1. At which pressure (in kg/cm²) the properties of water and steam become identical ?

0.1

1

100

225.6

Answer: 225.6

Explanation:


2. Cochran boiler is a ?

horizontal fire-tube boiler

horizontal water-tube boiler

vertical water-tube boiler

vertical fire tube boiler

Answer: vertical fire tube boiler

Explanation:


3. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is ?

more

less

same

could be more or less depending on other factors

Answer: more

Explanation:


4. Supercharging is the process of ?

supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

providing forced cooling air

injecting excess fuel for raising more load

supplying compressed air to remove combustion products fully

Answer: supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

Explanation:


5. The accumulation of carbon in a cylinder results in increase of ?

clearance volume

volumetric efficiency

ignition time

effective compression ratio

Answer: effective compression ratio

Explanation:


6. Which of the following is a false statement Excess quantities of Sulphur in diesel fuel are objectionable because it may cause the following ?

piston ring and cylinder wear

formation of hard coating on piston skirts

oil sludge in the engine crank case

detonation

Answer: detonation

Explanation:


7. Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power ?

upto 25%

upto 35%

upto 50%

None of these

Answer: None of these

Explanation:


8. In order to prevent formation of carbon on the injector, the temperature (in °C) of nozzle tip should be ?

less than 100

between 100 – 250

between 250 – 300

between 400 – 500

Answer: between 250 – 300

Explanation:


9. What kind of contact can be established for a higher pair ?

Point contact

Surface contact

No contact

None of these

Answer: Point contact

Explanation:


10. How many degrees of freedom exist in a free body in space ?

3

4

5

6

Answer: 6

Explanation: