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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
