Mechanical Engineering Questions and Answers June 14, 2021

A gas is at a volume of 0.5 m^3 and a temperature of 500 K. It is then expanded at a constant temperature until the volume reaches 1 m^3. How much heat is gained by the surroundings during this process?

A gas is at a pressure of 1.5 bar and a temperature of 600 K. It is then cooled at a constant volume until the temperature reaches 400 K. How much work is done by the gas on the surroundings during this process?

A heat exchanger is used to transfer heat from a hot fluid to a cold fluid. The hot fluid enters the heat exchanger at a temperature of 80C and a mass flow rate of 0.5 kgs. The cold fluid enters the heat exchanger at a temperature of 20C and a mass flow rate of 1 kgs. The heat exchanger is designed to transfer a maximum of 400 kJs of heat to the

A gas is compressed isothermally from a volume of 0.03 m3 to a volume of 0.02 m3. The initial temperature is 300 K and the initial pressure is 1 bar. Determine the final temperature and pressure of the gas.

A gas is expanded adiabatically from a pressure of 2 bar and a temperature of 400 K to a pressure of 1 bar. Determine the final temperature and volume of the gas.

A gas turbine is used to generate electricity. The turbine inlet temperature is 800 K and the turbine outlet temperature is 400 K. The turbine is designed to generate 50 kW of power. Determine the thermal efficiency of the turbine.

A heat pump is used to transfer heat from a cold reservoir at -10C to a warm reservoir at 30C. The heat pump has a coefficient of performance of 5. Determine the heat transferred to the warm reservoir.

A steam turbine is operating at a steady state with a mass flow rate of 8 kg/s and an inlet temperature of 400C. The outlet temperature is 100C and the specific enthalpy at the inlet is 3500 kJ/kg. Determine the thermal efficiency of the turbine.

A heat exchanger is used to transfer heat from a hot fluid to a cold fluid. The hot fluid enters the heat exchanger at a temperature of 70C and a mass flow rate of 0.8 kgs. The cold fluid enters the heat exchanger at a temperature of 10C and a mass flow rate of 1.2 kgs. The heat exchanger is designed to transfer a maximum of 800 kJs of heat to the

A steam turbine is operating at a steady state with a mass flow rate of 5 kg/s and an inlet temperature of 300C. The outlet temperature is 100C and the specific enthalpy at the inlet is 3200 kJ/kg. Determine the net power output of the turbine.

A closed system containing 10 kg of water is heated by a steady stream of hot water at 80C. The water in the closed system is at a temperature of 60C and a pressure of 1 MPa. Determine the amount of heat transferred to the closed system.

A gas is heated at constant pressure in a piston-cylinder assembly. The initial volume is 0.05 m3 and the initial temperature is 300 K. The final temperature is 600 K. Determine the final volume of the gas.

A refrigerator is used to cool a room from 27C to 22C. The heat removed from the room is 1.5 kJ/s. The refrigerator has a coefficient of performance (COP) of 3. Determine the power input to the refrigerator.

A steam boiler is used to generate steam at a pressure of 5 bar and a temperature of 350C. The steam is used to drive a turbine, which generates electricity. The steam exits the turbine at a pressure of 0.1 bar and a temperature of 150C. Determine the thermal efficiency of the steam turbine.

A gas turbine is used to generate electricity. The turbine inlet temperature is 1200 K and the turbine outlet temperature is 600 K. The turbine is designed to generate 100 kW of power. Determine the amount of fuel used by the turbine.

An air compressor is used to compress air from 1 bar and 20C to 10 bar and 50C. Determine the power input to the compressor.

A heat pump is used to transfer heat from a cold reservoir at -20C to a warm reservoir at 50C. The heat pump has a coefficient of performance of 4. Determine the power input to the heat pump.

A block of mass m = 10 kg is placed on a horizontal surface and is pulled by a force F = 20 N. The coefficient of static friction between the block and the surface is s = 0.5. Determine the maximum force that can be applied to the block before it starts to move.

A block of mass m = 20 kg is placed on a horizontal surface and is pulled by a force F = 50 N. The coefficient of kinetic friction between the block and the surface is k = 0.2. Determine the force required to keep the block moving at a constant velocity

A block of mass m = 15 kg is placed on an inclined plane with an angle of inclination of = 30 degrees. The coefficient of static friction between the block and the plane is s = 0.4. Determine the minimum force required to keep the block from sliding down the plane.

Calculate the shipping cost of a Flat Screen TV given the information provided below. Each TV is 41(1) x 8(w) x 28 (h) and cannot be laid flat in shipping (i.e., this end up) You must palletize all TVs on standard size pallets 40 x 48 x 2 Due to loading limitations of the TVs, you can load five high The trailer is NOT equipped with shelves to

If r 7r 2y and y 2x 7y for some numbers and y with y, then what is 2 y2 4

Question:-____ Which statement is true about the fracturing of glass? a. Concentric fractures form first on the same side as the destructive force b. Radial cracks form afterwards, starting on the same side as the destructive force c. Radial cracks and concentric fractures are formed simultaneously d. Radial cracks appear first starting on the

Question:- PLC software that runs on a personal computer can be used to a) write a PLC program. b) document a PLC program. c) monitor the control process. d) all of the above 2. A control management PLC application normally requires a a) micro-size PLC. b) small-size PLC. c) medium-size PLC. d) large-size PLC.

Which of the following is not true about VOIP? a) It stands for Voice Over Internet Possibility b) It uses digital, not analog, signals. c) It can transmit both voice and video. d) It uses the Internet, rather than regular phone lines or your cellular network.

Flatbed and document are types of: a. headsets b. MaxiCode c. monitors d. scanners Device used by banks to automatically read those unusual numbers on the bottom of checks and deposit slips. a. MICR b. FDIC c. OMR d. UPC

Eliza has 300 of income. The price of pears is 2 each. The price of almonds is 1 each. Show her budget constraint. What is the opportunity cost of pears in terms of almonds 2. Kit has income of 1,000. (a) Sketch Kits budget line if the price of muffins is 5 and the price of cookies is 10. (b) What is the slope of this budget constraint (c) What is

3.21. A series of calibration tests is conducted on a pressure gage. At a known pres sure of 1000 psia it is found that 30 percent of the readings are within 1 psia of the true value. At a known pressure of 500 psia, 40 percent of the readings are within 1 psia. At a pressure of 200 psia, 45 percent of the readings are within 1 psia. What

Let us consider a two-link robotic device as a double pendulum undergoing 2-D motion in a gravity field g. The coordinates 1 and 2 describe the orientation of the bars, with 1 and 2 being positive for counterclockwise rotations from vertical. Use Lagrange's method to find the EOM's of the system using the generalized coordinates of 1 and 2 .

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D 10 in. 80 lbft A 40 lbft 10 in. 30 in. 12 in. 4 in. F 6 in. B Shafts G1110psi, diameter d1in A,B,C bearings, free rotation D fixed support Angle of twist at B a) Sketch FBD of AB, determine the torque from F to E b) Use gear ratio, determine the toque from E to F. c) Section method Cut between H and F, FBD from the cut to F, internal toque FBD

Captain Americas best friend, Bucky Barnes, suffered a traumatic fall from a train and lost his arm. The arm was replaced with a bionic arm, and Bucky was brainwashed into being an evil super soldier. Clearly, there was a lot of oversight by biomaterials experts on the design of Buckys bionic prosthetic arm! Lets see if we can understand a little

Synthetic Muscle Tres jorrer Intrastatas, Sa Synthetic le created to appert metal am, Acts and beves just 1 cle but re urbis to deal with the amounts of face sutput by said an (compared to les). Metal Dones and shoulders placed for with tall added support. Possibly out of catal ac art tar cacing. wallow to decrease weight.

Given A structure is made up of members AC and CE. CE is fixed to ground at end E, whereas AC is pinned to CE at C and has end A constrained to move along a smooth incline at its left end. Find Determine the reactions on member AC at A and the reactions on CE at E. For this problem, use the following parameters 0 30, d 2 ft, F 30 kips and P 10

A weight is tied to a rope that is wrapped around a pulley as seen in the diagram above. The pulley is initially rotating in a counterclockwise (out of the page vector direction) fashion so that the weight is initially moving vertically upwards. The weight is providing the only torque on the pulley seen in the diagram. The weight slows down while

The flow of an incompressible fluid is defined by u=2, v=8x. Does a stream function exist? If so, find its expression.

An axial tension load on a bolt is 10 kN and a transverse shear force is 5 kN. Find the size of the bolt by using maximum shear stress theory (MSS). The maximum tensile yield of the material is 100 MPa.

The permissible shear stress for the weldment in Figure is 172.7 MPa. Estimate the second polar moment of area. Take F 26.0 kN, a 132 mm and h 9 mm. Give your answer in mm. Work to 3 decimal places. Do not submit the answer with units. h a h 180 mm L 150 mm

A 15 cm diameter piston is located within a which is connected to 1.3 cm diameter inclined tube manometer as shown cylinder in figure below. The fluid in the cylinder and the manometer is SAE 30 oil (specific 8.95 kNm). If a weight W is weight ,placed on the piston head, the fluid level in the manometer tube rises from point (A) to point (B), what

Multiplexer is a combinational circuit that has maximum of 2 data inputs, n selection lines and single output line. One of these data inputs will be connected to the output based on the values of selection lines. Since there are n selection lines, there will be 2 possible combinations of zeros and ones. So, each combination will select only one

A 120 cm long with diameter of 1 cm is subjected to pull of 20,000 N.If modulus of elasticity(E) = 2 x 10 5 N/mm 2 .Determine: 1.Stress 2.Strain 3.Elongation of rod

In a bank, deposits can be made for periods ranging from 6 months to 10 years. Every quarter, an interest will be added on to the principal. The rate of interest applied is 9 per annum for periods from 12 months to 23 months and 10 per annum for periods from 24 months to 120 months. An amount of 1,000 invested for 2 years to grow, will be nearly

An oil cooler in a high-performance engine has an outside surface area 0.12 m 2 and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m 2 K. Find out the heat transfer rate? a) 564.98 W b)

Which of the following is a dominance of power screw? a) Large load carrying capacity b) High efficiency c) Wear of screw is reduced d) Mechanical advantage is lowered

Find minimum diameter of wire(Steel) used to raise a load of 4 KN,if maximum stress of the rod is 95 MN/m 2 .

Give an example of a subset C of R which contains no open interval and is not dense in any interval containing itself, but yet is uncountable.

Show that a) a bounded, monotonia real sequence converges b) the geometric series 00 i0 i a converges if a 1. PROBLEM 1

Show that a sequence of realvalued functions f, defined on complete metric space X, is uniformly convergent if and only if for every 0 there exists an integer N such that m, nN, t EX implies f(t)f(t) . (This is known as the Cauchy condition.)

A uniform bar of mass m is pivoted at point O and supported at the ends by two springs, and damper at middle, as shown. End P of spring PQ is subjected to a sinusoidal force F Fo cos wot. If it given that 1zm, kykNm, c 100 N.sm, m 3(x) kg, wo 20 rads and Fo 100(x) N. (if z 0, use l 1 m) i. Drive the differential equation that describes the

Describe how to determine if a product is a combination or non-combination product and the process you would go through to determine what a company should focus on during the approval phase.

An engineer has a DAQ with a 14bit AD converter and a voltage range of 0 to 10 V. They are measuring vibrations around 20 Hz, so they sample at f 100 Hz to avoid aliasing. They add a DC offset of 5 V to the signal so that the periodic components due to vibration are centered within the range of the DAQ. a) Calculate the quantization error of this

Water flows through a horizontal pipe that has a diameter of 20 cm. The pipe is connected to a vertical section of the same diameter, which rises to a height of 5 m. If the water flow rate through the pipe is 0.02 m^3/s, calculate the pressure difference between the top and bottom of the vertical section.

A cylinder contains 5 m 3 of an ideal gas at a pressure of 1 bar. This gas is compressed in a reversible isothermal process till its pressure increases to 5 bar. The work required for this process is

For a circular column having its ends hinged, the slenderness ratio is 160. The l/d ratio of the column is

A rigid bar AC is supported by three rods of same material and of equal diameter. The bar AC is initially horizontal and a force (P = 10 kN) is applied such that the bar AC continues to remain horizontal. Force in the longer bar is

A rigid bar AC is supported by three rods of same material and of equal diameter. The bar AC is initially horizontal and a force (P 10 kN) is applied such that the bar AC continues to remain horizontal. Force in the longer bar is L (4) A a (2) a P10 KN T (3) L 2L

If the peripheral speed of a grinding wheel of 100 mm diameter for cylindrical grinding of a steel workpiece is 30 m/s, then the estimated rotational speed of the grinding wheel in revolution per minute will be

What is the rotation matrix for a rotation of 30 about the OZ axis, followed by a rota tion of 60 about the OX axis, followed by a rotation of 90 about the OY axis 2.2 What is the rotation matrix for a rotation of angle about the OX axis, followed by a rotation of angle about the OW axis, followed by a rotation of angle about the OY axis 2.3 Find

In a 3 stage compressor with perfect intercooling between the stages, the suction pressure is 3 bar while the delivery pressure is 81 bar. The ratio of second intermediate pressure and suction pressure is

0.04 kg of CO (M = 44) is compressed from 1 bar, 20 0 c , until the pressure is 9 bar and the volume is then 0.003 m 3 . Calculate the change of entropy. Take C p for CO 2 as 0.88 kJ/K and assume CO 2 to be a perfect gas.

What is a combustion chamber? b)Write the steps followed in the design of a combustion chamber are as follows?

A venturimeter with a throat diameter 115mm is fitted in a vertical pipeline of 275 mm diameter with water flowing upward at the rate of 0.085m ^ 3 / s Two pressure gauges are fitted at tapping points, one at the throat and the other in the pipe inlet. The pressure between the two gauge pressure readings is 45kN / (m ^ 2) Determine the distance

Application of Bernoulli's Equation 1. A pipe AB carries water and tapers uniformly from a diameter 0.7 m at A to 0.3 m at B over a length of 4 m. Pressure gauges are installed at A and B. If the centreline is horizontal and pressures recorded at A and B are 400 kPa and 370 kPa, respectively, determine the flow through the pipe. Neglect all

Calculate the pH of a 0.40M ammonia solution? Show how the concentrations of the pertinent species change. (Kb=1.85x10^-5)

In a test on 2000 electric bulbs, it was found that the life of a particular make was normally distributed with an average life of 2040 hos S.D of bohos Estimate the ne of likely to burn for it more than 2150hrs. ii) Less than 1950 hrs. ilik more than 1920 hrs but less than 2160hrs.

Which of the following are the most likely characteristics in centrifugal casting (a) Fine grain size and high porosity. (b) Coarse gain size and high porosity. (c) Fine grain size and high density. (d) Coarse grain size a high density.

A side riser is to be designed for a hollow cylindrical casting of 50 mm inside diameter and 100 mm outside diameter. If the length of cylinder is 50 mm, the diameter of riser in mm is

A plate of 17mm thickness and 500mm length is to be produced by providing n no. of risers with adequate capacity and equal spacing. The number of risers n and the condition of usage of risers to produce plate is (a) Three risers with end chills (b) Two risers with end chills (c) Three risers with end and central chill (d) Two risers with end and

Misrun is the defect produced in casting process due to the solidification that s before complete filling of the casting cavity. starts This defect can be eliminated by (a) Increasing the pouring of molten metal into the casting cavity (b) Providing high thermal conductivity metal pieces at the corners (c) Increasing degree of superheat of molten

in a A 50 mm square hole is to be produced casting of length 300 mm. The density of core used is 4.5 gcc and density of molten metal used during casting process is 8 gcc. If the surface area of the core print used is 0.05m, the cross sectional area of the chaplet used is (a) 240 mm 2 (c) 746 mm (b) 507 mm (d) zero

Which of the following statements are INCORRECT In casting process 1. Strainer is used for filtering impurities present in molten metal. 2. Skim bob is used to avoid sand erosion during poring of molten metal 3. Riser is used for compensating solid shrinkage during solidification. 4. Straight tapered circular cross section sprue is used to avoid

Steam flows adiabatically at a rate m 0.01 kgs through a diffuser, shown in Figure 2.2, with inlet diameter D 1.0 cm. Specific volume at the inlet v 2.40 mkg. Exit diameter is D 2.5 cm, with specific volume at the outlet v 3.80 mkg. Find the change in enthalpy neglecting any change in the potential energy. V 1 2

Steam at p16000 kPa and T1 400C expands reversibly and adiabatically through a steam turbine to pressure p2 60 kPa. (a) Find the exit quality and (b) the work delivered if the change in kinetic energy is neglected.

Explain the working principles of the three advanced machining processes falling under each of the following subcategories with the help of schematic diagrams in detail. (a) Mechanical Advanced Machining Processes (b) Thermoelectric Advanced Machining Processes (c) Electrochemical and Chemical Advanced Machining Processes

Which are different processing parameters that govern Material Removal Rate (MRR) of the following advanced machining processes Explain three parameters in detail with the help of figures for each process. i. Abrasive Jet Machining (AJM) ii. Ultrasonic Machining (USM) iii. iv. Electric Discharge Machining (EDM) Laser Beam Machining (LBM) V.

Describe in detail, how following LASER Lights are produced with the help of figures. (a) Solidstate LASER (b) Gas LASER

Using Ultrasonic Machining process, a cylindrical impression of 10 mm diameter and 1 mm deep is to be made on a WC specimen. Feed force is constant, and is 5 N. Average diameter of grains in the slurry is 10 m. Tool oscillates with the amplitude of 30 m at 20 kHz. Abrasive and water ratio in the slurry is 1. Fracture hardness of WC workpiece may

Describe the working of any of the two processes falling under each of the following classes of Additive Manufacturing Processes with the help of schematic diagrams. (a) Liquidbased processes (b) Powderbased processes (c) Depositionbased processes (or Solidbased processes)

How material utilization is calculated

Show a strip layout where processing is possible by single pass as well as two pass method.

Write a short mote on cher applied on die and punches.

What is Spring back effect

with Sketches explain the methods used to tackle Spring back.

What is Air bending

How Do You Calauate deep drawing Force

Use the gold section method to determine (with Find the optimum solution to the following problem Maximise x 2x in following interval (3,5)

use the method of steepest descent to approximate the optimal solution to the problem Maximize (x2) x x 1 from point. perfrom 3 iterations stinding

If the population Size 6 f1, t 2 f33, fy4, f55 fe 6 bow 1 many times is the indivudial with f4 likely to be picked by fitness pso potioral selection in a single generation.

Consider the following solutions to the optimization problem solved by using Genetic algorithm (GA). Pagord 1 1 2 3 Parent 2 4 5 C 3 346 2 7 1 5 Generate offspring by performing using any e soss over operator. a crossover operation.

Maximise the function f(x) x3 60x2 900 x 100 using Siroulated Annealing Perform 3 iterations at poviticulo temperature and illustrate with two temperature re ductions. .

A belt runs over a pulley of 800mm diameter at a speed of 180 rpm. The angle of lap is 165 degrees and the maximum tension in the belt is 2 kN. Determine the power transmitted if the coefficient of friction between the belt and the pulley is 0.3.

A pump is used to transfer water from a lower level reservoir to a higher level tank. The pump has a flow rate of 500 liters per minute and is powered by an electric motor that operates at 90% efficiency. The total height difference between the reservoir and the tank is 30 meters, and the water density is 1000 kg/m^3. What is the power input

In electrochemical machining of pure iron a material removal rate of 600 mm 3 /min is required. Estimate current requirement

Composition of a Nickel superalloy is as follows: Ni = 70.0%, Cr = 20.0%, Fe = 5.0% and rest Titanium Calculate rate of dissolution if the area of the tool is 1500 mm2 and a current of 2000 A is being passed through the cell. Assume dissolution to take place at lowest valency of the elements. ANi = 58.71 Ni = 8.9 Ni = 2 ACr = 51.99 Cr = 7.19 Cr =

In ECM operation of pure iron an equilibrium gap of 2 mm is to be kept. Determine supply voltage, if the total overvoltage is 2.5 V. The resistivity of the electrolyte is 50-mm and the set feed rate is 0.25 mm/min

Am aluminum thinwalled tube (radiusthickness 20) is closed at each end and pressurized to 1600 7MPa to cause plastic deformation. Neglect the elastic strain and find the plastic strain in the circumferential (hoop) direction of the tube. The plastic stressstrain curve is given by 170(E) 0.25, where stress is in 2 MPa.

Determine the position at which a ball thrown up to the right will strike the in clined surface shown in Fig. 8.12. The ini tial velocity of the ball is 30 msec. inclined at 60, to the horizontal.

A mine cage weighs 12 kN and can carry a maximum load of 24 kN. The average fric tional resistance of the slide guys is 600 N What constant cable tension is required to give a loaded cage an upward velocity of 3 msec, from rest in a distance of 3 m

A small steel ball is shot vertically upwards from the top of building 50 m above the street with an initial velocity of 25 msec. (a) In what time, it will reach the maximum height (b) How high above the building will the ball rise (c) Compute the velocity with which it will strike the street and the total time for which the ball is in motion

The price goes up, it goes downall around the town. Sorry. Hindsight, they say, is 20/20. So, in retrospect, it is not so surprising that the boom in real estate prices of just a few years ago was followed by a painful collapse. Encouraged by low interest rates and a willingness of banks to lend money to almost anybody, many people had jumped into