ISRO Scientist or Engineer Mechanical 2009
For the following questions answer them individually
The transition Reynolds number for flow over a flat plate is $$ 5 * 10^5.$$ What is the distance from the leading edge at which transition will occur for flow of water with a uniform velocity of 1m/s? (For water, the kinematic viscosity, $$v = 0.86 * 10^{-6} m^2/s)$$
For a reciprocating water pump having cylinder dia d and crank radius r, if W is the weight of water lifted, the coefficient of discharge is
Both free vortex and forced vortex can be expressed mathematically in terms of tangential velocity V at the corresponding radius r. Choose the correct combination
A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will
A single-stage impulse turbine with a diameter of 120 cm runs at 3000 rpm. If the blade speed ratio is 0.42, then, the inlet velocity of steam will be
The critical point and triple point data for water are, $$T_c = 374^\circ C, P_c = 22.1 Mpa, T_T = 0.01^\circ C, P_T = 0.6 kPa$$ Indicate the phase change that will occur in following cases,
(i)Ice at 0.5 kPa is heated isobarically
(ii) Water vapour at $$400^\circ C$$ is compressed isothermally
The ratio of specific heats of a gas is 1.4 and the value of specific heat at constant pressure is $$7.0 cal/mole^\circ C$$. The difference between specific heat at constant pressure and specific heat at constant volume will be $$(in cal /mole^\circ C)$$
The coefficient of linear expansion of a solid is L. The volume V of a cube of this solid on being heated by $$1^\circ C$$ will change by
Two springs of equal length but having stiffness of 10 N/mm and 15 N/mm support a mass of 2 tonnes in series. Find the frequency of vibration
