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A refrigerator is maintained at 4˚C by removing heat from it at a rate of 8 kW. If the required power input to the refrigerator is 2.5 KW, determine (a) the COPR and (b) the rate of heat rejection to the room that houses the refrigerator
a) Define Maintainability and availability and compare it with reliability.
b) What is inspection and repair availability model? Explain a case for it.
Perform a qualitative analysis on the following fault tree by expressing the top event in terms of non-reductant basic events using Boolean algebra. If the probability of each basic event is 0.005 and events are independent, what is the probability of the top event?
Find out the reliability using markov analysis for load sharing units?
(b) A manufacturing company operates two production lines when both lines are operating, the production rate on each line is 500 units per hour. At this production rate the failure rate of line 1 is 3 failures per 8-hr day (CFR) and the failure rate of line 2 is 2 failures per 8-hr day. When one line fails, the production rate of the second line must be increased in order to make production quotas. At the increased rate of 800 units per hour, the failure rate of line 1 is 6 per 8 hr day and the failure rate of line is 3 per 8-hr day. Find the reliability and the MTTF and the reliability of the production system over a 1 hr and over an 8 hr production run.
Perform a qualitative analysis on the following fault tree by expressing the top event in terms of non-reductant basic events using Boolean algebra. If the probability of each basic event is 0.005 and events are independent, what is the probability of the top event?
(b) Given a budget of Rs. 700 and the following data on three components that must operate in series .Determine, using marginal analysis, the optimum number of redundant units. Compute the achieved reliability.
Superheated water vapor in a piston-cylinder is cooled at 200 kPa, 300°C is cooled at constant pressure until 70% of it condenses. Determined the work done during this process.
a shaft fitted with a fly wheel rotates at 250 rpm and dried a machine the torque of machine varies in a cyclic manner over a period of 3 revolution. The torque rises from 750 Nm to 300Nm uniformly during half revolution and remains constant for the following revolution . If then fall uniformly to 750 Nm during the next half revolution and remains constant for one revolution the cycle being repeated thereafter. Determine the power required to drive the machine and percentage fluctuation in speed if the driving torque applied to the shaft is constant band and mass of the fly wheel is 500 kg with the radius of gyration at 600mm.
A single cylinder single acting four stroke cycle gas engine develops 22 kw at 300 rpm the fly wheel mass is 100kg hoop stress developed is 5 Mpa density of material of rim of fly wheel is 800Kg/m 3.The speed variation on the either side is 1% of mean speed. Determine the ratio of work done during expansion and compression strokes work done in suction and exhaust stroke is negligible.
a horizontal gas engine running at 210 rpm has a bore of 220mm and stroke of 440mm. The connecting rod is 924mm long the reciprocating parts weighs 20kg when the crank has turned to the angle of 30° from IDC . The Gas pressure and the cover and the crank sights are 500KN/m2 and 60KN/m2 respectively .Diameter of the piston rod is 40mm
i) Turning moment on the crank shaft
ii) Thrust on Bearing
iii) Acceleration of the flywheel which has a mass of 8kg and radius of gyration of 600mm while the power of the engine 22kw
A pressure cooker has 1.0 kg of steam 0.8 dry at 3.0 bar. What amount of heat needs to be supplied
to raise its pressure to 4.0 bar?
