Mechanical Engineering Answers

Two systems have the following equations of state and are contained in a closed cylinder, separated by a fixed, adiabatic and impermeable piston. N1=2, N2=1.5
. The initial temperatures are T1 = 175 K and T2 = 400 K. The total volume is 0.025 m^3
. The piston is allowed to move and heat transfer is allowed across the piston. Determine the final temperature of the system (in Kelvin).
1/T1=3/2(R*N1/U1) , P1/T1=R*N1/V1
1/T2=5/2(R*N2/U2) , P2/T2=R*N2/V2

Calculate the value of the translational partition function of O2 at 1000 K for a volume of 1 m3. Submit your answer multiplied by 10−32 (i.e. if you calculate 4.2e33, input 42).

A rotor is driven by a co-axial motor through a single plate clutch,both sides of the plate being effective.The external and internal diameters of the plate are respectively 220 mm and 160 mm and the total spring load pressing the plates together is 570 N.The motor armature and shaft has mass of 800 kg with an effective radius of gyration of 200 mm.The rotor has a mass of 1300 kg with an effective radius of gyration of 180 mm.The co-efficient of friction for the clutch is 0.35.The driving motor is brought up to a speed of 1250 r.p.m. when the current is switched off and the clutch suddenly engaged. 1.The final speed of the motor and rotor is....... QUESTION 2.The time to reach this speed is .....QUESTION 3.The kinetic energy lost during the period of slipping is

A rotor is driven by a co-axial motor through a single plate clutch,both sides of the plate being effective.The external and internal diameters of the plate are respectively 220 mm and 160 mm and the total spring load pressing the plates together is 570 N.The motor armature and shaft has mass of 800 kg with an effective radius of gyration of 200 mm.The rotor has a mass of 1300 kg with an effective radius of gyration of 180 mm.The co-efficient of friction for the clutch is 0.35.The driving motor is brought up to a speed of 1250 r.p.m. when the current is switched off and the clutch suddenly engaged.QUESTION 1.The final speed of the motor and rotor

An accelerometer is measuring a structure as described below: Damping ratio of accelerometer = 0.65 Highest frequency measured by the accelerometer = 6000 hz Natural frequency of the accelerometer = 18000 hz What is the percentage error in the accelerometer at the highest frequency it can measure? (Type in a two-decimal number that represents a percentage)

For the solid steel shaft shown (G = '77 GPa}, determine the “v angle of twist at A. (b) Solve part (a), assuming that the steel shaft is hollow with a 30-mm enter diameter and a 20-mm inner diameter.

Calculate the volume of a parallelopiped whose vertices are given by (0,0,0),
(2,1,3),(3,2,4) and (4,2,1).

an isa 200×100×10 angle is welded to steel plate by means of fillet welds the angle is subjected to static force of 150 kN and the permissible shear stress for the weld is70kN. determine length of welds at top and bottom .l1=100mm,and l2=200mm

To transmit 75 kW at 25 rev/s using 48 mm diameter shafting. The flanges are to be made of cast iron and keyed to the shafts, and power is transmitted from one flange to the other by a circle of fitted bolts (four are shown in the above figure but more or less bolts can be used). The adopted bolts must comply to the following technical specification: Property Class Designation: 4.6

Nominal size range: M5 – M100 (Sizes M5 to M45 are commonly used in construction)

Material and Treatment: Low or medium carbon steel

Tensile Ultimate Strength, 400MPa, Minimum.

Tensile Yield Strength, 240MPa, Minimum.

CALCULATE THE FOLLOWING

Key analysis,

Hub analysis

Flange (web) analysis

Bolt analysis.

An air refrigerator works between the pressure limits of 1 bar and 5 bar. The temperature of air entering the compressor and expansion cylinder are 10oC and 25oC respectively. The expansion and compression follow the law pv1.3=constant. Find the following