AMVI Main 2011

The efficiency of a free jet striking normally on a series of flat plates mounted on the periphery of a wheel never exceeds

A jet of water 75 mm diameter having a velocity of 20 m/s strikes normally a flat smooth plate. Determine the thrust on the plate, if the plate is at rest.

Jet pumps are often used in process industry for their 

An impulse turbine

A double acting reciprocating pump with 50 rpm speed and piston having 400 mm stroke length and 0.03 m' cross-sectional area will have theoretical fluid flow of

A jet of water issues from a nozzle with a velocity of 20 m/sec and it impinges normally on a flat plate moving away from it at 10 m/sec. If cross-sectional area of jet is 0.02 m² and density of water is 1000 kg/m³, then force developed on the plate is

A fast centrifugal pump impeller will have

For small discharge at high pressure, pump preferred is

The ratio of power given to the fluid by the pump to the shaft power is called

The circuit in which hydraulic motor is located after the speed control valve is

In actual practice, one tonne of refrigeration is equivalent to 

Environmental protection agencies advise against the use of chloro-fluoro-carbon refrigerants since they react with

A machine working on a Carnot cycle operates between 305 K and 260 K. Determine the C.O.P, when it is operated as a refrigerating machine. 

In vapour compression system, the highest temperature of the refrigerant during the cycle occurs after

In aqua-ammonia and Li-Br water absorption refrigeration system, the refrigerants are respectively

In pressure enthalpy chart, space to the right of saturated liquid line represents

During humidification process, dry bulb temperature

For summer air-conditioning, the relative humidity should not be less than

The temperature of air recorded by thermometer, when it is not affected by the moisture present in it, is called

In cooling towers, the heat is dissipated mainly by