Engineering Services Exam- Mechanical Engineering Set 4

A centrifugal pump is required to lift 0.0125 m3 /s of water from a well with depth 30 m. If rating of the pump motor is 5 kW, and the density of water is 1000 kg/m 3 , the efficiency of the pump will be nearly

An inward flow reaction turbine has an external diameter of 1 m and its breadth at inlet is 250 mm. If the velocity of flow at inlet is 2 m/s and 10% of the area of flow is blocked by blade thickness, the weight of water passing through the turbine will be nearly

The process of abstracting steam at a certain section of the turbine and subsequently using it for heating feed water supplied to the boiler is called

When blade speed ratio is zero, no work is done because the distance travelled by the blade is zero even if the torque on the blade

Which of the following are essential for a good combustion chamber of turbojet engine?
1. It should allow complete combustion of fuel.
2. It should maintain sufficiently high temperature in the zone of combustion in addition to proper atomization of fuel thus leading to continuous combustion.
3. It should not have high rate of combustion.
4. The pressure drop should be as small as possible

If mf is the mass of fuel supplied per kg of air in one second, then the mass of gases leaving the nozzle of turbojet will be

Which one of the following may be considered as a single cylinder two-stroke reciprocating engine running at 2400 rpm to 2700 rpm for rapid chain of impulses?

0.8 kg of air flows through a compressor under steady state conditions. The properties of air at entry are : pressure 1 bar, velocity 10 m/s, specific volume 0.95 m3 /kg and internal energy 30 kJ/kg. The corresponding values at exit are 8 bar, 6 m/s, 0.2 m 3 /kg and 124 kJ/kg. Neglecting change in potential energy, the power input will be