ے_

൭4. Work input to the air compressor with n as index of compression :
() inercases with ingrease in value of n
(B) decrease with increase in value of n
(C) remains same whatever the value of n

(D) first increases and then decreases with value 071

25. 1 tonne of refrigeration is equiv_alent to:

(ക) 336 kd/min (2) 210 kd/min

(C) 1400 kJ/min (D) 540 kd/min
26. The thermal conductivity is expressed as :

(५) W/mK ⋅ ≺⇃∃≻∇∇∣⋯∅↕⊰

(C) W/hmK D) W/hm?2K

97. In SI engines which one of the following is the correct order of the fuels with increasing
detonation tendency :

(മ) Paraffins, Olefins, Naphthenes, Aromatics
(B) Aromatics, Naphthenes, Paraffins, Olefins
(0) ॐ Olefins, Aromaties, Paraffins
(D) Aromatics, Napthenes, Olefins, Paraffins

28. The Nusselt number in natural convection is a function of Prandtl number and :
(ಹ) Stanton number (B) Biot number
(C) Reynolds number (D) Grashoff number

29. Which of the following properties of a refrigerant is undesirable?
(A) high critical temperature (B) low specific heat of liquid
(C) - low specific volume vapour (D) high boiling point

30. The emissivity of a body is equal to absorptivity when the body remains in thermal
equilibrium. This law refers to as :

(ಗಿ) Planck’s law (B) Lambert’s law
(C) Kirchoff's law (D) Wien’'s displacement law

81. [ட a vapour compression cycle the condition of refrigerant is saturated liquid :
(A) before entering the compressor
(B) before passing through the condenser
(C) after passing through the condenser
(D) after passing through the expansion valve

. 147/2015 6 A