Mechanical Engineering Questions and Answers June 13, 2021

In the planar mechanism shown in figure the link lengths are given in cm. The ternary link DCE is parallel to the input crank AB. The links BC and EF are parallel to each other at the instant. The slider F is guided in the vertical direction. If the crank AB has an angular velocity of 6 radsec, the velocity of the slider is B 40 40 20 AD20) E 40

A steel plate is exposed to solar heat flux of W 2 800 on one side. The plate is exposed to m air at 30C on both sides. The convective heat transfer coefficients is 10 W 2 mK back side and 15. W 2 mK on the on the front. The equilibrium temperature of plate is (a) 36 C (b) 62 C (c) 86 C (d) 44 C

Problem 1. The vehicle is at rest on a blacktop road that is flat and dry ( 0.80). The torque curve of the vehicle has been measured and can be approximated as RPM 4800 4800 RPM 5800 T(RPM) (Tmax Pmax W 9.455 x 107 w RPM 5800 a) Sketch the motor torque and power graphs. What is the maximum speed of the vehicle and what is the motor torque and

Machine equipment and cutting tools are the major inputs of any manufacturing process. Metal fabrication processes are often an effective way to generate a given product, however, one needs additional modern tools to achieve a high level of specificity and uniformity. To do so, machining tools can be used to selectively remove or finish a piece of

Draw a Helicopter Draw a helicopter using the shapes that have been taught to you in the class. Figure 1 demonstrates the sample object. To complete Q1 your sketch should meet the following criteria: ? Draw a helicopter similar to, but not the same as, the one shown here.[1] ? Use a canvas size of 500 by 500. [1] ? Your helicopter must have at

ASSIGNMENT 1 COURSE NUMBER COMP 1010 Tail Boom Elevator Tail Sync Elevator Tail Fin Elevator Decal Engine Cover A Cockpit Windows Main Rotor Fuselage Cockpit Blades

Tire dimensions and speed ratings are listed in the sidewall of passenger tires as shown in Figure 1. It is given that tire width is 215 mm, sidewall height to width ratio is 65%, and the wheel rim diameter is 15 inches (381 mm). A typical passenger vehicle tire has inflation gage pressure of 30 psi (206.8 kPa). Determine: a) The mass of air [g,

Ratio of height to width (aspect ratio) Nominal width of tire in millimeters Passenger car tire Max. permissable inflation pressure Max. load rating Radial NAME P21565R15 xX CORD MAX LOAD 1300 LBS MAX PRESS 35 PSI GE SIHA NK Rim diameter code xxxxxz NO ONE E Treadwear, traction and temperature grades Load index and speed symbol Severe snow

The Surf and Sand Inns condensed income statement for 20X6 and 20X7 is as follows Room Revenue Room department expenses Undistributed operating expenses Gross operating profit Insurance, property taxes, and depreciation Interest expense Income before income taxes Income taxes Net income 20X6 20X7 3,500,000 3,750,000 1,550,000 1,650,000 775,000

What is your companys mission statement? Break it down into each of its elements, and critically discuss the relevance of each one. Identify several of your companys most important stakeholders, and evaluate the impact, or lack thereof, of your vision and mission statement on each of them. Finally, make recommendations, with examples, of how your

TOPIC(S) 2. Analyse elements of own companys mission statement, evaluate its impact on stakeholders, and recommend improvements POOR Little or no attempt made to analyse elements of own companys mission statement, evaluate its impact on stakeholders, and recommend improvements SCORING CRITERIA DEVELOPING Basic attempt made to analyse elements of

Figure 32 Price Good X Quantity,Assume that good X is a normal good. Suppose equilibrium moves from point A to point C. Which of the following is consistent with the change in equilibrium A decrease in the number of buyers and an increase in business taxes. An increase in the number of buyers and a decrease in business taxes. An increase in the

A metal bar is subjected to a tensile force of 40 kN. The bar has a cross-sectional area of 100 mm^2 and a length of 1 meter. Determine the engineering stress and the engineering strain in the bar. Show all calculations.

A shaft is subjected to a twisting moment of 50 Nm. The shaft has a diameter of 0.1 meters and is made of a material with a modulus of rigidity of 80 GPa. Determine the shear stress in the shaft and the angle of twist. Show all calculations.

A rigid body weighing 200 N is suspended from a uniform bar of length L = 2m and weight W = 50 N. Determine the torque and angle of rotation of the bar when the body is hanging at an angle of 30 degrees from the vertical. Show all calculations.

A piston is used to compress air in a cylinder with a cross-sectional area of 200 cm^2. The initial volume of the cylinder is 0.6 m^3 and the final volume is 0.3 m^3. Calculate the work done by the piston during the compression process. Show all calculations.

A cantilever beam is subjected to a point load of 10 kN at its end. The length of the beam is 2 meters and its second moment of area is 1000 mm^4. Calculate the maximum bending moment and the maximum deflection of the beam. Show all calculations.

A piston is used to pump water from a well. The cross-sectional area of the piston is 0.01 m^2 and the stroke length is 0.1 m. The atmospheric pressure is 100 kPa, the density of water is 1000 kg/m^3 and g = 9.8 m/s^2. Calculate the work done in joules by the piston in one complete cycle (up and down).

A computer network consists of 8 computers and the data transmission rate between each computer is 1 Mbps. If the data size to be transmitted is 1 GB, calculate the time taken for the data to be transmitted from one computer to another.

A piston cylinder assembly contains air at a pressure of 100 kPa and temperature of 300 K. The volume of the air is increased by a factor of 4, while the pressure remains constant. Determine the final temperature of the air.

A 19 tooth pinion paired with a 33 tooth gear has a 2mm module and 20 pressure angle. Tooth forms are standard AGMA full depth involutes. If the centre distance during assembly is increased by 3, then the new pressure angle (in degrees) will be (a) 24.17 (c) 17.49 (b) 22.21 (d) 14.56

In the given epicyclic gear train, S is fixed and arm makes 8 revolutions. Find the number of revolutions made by P. (a) 28 (b) 32 (c) 36 (d) 40.

A mechanical piston is compressing a gas from an initial volume of 0.5 m^3 to a final volume of 0.25 m^3. The initial pressure of the gas is 1 bar, and the final pressure is 2 bar. Calculate the work done by the piston.

A cylindrical tank with a height of 4 m and a radius of 2 m is filled with water to a height of 3 m. Determine the volume, mass, and weight of the water in the tank.

Two identical involute spur gears are in mesh. The module is 4 mm and each gear has 22 teeth. If the operating pressure angle is 20. The minimum value of addendum needed to ensure continuous transmission of motion is (a) 7.5 mm (c) 1.35 mm (b) 5.5 mm (d) 2.35 mm

A punching machine punches 3 cm bore holes in a 4 cm thick plate. It does 540 Nm of work per sq.cm of sheared area. The punch has a stroke of 10 cm and punches one hole every 10 second. The maximum speed of flywheel at radius of gyration is 28 ms. The amount of energy required by flywheel in kJ is

A machine requires a torque of (30050sin2) to drive it. It is directly coupled to an engine producing a torque of (30050sin) in a cycle. How many times the value of torque of the machine and the engine will be the same

A flywheel has mean kinetic energy of rotation equal to 100 Nm. If the coefficient of fluctuation of speed is 0.012. What is the maximum fluctuation of energy in maximum flywheel

A single cylinder vertical engine has a bore of 30.5 cm, a stroke of 40 cm and a connecting rod of 80 cm long, as shown in the figure below. The mass of reciprocating parts is 135 kg. When the piston is at quarterstroke and moving downwards from the top dead centre, the net pressure on it is 65 Ncm. The speed of the engine is 250 rpm, the turning

In steam engine crank has a length of 50 cm and that of connecting rod is 200cm. When crank is perpendicular to connecting rod, piston effort is 100 kN. Turning moment on crank shaft is kN.m. crank 100 rpm.

A machine tool performs an operation intermittently. It is driven continuously by a motor. Each operation takes 8 seconds and five operations are done per minute. The machine is fitted with a flywheel having a mass of 200 kg with a mean radius of gyration of 400 mm. When operation is being performed, the speed drops from the normal speed of 400

In a spring controlled governor, the balls are 300 mm and 400 mm apart when the controlling forces are 200 N and 400 N respectively. Assume that the controlling force curve is a straight line, the initial tension to make the governor isochronous is .

In Orthogonal Cutting, if the feed is 1.25 mmrel and Chip thickness after Cutting is 2mm, Determines the following Chip thickness ratio, Shear Angle Given, rank angle 10 if Shear Strength 600 Nmm, width of Out 10mm, Cuffingspeed 30mmin, Cutting Speed Bonnfrien, coefficient of friction 0.9, Determine, (a) Shear force, (b) friction angle, (C)

A 200 kg block is being pulled up an inclined plane with an angle of 30 degrees. The coefficient of static friction between the block and the plane is 0.4. What is the minimum force required to move the block up the incline

A 2 kg object is suspended from a spring with a spring constant of 100 Nm. The object is displaced downward by 0.2 meters from its equilibrium position and released. What is the maximum velocity of the object as it oscillates

A 15 kg box is pushed across a flat surface with a force of 50 N. The coefficient of kinetic friction between the box and the surface is 0.3. What is the acceleration of the box

In the movie Men in Black agent K is willingly swallowed by a giant extraterrestrial cockroach in attempt to retrieve his laser blaster. Agent K has a mass of 80 kg and his specific internal energy is 63.4 Btulbm. Edgar the cockroach has a mass of 1500kg and a specific internal energy of 28 Btulbm. Medgar Magent K a. What is the total internal

There once was a ship that put to sea, and the name of that ship was the Billy o Tea. The winds blew up, her bow dipped down, and she began to cruise through incompressible (20C) seawater at a steady rate. Consider a situation where the sail is at half mast, exposing 50 ft of sail to the wind in a way that yields a coefficient of drag of 1.2. The

The standard 55 gallon drum is H88 cm high, has an outer diameter of D 61 cm and is made from 0.9 mm thick steel. You are testing the strength of such a drum. The drum is filled with air and hermetically sealed. The Youngs modulus of steel is 200 GPa. po is atmospheric pressure at STP 101 kPa. F P H D You will calculate how much the drum will

Determine the convection heat transfer coefficient, in Wm.K, thermal resistance for convection, in KW, and the convection heat transfer rate, in W, that are associated with air at atmospheric pressure in cross flow over a cylinder of diameter D 200 mm and length L2 m. The cylinder temperature is T, 70C while the air velocity and temperature are V

Write a MATLAB script that will generate a matrix with daily values of time between 0 and 240 minutes corresponding to parking times for up to 10 vehicles for 5 days a week and calculates the daily parking amount to pay and the amount to pay for the week. The program will convert the minutes to whole hours and calculate the cost with an hourly

1. Dolphins breathe in air through their blowhole at the surface of the water, and then dive into the depths to play, hunt, and otherwise live their lives. When they run out of oxygen, they surface to breathe for a while before diving again. Take the air at the surface to have a temperature of Tatm 27C and a pressure of Patm 100 kPa, with a gas

Equation of displacement profile in SHM is yh21cos pi(theta)phi(a) where h lift, phi(a) angle of ascent. The roller radius is 25 mm. Minimum radius of cam is 40 mm and lift is 50 mm, take phi(a) 90. The pressure angle at (23) of rise stroke is degree

The profile of a radial cam is specified as x 15cos(theta) and y 10 5 sin(theta) where is the angle of rotation of the cam and (x,y) are the Cartesian coordinates of the cam profile. The pressure angle at theta 30 is

The net heat transfer Q12 if T 427C and T2 227C and both surfaces are black using the following fig with F16 0.093 and F13 0.04 is.

A 100 W electric bulb has a filament temp of 300C. Assuming filament to be black, diameter of wire if the length of wire is 250mm is

Two black discs 1m in diameter are placed directly opposite to each other at a distance of 0.5m. The discs are maintained at 1000K and 500K respectively. The heat flow between the discs when the shape factor between them is 0.36

Estimate the radiative heat flux if Stefan Boltzman constant is 5.6x108 Wm2K4

A hallow cubical surface having inside of 1m in which a solid cylinder dimensions of diameter 0.5 m and length 0.5m is placed centrally. The shape factor of inside surface of a cubical body with respect to itself is

The maximum stiffness of an undamped isolator to provide 81 percent isolation for a 200kg fan operating at 1000 rotationmin is

A 500kg vehicle is mounted on springs such that its static deflection is 1.5mm. What is the damping coefficient of a viscous damper to be added to the system in parallel with the springs, such that the system is critically damped

Steam at 150 bar, 550 C is expanded in a highpressure turbine to 20 bar when it is reheated to 500 C and expanded in intermediatepressure and lowpressure turbines to condenser pressure of 0.075 bar. There are five feedwater heaters, one extraction from highpressure turbine at 50 bar, 3 from intermediate pressure turbine at 10 bar, 5 bar and 3 bar,

Air enters a duct at 20 at a rate of 0.08 ms, and is heated to 150 by steam condensing outside the duct at 200C. The error (in ) involved in calculating the rate of heat transfer to air due to using arithmetic mean temperature difference instead of logarithmic mean temperature difference is

In a countercurrent flow heat exchanger, temperature difference between hot and cold fluid at all positions is held constant. If effectiveness of the heat exchanger is 0.65 and heat capacity ratio of hot and cold fluids is 1, the number of transfer units is

The over all heat transfer coefficient based on outside surface area of a tubular heat exchanger decreased due to fouling during operation from 1000 Wm2K to 800 Wm2K. The fouling film coefficient of the heat exchanger in Wm2K is

Hot water at 95C is used in a plate heat exchanger for heating 2 kgs fruit juice from 45C to 75C. Specific heat of fruit juice is 3.7 kJkgK. Final temperature of the hot water is 70C. Overall heat transfer 22 coefficient is 1122 WmK. Heat transfer area is 12.75 m. The log mean temperature correction factor is

Two large plane surfaces are 20 mm apart and the gap contains oil of dynamic viscosity 0.6 Pa.s. A thin plate of area 0.5m is to be pulled through the gap at a constant velocity of 0.6 ms. The location of the plate will have to be such that it is 8 mm from one of is of the the surfaces. Neglecting edge effects, the force required for pulling the

A Newtonian fluid is in the clearance between a shaft and a concentric sleeve. When a force of 600N is applied to the sleeve parallel to the shaft, the sleeve attains a speed of 1ms. If a 1500N force is applied then the speed of the sleeve will be (the temperature of the sleeve remains constant)

A bush bearing of length 30cm and diameter 18.01cm supports a shaft of 18cm diameter. The shaft rotates at 36.65 radsec. The viscosity of the lubricant is 1.96 poise. The power dissipated in the bearing in kW, is (a) 9.81 (b) 7.23 (c) 14.46 (d) 3.62

The relations between shear stress (t) and velocity gradient for ideal fluids, Newtonian fluids and NonNewtonian fluids are given below. Select the correct combination.

In measuring the surface tension of oil of specific gravity 0.85 by the bubble method, a tube of internal diameter of 1.5 mm is immersed to a depth of 1.25 cm in the oil. Air is forced through the tube forming a bubble at the lower end of the tube. The surface tension of the liquid if the air pressure in the bubble is 1470 Pa is (Nm)

In figure oil of absolute viscosity u fills the small gap of thickness Y. Neglecting fluid stress exerted on the circular underside, determine the rate of heat generation in joules per second, after obtaining an expression for the torque T required to rotate the truncated cone at constant speed o. Oils absolute viscosity is 0.20 N.sm, a 45, a 45

The intensity of pressure required to suck milk by a straw through a height of 200 mm from an open vessel (Sp. Gravity of milk is 1.08) is

Q2 Identify all datums GDT tolerances. Describe its GDT meaning. 32.4 32.0 0.2 A B 38.6 38.0 04 MABM 12 0.1 12.21 0.2 THRU 0.2 MA 24 04M CABM 0.05 (M) C 0.1 2 SURFACES A 34 C 6 24 44 0.05 A 0.1 0 THRU 00.1MCFMA 58 0.6 A C DIE E 16

The barometric reading for a wall is given as 511 mmHg at the top and 528.5 mmHg at the bottom. For average air density of 1.18 kgm, the height of wall is (PHg 13600 kgm).

Arrange the pressure forces on various plates shown below in the ascending order. (All plates are touching the fluid surface).

(a) What are the main components of afterburner show the process of thrust augmentation on an enthalpyentropy plot for a turbojet engine fitted with an afterburner. 25 (b) An air breathing engine flies at Mach 2 at an altitude where the ambient temperature is 50C and the ambient pressure is 10kPa. The specific heat ratio of air is 1.4 and the

Suppose that X N(E) where 2 B (a) Let A (b) Let 1 0 0 2 1 0 3 0 0 0 1 0 and 1 132 1 1242 0124 Determine the distribution of AX (c) Find the conditional distribution of Determine Cov(AX, BX) K given that (X2, X)

A refrigeration system is operating at a cooling capacity of 10,000 W and is using R-22 as the refrigerant. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.8 MPa. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 3.2 MPa. Determine the mass flow rate of the refrigerant and the

A refrigeration system is using R-134a as the refrigerant, and the condenser is cooled by water at a temperature of 30C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 2.5 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.15 MPa. Determine the mass flow rate of the

A refrigeration system is using R-404A as the refrigerant and the evaporator is cooled by air at a temperature of -10C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 4 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.2 MPa. Determine the mass flow rate of the

An air conditioning system is using R-410A as the refrigerant and the condenser is cooled by water at a temperature of 35C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 4.5 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.25 MPa. Determine the mass flow rate of the

A refrigeration system is using R-134a as the refrigerant, and the condenser is cooled by air at a temperature of 35C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 3.2 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.15 MPa. Determine the mass flow rate of the

An air conditioning system is using R-22 as the refrigerant and the evaporator is cooled by air at a temperature of -5C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 4.5 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.2 MPa. Determine the mass flow rate of the

A refrigeration system is using R-507 as the refrigerant, and the condenser is cooled by water at a temperature of 40C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 5.5 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.15 MPa. Determine the mass flow rate of the

An air conditioning system is using R-32 as the refrigerant and the evaporator is cooled by air at a temperature of -15C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 4 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.2 MPa. Determine the mass flow rate of the

A refrigeration system is using R1234ze(E) as the refrigerant, and the condenser is cooled by water at a temperature of 35C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 3.5 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.15 MPa. Determine the mass flow rate of the

An air conditioning system is using R744 (CO2) as the refrigerant and the evaporator is cooled by air at a temperature of 10C. The refrigerant is in the vapor state at the condenser outlet, and the pressure is 4.5 MPa. The refrigerant is in the liquid state at the evaporator outlet, and the pressure is 0.2 MPa. Determine the mass flow rate of the

A steam turbine is operating at a pressure of 4 MPa and a temperature of 400C. The inlet steam mass flow rate is 10 kgs and the outlet steam mass flow rate is 9.8 kgs. Calculate the turbines power output.

A heat exchanger is used to transfer heat from a hot fluid to a cold fluid. The hot fluid has a flow rate of 5 kgs and a temperature of 200C, while the cold fluid has a flow rate of 10 kgs and a temperature of 20C. The heat exchanger is designed to transfer a maximum of 200 kW of heat. Calculate the heat exchangers effectiveness.

A gas turbine is operating at a pressure of 1 MPa and a temperature of 800C. The inlet air mass flow rate is 15 kgs and the outlet air mass flow rate is 14 kgs. The turbines power output is 50 kW. Calculate the turbines thermal efficiency.

A gas at a pressure of 2 bar and a temperature of 300 K is compressed adiabatically to a pressure of 8 bar. Determine the final temperature of the gas.

A cylinder with a piston contains 2 kg of air at a pressure of 1 MPa and a temperature of 300 K. The air is expanded adiabatically and reversibly to a final pressure of 100 kPa. Determine the final temperature and the work done by the air during the expansion.

A pistoncylinder system contains 0.1 m3 of steam at a pressure of 2 MPa and a temperature of 400C. The steam is expanded adiabatically to a final pressure of 100 kPa. Determine the final temperature and the work done by the steam during the expansion.

A cylinder with a piston contains 1.5 kg of methane gas at a pressure of 4 bar and a temperature of 280 K. The gas is compressed isothermally to a final pressure of 12 bar. Determine the final volume of the gas and the work done by the gas during the compression.

A pistoncylinder system contains 1.2 kg of water at a pressure of 5 bar and a temperature of 350 K. The water is expanded adiabatically and reversibly to a final pressure of 200 kPa. Determine the final temperature and the work done by the water during the expansion.

A cylinder with a piston contains 0.5 m3 of air at a pressure of 6 bar and a temperature of 290 K. The air is compressed isothermally to a final pressure of 20 bar. Determine the final volume of the air and the work done by the air during the compression.

A pistoncylinder system contains 2 kg of ammonia gas at a pressure of 2 MPa and a temperature of 400 K. The gas is expanded adiabatically and reversibly to a final pressure of 800 kPa. Determine the final temperature and the work done by the gas during the expansion.

A gas is at a pressure of 1 bar and a temperature of 300 K. It is then cooled at a constant pressure until the temperature reaches 273 K. How much work is done by the gas during this process?

A gas is heated from 300 K to 400 K at a constant pressure of 1 bar. How much heat is required to complete this process?

A gas is at a temperature of 300 K and a volume of 1 m3. It is then compressed at a constant temperature until the volume is reduced to 0.5 m3. How much work is done by the gas during this process

A gas is at a pressure of 2 bar and a temperature of 500 K. It is then cooled at a constant volume until the temperature reaches 300 K. How much heat is lost by the gas during this process?

A gas is at a volume of 0.5 m3 and a pressure of 3 bar. It is then expanded at a constant pressure until the volume reaches 1 m3. How much work is done by the gas on the surroundings during this process

A gas is at a temperature of 400 K and a volume of 2 m3. It is then compressed at a constant temperature until the volume is reduced to 1 m3. How much work is done by the surroundings on the gas during this process

A gas is at a pressure of 2 bar and a temperature of 600 K. It is then cooled at a constant pressure until the temperature reaches 400 K. How much heat is lost by the surroundings during this process?