Objective Questions Inwards Mechanical Applied Scientific Discipline (Thermal Engineering) For Competitive Exams

Choose the correct answer:

1. One metre (1 m) of H2O column  is equivalent to 
(A) 0.1 kN per foursquare meter
(B) 1.0 kN per foursquare meter
(C) 10 kN per foursquare meter
(D) 100 kN per foursquare meter



2. Influenza A virus subtype H5N1 rotameter should e'er endure installed in 
(A) Horizontal position
(B) Vertifical position
(C) Inclined at thirty marker to the vertical
(D) Inclined at 45 marker to the vertical

3. Work done inwards gratis expansion procedure 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 alter inwards entropy of the organization in addition to surrounding is 
(A) Unity
(B) Zero
(C) Infinite
(D) Positive

6.During throttling process
(A) Internal publish energy does non change
(B) Pressure does non change
(C) Entropy does non change
(D) Enthalpy does non change

7. The bicycle to a greater extent than oft than non 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 subject on temperature
(B) Zero
(C) Minimum
(D) Maximum

9.The procedure during which external operate done is non zero, 
(A) Constant book process
(B) Constant pressure level process
(C) Throttling
(D) Free expansion

10. The efficiency of a diesel fuel bicycle volition endure maximum when 
(A) Speed is high
(B) Injection pressure level is high
(C) Cyclinder is H2O cooled
(D) Cut off is zero

11. Influenza A virus subtype H5N1 reversible engine working betwixt temperature limits of 500 K in addition to one 1000 K received l kJ heat. The work done yesteryear the engine volition be 
(A) l kJ
(B) 25 kJ
(C) -25 kJ
(D) 100 kJ

12. The business office of condenser inwards a steam ability establish is 
(A) to cut back dorsum pressure
(B) to utilize oestrus of exhaust steam
(C) to preheat feed H2O amongst exhaust steam
(D) to human activity every bit a oestrus sink

13. 1 Torr is equal to 
(A) 1 mm Hg
(B) 13.6 cm of H2O column
(C) 760 mm of Hg
(D) 760 mm of Water

14. The negative loop inwards 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 example of white body, absorptivity is 
(A) Zero
(B) Between 0 in addition to 0.5
(C) More than 0.5
(D) 1

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

17. Influenza A virus subtype H5N1 newly charged ammonia compression system, the clicking audio inwards the expansion valve indicates
(A) High pressure level afterward compression
(B) Excessive ammonia charged
(C) Evaporator coils chocked
(D) Lack of ammonia

18. In a vapour absorption organization the business office of rectifier is 
(A) To seprate ammonia in addition to water
(B) To cool the vapour leaving the analyser
(C) To dissolve ammonia inwards water
(D) To add together publish energy from external source

19. During air conditioning, whenever ii or to a greater extent than streams of moist are mixed, they follow
(A) Adiabatic process
(B) Isotherma process
(C) Polytropic process
(D) Isobaric process

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

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