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Objective questions in mechanical engineering (Thermal Engineering) for competitive exams

Choose the right answer:

1. One metre (1 m) of water column  is equivalent to 
(A) 0.1 kN per square meter
(B) 1.0 kN per square meter
(C) 10 kN per square meter
(D) 100 kN per square meter

2. A rotameter should always be installed in 
(A) Horizontal position
(B) Vertifical position
(C) Inclined at 30 degree to the vertical
(D) Inclined at 45 degree to the vertical

3. Work done in free expansion process is 
(A) Zero
(B) Minimum
(C) Maximum
(D) Positive

4. 1 kgf/cm2 is equal to 
(A) 1 mm Hg
(B) 100 mm Hg
(C) 735.6 mm Hg
(D) 760 mm Hg

5. For a reversible adiabatic process, the change in entropy of the system and surrounding is 
(A) Unity
(B) Zero
(C) Infinite
(D) Positive

6.During throttling process
(A) Internal energy does not change
(B) Pressure does not change
(C) Entropy does not change
(D) Enthalpy does not change

7. The cycle generally used for gas turbine is 
(A) Rankine cycle
(B) Brayton cycle
(C) Dual cycle
(D) Carnot cycle

8. At critical point, the enthalpy of vaporization is
(A) Only dependent on temperature
(B) Zero
(C) Minimum
(D) Maximum

9.The process during which external work done is not zero, 
(A) Constant volume process
(B) Constant pressure process
(C) Throttling
(D) Free expansion

10. The efficiency of a diesel cycle will be maximum when 
(A) Speed is high
(B) Injection pressure is high
(C) Cyclinder is water cooled
(D) Cut off is zero

11. A reversible engine working between temperature limits of 500 K and 1000 K received 50 kJ heat. The work done by the engine will be 
(A) 50 kJ
(B) 25 kJ
(C) -25 kJ
(D) 100 kJ

12. The function of condenser in a steam power plant is 
(A) to reduce back pressure
(B) to utilize heat of exhaust steam
(C) to preheat feed water with exhaust steam
(D) to act as a heat sink

13. 1 Torr is equal to 
(A) 1 mm Hg
(B) 13.6 cm of water column
(C) 760 mm of Hg
(D) 760 mm of Water

14. The negative loop in the PV diagrams of a petrol engine is due to 
(A) Pre-ignition
(B) Detonation
(C) Suction of air
(D) Early opening of exhaust valve

15. In case of white body, absorptivity is 
(A) Zero
(B) Between 0 and 0.5
(C) More than 0.5
(D) 1

16. Solar cells are made of
(A) Silica
(B) Steel
(C) Antimony
(D) Phosphorus

17. A newly charged ammonia compression system, the clicking sound in the expansion valve indicates
(A) High pressure after compression
(B) Excessive ammonia charged
(C) Evaporator coils chocked
(D) Lack of ammonia

18. In a vapour absorption system the function of rectifier is 
(A) To seprate ammonia and water
(B) To cool the vapour leaving the analyser
(C) To dissolve ammonia in water
(D) To add energy from external source

19. During air conditioning, whenever two or more streams of moist are mixed, they follow
(A) Adiabatic process
(B) Isotherma process
(C) Polytropic process
(D) Isobaric process

20. In a cooling tower, heat is disssipated mainly by 
(A) Radiation
(B) Conduction
(C) Convection
(D) Evaporation

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