What is the critical temperature of a refrigerant ?

1198

2. Dry saturated steam at 3.5 bar is expanded through a convergent nozzle to 2.2 bar. The exit area is 5 sq. cm. Calculate the exit velocity and mass flow rate, assuming isentropic expansion and super saturated flow. b) A cast iron cylinder head is fastened to a cylinder of 750mm bore with 12 stud bolts. The maximum pressure inside the cylinder is 3 Mpa. The stiffness of part is thrice the stiffness of the bolt. What should be the initial tightening load so that the point is leak proof at maximum pressure? Also choose a suitable bolt for the above application 2 The propeller shaft of a marine engine is to transmit 600 kW at 1200 rpm, without a significant bending. The efficiency of the propeller is 88% at 32 knots ( 1 knot = 1085 km/hr). If the slenderness ratio is less than 50 and the permissible shear stress should not exceed 65 Mpa. Determine the diameter of shaft. 3 A semi-elliptic leaf spring consists of two extra full-length leaves and six graduated length leaves, including the master leaf. Each leaf is 7.2 mm thick and 65 mm wide. The centre-to-centre distance between the two eyes is 1.3m. The leaves are pre-stressed in such a way that when the load is maximum, stress induced in all leaves are equal to 380 N/mm sq. Determine the maximum force that the spring can withstand

2250

For conduction of heat, the instantaneous rate of heat flow is product of three factors. What are these ?

951

In terms of electrical enhineering, give a detailed explanation of the "earth fault loop path"

2359

how material removal occurs only in workpiece not in tool during an EDM process?

1974

Sir/Mam, I have applied for RRB chennai for the section engineer - mechanical posting. If any one is having the old written exam question papers please send it to my mail id : spramu@gmail.com Thanks in advance, Ramanathan...

1989

What is meant by counter flow heat exchanger?

1159

What will cause if you run your engine in critical RPM continuously?

2291

i need rrb chennai JE mechanical last 2 year question papers Plz send me on this email id aaasaravanan@gmail.com

2266

What is big advantage of fast breeder reactor ?

1098

dear sir i want also last five year rrb chandigarh and allahabad aptitude test question and their answered my id is anshuldhiman83@gmail.com

1865

Causes of M/E high exhaust valve temperature

1940

What is the effect of addition of zinc in copper? What is the use of 70/30 brass ?

1086

What causes crankcase explosion?

2443

Why efficiency of gas turbines is lower compared to i.c. Engines ?

1105