Define the following terms,
(i) specific work transfer
(ii) specific air consumption
(iii) work ratio
(iv) swept volume
b. DerivetheformulaforthemeaneffectivepressureoftheOttocycle
c. An engine of 200 mm bore and 315 mm stroke works on Otto Cycle. The clearance is
3O
0.00251 m . The initial pressure and temperature are 1 bar and 65 C. If the maximum
pressure is limited to 35 bar, calculate the following,
(i) The air standard efficiency of the cycle
(ii) The mean effective pressure for the cycle

A power station uses Diesel as fuel (C12H26), from the analysis of combustion gases, it's obtain that 30% of carbon is converted to CO and the rest to CO2.

Furthermore, the gases in the exhaust have a temperature of 450 K. with this information:

a) mass air-fuel ratio: In Kgair/Kgfuel

b) Theoric air percentage: %

c) Moles of water steam produced in the reaction: in kmol

d)"wasted" heat in the gases on the steam exhaust, if you consider that the ideal exit temprature of the combustion gases should be of 380K: in kJ/kg

i need summary between (4-10) pages about ((Control circuit refrigeration system in airplanes)) with name of the references in end page

Two equal gear wheel of 360 mm p.c.d and 6 module are in mesh if the pressure angle 20 determine the maximum addendum necessary if there are always to be at least two pairs of teeth in contact . if the gear wheels rorates at 110 r.p.m and 6 kw is being transmetted find the normal force between the teeth assuming that the total force is dividing equally between the two pairs of teeth Neglect the frection. (Ans 6.8mm , 1.54KN .)

Briefly describe (with the use of diagrams) the Brayton’s cycle and derive the formula for
the coefficient of performance for the Brayton’s cycl

A house that is losing heat to the 100C outdoors at an average rate of 50,000 kJ/h is maintained at 220C at all
times during a winter night for 10 h. The house is to be heated by 50 glass containers each containing 20 L
(1L=10-3 m3
) of water that is heated to 80oC during the day by a solar heater. A thermostat-controlled 15-kW
back-up electric resistance heater turns on whenever necessary to keep the house at 220C. Analyse and
determine the following:
i. If the average solar intensity is 650 W/m2

and the solar heater has an efficiency of 80%, calculate the

area of solar heater to heat 20L of water from 220C to 800C in 8 hours.
ii. How long did the electric heating system run at night?
iii. Keeping 2nd law of thermodynamics in mind, what is the maximum efficiency of the back-up heater?
iv. If the heat provided by the back-up heater is provided using Carnot heat pump, determine the
reduction in electricity consumption.

Derive the general energy equation for the following systems using appropriate diagrams,
(i) Internal combustion engine
(ii) Steam turbine
(iii) Boiler
(iv) Compressor

A machine is out of order for minor work. Define controls
exercised in maintenance. Department required for its maintenance.

ppt presentation on "Lifting Hazards"

1. a Describe briefly the main cost headings associated with achieving high quality and reliability, and the main consequential costs of failure, in development, production and use.

b Explain and discuss Deming’s philosophy of overall quality and reliability cost minimization.

Obtain the initial and residual shock spectra of a half sine pulse. What is the total shock spectrum?

need a presentation on "Lifting Hazards"

Heat transfer question

A shell-and-tube heat exchanger is used to heat a liquid that flows in tubes of inside and outside diameters Di=10 mm and Do=11 mm. You have been asked to choose the most cost-efficient material for the tubes. Material A has a density ρA=8900 kg/m³ and a thermal conductivity kA= 10 W/m·K. Material B has a density ρB=1780 kg/m³ and a thermal conductivity kB=0.17 W/m·K. The cost of material A per unit mass is three times the cost of material B. Determine which is most cost-efficient by:

a) Calculating the ratio of material B to material A surface area needed for the same heat transfer rate.
b) Determining the ratio of the mass of material B to material A.
c) Finding the cost ratio of the mass of material B to material A.


The inner and outer heat transfer coefficients are hi= 1000 W/m²-K and ho=200 W/m²-K, respectively.

1. Find the inside convective resistance, in K·m/W.

List the operating procedure to put the differential pressure transmitter into service and put it out of service with suitable diagram.