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For a multi-stage reciprocating compressor, work consumed is less in the case of
A) Isothermal compression process B) Adiabatic compression process
C) Both A) and B) D) None of the above

According 10 Fourier’s law Heat transfer increases proportional to increase in
A) Cross-section area B) Temperature difference
C) Temperature gradient D) All the above

Three metal walls of same cross-sectional area and conductivity ratio 1 : 2: 4 transfer
heat at Q kJ/hr. If the walls are of same thickness, the temperature drops will be in
the ratio

A) 1:2:4 8) 1:1:1

0 1 D) None of the above
Methods to improve Brayton cycle efficiency are

A) Regeneration B) Reheating

C) Intercooling D) All the above

Factors affecting auto ignition in ೩೧ engine are
A) Richness of charge B) Inlet temperature
C) Both A) and B) D) None of the above

The numbers used in free convection calculations of fluids are
A) Grashoff, Prandtl B) Reynold, Prandtl
C) Mach, Reynold D) Mach, Grashoff

The basic law of convection is
A) Fourier’s law B) Planck’s law
C) Newton's law D) Stefan-Boltzmann law

The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is
1.45 um. If the peak wavelength of emitted radiation changes to 2.90 um, then the
temperature (in K) of the black body is

A) 500 B) 1000

C) 2000 D) 3000

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