Mechanical Engineering MCQ Questions and Answers for Practice

1. Work is considered positive when

1. Work is done on the system
2. work is done by the system
3. both a and b
4. none of the above

2. A source of energy is known as renewable source

1. Fossil fuel
2. Solar
3. CNG
4. All of the above

3. 1 inch is equals to how many centimeters?

1. 2.5
2. 2.46
3. 2.54
4. 2.58

4. 1 kg/cm² = ........bar

1. 0.981
2. 9.81
3. 98.1
4. 981

5. A device which is used for pumping the water in boiler is

1. Feed check valve
2. Economi ser
3. Injector
4. Feed Pump

6. A device which is used for remove the impurities from the boiler is called

1. Economizer
2. Feed pump
3. Injector
4. Blow-off-cock

7. A system in which there is no transfer of mass across its boundaries is called

1. Closed system
2. Open system
3. Isolated system
4. None of this

8. A unit consists Of closed vessel, economizer, super heater, water wall tubes and it producing steam as per requirement called.

1. Boiler
2. Power plant
3. Steam generator
4. l.c. engine

9. Air vessel is used in

1. Centrifugal Pump
2. Vane pump
3. Gear pump
4. Single acting Reciprocating.

10. An isothermal process is governed by

1. Boyles law
2. Gay-Lussac law
3. Charles law
4. Avogadros law

11. CNG is an excellent for

1. petrol engine
2. Kerosene engine
3. Diesel engine
4. All of above

12. Cochran boiler is .

1. Vertical boiler
2. Natural circulation boiler
3. Fire tube boiler
4. All Of above

13. Compressor in which compression of air from suction pressure to delivery pressure takes place in more than one cylinder is called compressor.

1. Single acting
2. Double acting
3. Single stage
4. Multi stage

14. Compressor is a machine which is used to do

1. lift liquid from low height to higher elevation
2. To store liquid
3. To compress gas.
4. none of the above

15. Dryness fraction of wet steam is

1. greater than 1
2. less than 1
3. #NAME?