Spray the chemical below the canopy

B.Apply the chemical so that it completely covers the plant

C. Apply the chemical on same parts of the plant

D. Apply the chemical on the stem of the plant

E.Spray the chemical in the air

2. One of the following is not true of internal combustion engine.

A.More mechanical simplicity and lower weight / power ratio

B. it could be started and stopped in a a short time

C. Its thermal efficiency is higher than other heat engines

D.Its initial cost is high

E. It does not need auxiliary equipment, such as boiler and condenser

The brakes on the tractor apart from being basically a safety feature, are also used for:

a.Turning the vehicle

b. Reversing the vehicle

c. Speeding up the vehicle

d. Reducing the power of the vehicle

e. Disconnecting the power from the engine

In a jib crane, the jib and tie rod are 6 m and 5 m long respectively. The height of the crane post is 3 m. When a weight (W) 317 N is suspended from the crane and the tie rod remains horizontal.

Determine the tension in Tie rod (only magnitude, in N)?

 a jib crane, the jib and tie rod are 6 m and 5 m long respectively. The height of the crane post is 3 m. When a weight (W) 317 N is suspended from the crane and the tie rod remains horizontal.

Determine the angle θ (unit in degrees)?

Design a typical cotter joint to transmit a load of 50 kN in tension or

compression. Consider that the rod, socket and cotter are all made of a

material with the following allowable stresses:

Allowable tensile stress sy = 150 MPa

Allowable crushing stress sc = 110 MPa

Allowable shear stress ty = 110 MPa.

The velocity profile of a fluid over a plate is parabolic with its vertex 200 mm from the plate, where the velocity is 1.2 m/s.Calculate the velocity gradients and shear stresses at 50 mim and 200 mm from the plate, if the viscosity of the fluid is 0,8 N. s/m.

in a steam power plant, 2.5 kg of coal is consumed per second and air required for combustion is 16 kg per kg coal fired. Air enters at 27°C and the barometric pressure is 98.5 kPa. The flue gases enter the chimney at a temperature of 300°C and leave at a temperature of 220°C. The ash loss is expected to be 12 % of the consumed fuel. A theoretical dra

The owner of a video store has contacted you to develop a system to keep track of videos and rentals. He feels that with the growing number of customers, such a system will greatly help in managing accounts and providing better customer service.

Derive the process model that you think will be most appropriate for the above situations. Also list your reasons for choosing the process model.

a research and development department is developing a new power supply for a console television set. it has broken the job down into the following

a) Determine the network diagram of activities involved in the project and indicate the 

critical path

b) What is the minimum completion time for the project?