DFCCIL Question-Paper Contributed by Not Specified updated on Jun 2019

Dedicated Freight Corridor Corporation of India (DFCCIL) mechanical engg questions with answers

1. For the purpose of comparison, the steam generating capacity of a boiler is generally expressed in terms of 

equivalent evaporation-Answer

kg/hr

steam pressure

thermal efficiency

2. One of the following methods is adopted for governing of steam turbines in a power plant 

hit and miss governing

blow off in boiler

throttle governing-Answer

speed control

3. An aircraft gas turbine operates on 

Sterling cycle

Bryton cycle-Answer

Rankine cycle

Otto cycle


4. The output of a gas turbine is 300 KW and its efficiency is 20 percent, the heat supplied is 

150 KW

6000 KW

600 KW

15 KW-Answer

5. Which of the following is not used as a refrigerant ? 

carbon monoxide-Answer

amonia

sulphur dioxide

carbon dioxide


6. A refigerant used in the domestic refrigerator is 

Sulphur dioxide

air

methane

freon-Answer

7. In Industry of the developed nations the type of production most often occurring is 

Mass production

Batch production-Answer

Single lot production

Create lot production

8. Quick return motion is used in a 

lathe

drilling

shaper-Answer

grinder


9. Draft on a pattern is provided for 

facilitating pattern making

easy lifting of the casting

facilitating withdrawal of the pattern from the mould

providing for strinkage of the casting-Answer


10. Which of the following operations cannot be performed on a lathe 

facing

drilling

thread cutting

slotting-Answer


11. The pump with a low initial cost and low maintenance cost is 

gear pump

bucket pump

double acting piston pump

centrifugal pump-Answer

12. Mandrels are used to hold 

cutting tools

hollow work pieces-Answer

face plate

drill bits


13. The operation of enlarging of a hole is called 

drilling

reaming

boring-Answer

counter sinking


14. In upcut milling the work piece is fed 

at angle of 60 deg to the cutter

against the rotating cutter-Answer

at the right angle to the cutter

in the direction of the cutter

15. Sprue is the passing provided for the 

outflow

smooth flow

inflow-Answer

solidification of the molten material


16. Feed in a lathe is expressed in 

mm per revolution-Answer

mm per degree
mm

rpm


17. Rapping allowance is provided on a pattern to take care of 

shrinkage

distortion

machining

easy withdrawl-Answer


18. Upsetting is the term used in one of the following operations 

casting

turning

drilling

forging-Answer


19. Reducing flame is obtained in oxyactetylane welding with 

excess oxygen

equal parts of both gases

excess of acetylene-Answer

reduced acetylene


20. Brasses and bronzes are welded using 

neutral flame-Answer

oxidizing flames

carburising flame

reducing flame

21. One of the materials used for making surface plate is 

granite-Answer

brass

stainless steel

wood


22. In a process chart the inverted triangle symbol indicates 

an operation

inspection

storage-Answer

transport


23. One of the following function is not performed by coating on the welding electrodes 

increase the cooling rate-Answer

provide protective atmosphere

refuce oxidation

stabilize the arc

24. Feeler gauges are used for measuring the 

thickness of plates

clearances between mating parts-Answer

pitch of screw threads

radius of curvature


25. A micrometer screw has pitch of 0.5 mm and the themble has 100 equal divisions marked on it, the least count of the instrument in mm is 

0.05

0.5

0.025

0.005-Answer


26. One of the following objectives is not achieved by the process of annealing 

to relieve internal stress

to refine grain structure

to increase the yield point-Answer

to soften the metal


27. In oxacetylane welding, acetylene is produced using 

Ca (OH)2 and CO2

Ca C2 and H2O-Answer

CaCO3 and H2O

CH4 and H2SO4

28. A product layout is generally suggested for 

continuous type of production-Answer

jobbing work

batch production

efficient machine utilisation

29. The objective of time study is to determine the time taken by 

a new worker

a trainee

a very good worker

efficient machine utilization-Answer

30. The break even point is that volume of production where 

no profit exists-Answer

maximum profits are obtained

fixed costs are less

minimum losses occur


31. The melting point of the filler material in brazing should be above 

420 deg C-Answer

600 deg C

800 deg C

1000 deg C
 

feedback