Mechanical Engineering Test Preparations On Steam Boilers and Engines Part 2

Test Preparation on Mechanical Engineering Test Preparations On Steam Boilers and Engines Part 2

1.

Besides mean effective pressure, the data required to determine the indicated power of an engine include

1piston diameter, length of stroke and calorific value of fuel
2piston diameter, specific fuel consumption and Calorific value of fuel
3piston diameter, length of stroke and speed of rotation
4specific fuel consumption, speed of rotation and torque

2.

A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as

1superheater
2air preheater
3economiser
4injector

3.

The diagram factor is the ratio of the

1area of the actual indicator diagram to the area of theoretical indicator diagram
2actual workdone per stroke to the theoretical workdone per stroke
3actual mean effective pressure to the theoretical mean effective pressure
4any one of the above

4.

Cut-off ratio is the ratio of

1swept volume to the volume at cut-off
2volume at cut-off to the clearance volume
3volume at cut-off to the swept volume
4clearance volume to the volume at cut-off

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