SSC JE Mechanical Engineering 25th May 2014 Shift-2

In a reaction turbine, the heat drop in fixed bladeis 8 kJ/kg and total heat drop per stage is 20 kJ/kg. The degreeof reaction is

A closed balloon containing 10 kg of helium receives 5 kJ/kg of heat. During this process, the volume of the balloon slowly increases by 0.2 m$$^3$$ at constant pressure of 100 kPa. The changein internal energy,in kJ, is

A gas in a container A is in thermal equilibrium with anothergas of the same mass in container B. If the corresponding pressures and volumes are denoted by suffixes A and B, then which of the following statements is true ?

A liquid flows from low level $$Z_1$$, pressure $$P_1$$, to a higher level $$Z_2$$, pressure $$P_2$$. It can be concluded

The food compartment of a refrigerator is maintained at $$4^\circ C$$ by removing heatfrom it at a rate of 360 kJ/min. If the required power input to the refrigerator is 2 kW, the COP of the refrigerator is

For a 4-stroke diesel engine, the compression ratio is 21 : 1 and the cut-off ratio is 2: 1. What is its expansion ratio ?

A ball is dropped vertically downwards, it hits the floor with a velocity of 9 m/s and bounces to a distance of 1.2 m.Coefficient of restitution between the floor and the ball is

For a material with Poisson’s ratio 0.25, the ratio of modulus of rigidity to modulus of elasticity will be

If equal and opposite forces applied to a body tend to elongate it, then the stress produced is

What type of contact occurs during meshing of helical gears ?