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