Ordnance Factory Junior Works Manager Mechanical Paper 2017
Date of Exam – 03.09.2017
Which one of the following statements is correct?
(a) A machine which violates Clausius statement will violate the first law of thermodynamics
(b) A machine which violates Kelvin-Plank statement will violate the first law of thermodynamics
(c) A machine which violates the second law of thermodynamics will violate the first law of thermodynamics
(d) A machine which violates Kelvin-Plank statement will violate the Clausis statement
Which one of the following is correct in the context of change of entropy of a system undergoing a reversible adabatic process?
(a) Positive for expansion process and negative for compression process
(b) Positive for compression process and negative for expansioin process
(c) Negative for both the processes
(d) Positive for both the processes
Consider the following statments with reference to gas turbine cycle –
(1) Regeneration increases thermal efficiency
(2) Reheating decreases thermal efficiency
(3) Cycle efficiency increases when the maximum temperature of the cycle is increased
Which of the above statements are correct?
(a) 1, 2 and 3
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1 and 3 only
For the same pressure ratio during compression, compressing in two-stage compressor with perfect inter-cooling instead of a single-stage comporessor is characterized by
(1) Increase in volumetric efficiency
(2) Decrease in work input
(3) Decrease in discharge temperature
Which of the above statements are correct?
(a) 1 and 2 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
Thorium breeder reactors are more promising for India essentially because
(a) They develop more power
(b) The technology thereof is simple
(c) Thorium deposits are abundantly available in the country
(d) These can be easily designed
If Nusselt number is 4000 with corresponding Reynolds and Prandtl numbers as 40 and 20 respectively, the relevant Stanton number will be
(a) 40
(b) 20
(c) 10
(d) 5
The dimensioinless number relevant to transient heat conduction is
(a) Fourier Number
(b) Reynolds number
(c) Prandtl number
(d) Stanton number
In solving a lumped parameter problem, which one of the following pair of non-dimensional numbers is used?
(a) Grashoff number and Biot number
(b) Prandtl number and Nusselt number
(c) Biot number and Fourier Number
(d) Fourier number and Reynolds number
The conditioned air supplied to the room must have the capacity to take up
(a) Room sensible heat load only
(b) Room latent heat load only
(c) Both room sensible heat load and room latent heat load
(d) Neither room sensible heat load nor room latent heat load
An addition of manganese to aluminium results in the improvement of
(a) Strength characteristics
(b) Corrosion resistance
(c) Hardernability
(d) Toughness system
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