VSSC Technical Assistant Mechanical Paper 2015 | Vikram Sarabhai Space Centre Technical Assistant Mechanical Paper 2015
| 1 | For maximum efficiency in multi-stage compressor
(a) Air should be cooled to initial temperature between the stages (b) Pressure ratio for each stage should be same (c) Work done for each stage should be same (d) All of the above. |
| 2 | Ideal air standard efficiency of a closed cycle gas turbine depends on
(a) pressure ratio of the cycle only (b) temperature ratio of the cycle only (c) both the temperature ratio and pressure ratio (d) None of the above |
| 3 | The plant which is smaller in size and lower in weight for the same power, is
(a) Steam plant (b) Gas turbine plant (c) I.C engine plant (d) Diesel plant |
| 4 | At the critical pressure ratio for a convergent nozzle, the velocity at outlet will be
(a) More than sonic velocity (b) Less than sonic velocity (c) Equal to sonic velocity (d) None of the above |
| 5 | Ductility of a material can be defined as
(a) Ability to undergo large permanent deformation in compression (b) Ability to recover its original form (c) Ability to undergo large permanent deformations in tension (d) All of the above |
| 6 | % of carbon in Cast Iron is
(a) < 0.8% (b) < 1.3% (c) > 2% (d) > 6.3% |
| 7 | Which is false statement about tempering ? Tempering is done to
(a) Improve machinability (b) Improve ductility (c) Release internal stresses (d) Reduce hardness and brittleness |
| 8 | Brass contains
(a) 70% copper and 30% zinc (b) 70% copper and 30% tin (c) 30% copper and 70% tin (d) 60% copper and 40% tin |
| 9 | High speed steel (H.S.S) belongs to the category of
(a) medium-carbon steel (b) high-carbon steel (c) alloy steel (d) stainless steel |
| 10 | The hardness number of 1 of Moh’s scale is assigned to
(a) quartz (b) Talc (c) Topaz (d) Diamond |
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