Module 6 Set-2 - DGCA MODULE

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#1. Corrosion on ferrous metals is chemically removed by caustic and non-caustic chemicals depending upon:-

(a) Type of corrosion

(b) Area affected

(d) Both (a) & (b) and type of metal affected

#2. ………percent of copper may be present as incidental elements in alloy steels.

a.0.25

b.0.35

c. 0.05

#3. …………is used for making compressor disk, spacer rings, compressor blades and vanes, through bolts, turbine housing and lines, and miscellaneous hardware for turbine engine.

a) Al

b) Ti

c) Cr-mb

#4. When a section dimensions are 6” X 6” or larger & approx. square is called……

a. Bloom.

b. Slab.

c. Billet.

#5. In annealing greater softening can be achieved if

a) Cooling rate is very slow and it is cold in furnace

b) Heating just belowthe critical point

c) Heating just above the critical point

d) Both a and b are correct

#6. The portion of tooth space that is cut below the pitch circle is equal to addendum plus clearance ?

a. addendum

b. pitch circle

c. deddendum

#7. Chromium in Stainless Steel makes it:

(a) Heat Resistant.

(b) Corrosion Resistant.

(d) Wear Resistant.

#8. After heat treatment tempering is done to

a)Reduce brittleness and restore ductility

b) Increase brittleness and ductility

c) Increase hardness and strength

d) Increase hardness only

#9. Recessed triangle on head surface

a. close tolerance bolt

b. jo- bolt

c. internal wrenching bolt

#10. Diametric pitch of gear is ? shop theory

a. represent the no. of tooth per inch of a pitch diameter

b. as in a and higher pitch diameter no. means smaller tooth size

c. as in a and higher pitch diameter no. means higher tooth size

d. none

#11. muntz metal composed of ___________

a) 40% Cu and 60% zinc

b) 60% Cu and 40% zinc

c) 60% brass and 40% Cu

#12. The 6000 series contains

a) Silicon

b) Zinc

c) Silicon and Magnesium

#13. A salt bath heating range is…………….

a. 325degree F to 2450 deg. F.

b. 650 deg, F to 1700 deg. F

c. 1700deg F to 2450 deg. F.

#14. Balls and rollers of anti-friction bearings are generally made of ….

a. Nickel steel.

b. Chromium steel.

c. Carbon steel

#15. What are miter gear

a) Name given to mating bevel gear

b) 1 + Having same no. of teeth and pitch cone

c) 2 + Having angle of 45 degree

#16. MTCS about Microbiological corrosion

a) 40֯ C and humidity of 70֯

b) 20-40֯C & relative humidity of 85-100%

c) 35֯ C & relative humidity 50%

#17. One of the distinctive features of 18-8 steel is that…………… . .

a. Strength may be decreased by cold working

b. Strength may be increased by cold working

c. Strength can ‘t be changed.

#18. . …………steel has replaced carbon steel in fabrication of structural parts.

a. Stainless steel.

b. Chrome-vanadium steel.

c. Molybdenum steel.

#19. Four- Numerical series is used to designate the

a. Plain carbon and alloy

b. Molybdenum

c. Certain types of alloy steels

#20. To relieve strain and reduce brittleness steel is ………. after being hardened.

a. Annealed. .

b. Tempered.

c. cold worked

#21. Fairleads should never deflect the ailment of cable more than _____from straight line

a) 5֯

b) 3֯

c) 4֯

#22. A O-ring designate specifically for the use as a static Seal properly will not to the job when installed on the

a) Stationary

b) Moving parts

c) Both

#23. When a piece of metal is cut, the material is subjected, as it comes in contact with the cutting edge, to a force known as…………

a. cutting force.

b. shear force.

c. torsion force.

#24. MTCS

a) Red – 15

b) Blue – 10

c) Yellow – 11

d) All of the above

#25. Hardest structure of metals

a. Austenite

b. Cementite

c. Martensite

#26. In hot working metal is heated ………… and rolled into various shapes.

a. bellow the critical range.

b. above the critical range.

c. in red hot condition.

#27. As the temperature increases colour of steel changes from dull red to a variety of colours and finally to…………..

a. dark red.

b. yellow.

c. white

#28. Which has low water absorption rate and good resistance and low temperature

a) Natural rubber

b) Butyl rubber

c) Buna-S

#29. Furnaces operating at temperature of about 2500 degree F usually employ resister bar of ………………….

a. Iron carbides

b. Magnesium carbides.

c. sintered carbides

#30. Bearing which takes radial loads

a) straight roller bearing

b) thrust bearing

c) tapered roller bearing

#31. MTCS Clearance

a) Difference between addendum and dedendum

b) Difference between whole depth and working depth

c) Equal to twice of addendum

#32. Annealing process used in sheet and wire industries to restore ductility is

A) Process annealing

B) Shop annealing

C) Normalising

D) None

#33. Lead baths can be used in the temperature range of……………….

a. 650 deg. F to 2450 deg. F

b. 325 deg. F to 650 deg.F

c. 650 deg. F to 1700 deg. F

#34. Which of the following is easily removable

a) Fasteners

b) Welding joints

c) Rivets

#35. INCONEL is a alloy of…………

a. Nickel-chromium-iron.

b. Nickel-vanadium-iron.

c. Nickel-molybdenum-iron.

#36. Al is vital to aviation because

a) High strength to weight ratio

b) Ease of fabrication

c) Its light weight

d) All the above

#37. .Which gear is one which the teeth are cut so that they radiate from apex of the cone and lie on the conical surface

a) BEVEL gear

b) SPUR gear

c) HELICAL gear

#38. To produce maximum softness the metal must be cooled ………..

a. very fast.

b. very slowly

c. in air.

#39. Presence of Sulphur in Iron makes it :

(a) Hard.

(b) Soft.

(d) None.

#40. If the finished forged surface is concave……..

a. The force applied is too weak.

b. The force applied is too strong.

c. The force applied is not the reason.

#41. Nickel steel causes the spark stream

a. Long shaft that are straw colour

b. Straight white sprigs

c. White blocks of light within the main burst

#42. INCONEL has strength greater than ……..percent of Nickel.

a. 30 %.

b. 50 %.

c. 25 %.

d. 0.50 %

#43. Which type of fitting is used in plumbing

a) Flare and flareless

b) flareless and swaged

c) Bead and clamp

#44. Surface oxidation of steel or cast iron is often known as …………

a. Scaling.

b. flaking.

c. Pitting.

#45. Which type of the corrosion penetrates to the core

a) pitting

b) intergranular

c) stress corrosion

#46. MTCS about Glue

a) put glue non uniformly

b) uniformly gluing but not sanding

c) if moisture is in 15-20% range

#47. ………have no clearly defined grip length

a) Screw

b) Bolt

c) Rivets

#48. The distance a screw thread advance axially in one turn

a) Lead

b) Root

c) Crest

#49. In Chrome-vanadium steel, the percentage of chromium and vanadium are…….

a. 18 % & 1 %

b. 1% & 18%.

c. 8% & 18%

#50. Stainless steel expands about………..percent more than mild steel.

a. 40%

b. 80%.

c. 50%

#51. . ………… furnaces require air for proper combustion and an air compressor or blower is therefore necessary.

a. Electric.

b. Fuel fired

c. Large

#52. The ………….. strength of material is it’s resistance to twisting.

a. Rotational.

b. Shear

c. Torsional

#53. The extra flexible control cables are used in

a) Flaps

b) Trim taps

c) Primary control

#54. The thermocouple which can be used upto 2800 deg. F, is made of ………. & ………..

a. Platinum & rhodium

b. copper & constantan

c. chromel & alumel.

#55. As a general rule, a soaking period of ………….. to …………is sufficient for the average heat-treating operation.

a. 1 hour to two hours.

b. 1 hour to four hours.

c. 30 min. to 1 hour.

d. 30 min. to 2 hours

#56. …………are shaped or formed by pressing or hammering heated metal in dies.

a).Casting.

b).Forging.

c).Forming

#57. Sheet forms is used for secondary structural stressed structural parts

a) Low carbon steel

b) Medium carbon steel

c) High carbon steel

#58. The Belleville spring are used in

a) linear loads

b) Non-linear loads

c) Axial loads

#59. The size of gear is determined by

a) Gear ratio

b) Pitch circle diameter

c) Number of teeth

#60. SAE 1010 to 1030 is a ………….. carbon steel.

a. High carbon steel

b. Low carbon steel

c. Medium carbon steel

#61. Nitriding is used for

A) Stainless steels

B) Nitro alloys

C) Special steels

D) All

#62. When the alloy become too hard for further forming it have to be re-heat treated or …………

a. Annealed.

b. Tempered.

c. Hardening.

#63. Beryllium Cu physical properties can be inc by

a) Heat treatment

b) Stress relieving

c) Full annealing

#64. The temperature of heat-treating furnace is measured by………….

a. Potentiometer

b. Pyrometer.

c. Thermometer.

#65. Which type of plastics harden upto heating, and reheating has no softening effect

a) Thermoplastic

b) Thermosetting plastic

c) Both a) and b)

#66. Steel with less than 0.85 C is called

a) Hyper eutectoid

b) hypo eutectoid

c) Eutectoid

d)none

#67. Running seal is

a) Packing

b) Gasket

c) O-ring Packing

#68. Mark the correct statement:- (DGCA Paper-2 Exam)

(a) Coating of pure Al on Al alloy is called Alclad.

(b) Titanium has low strength to weight ratio.

(d) Both (a) and (b)

#69. Strength of chrome vanadium stell can be increased by ? 9A 5-69 0R 5-4

a. cold rolling

b. heat treatment

c. case hardening

#70. Tempered condition refers to the condition of metal or metal alloys with respect to …………. Or ………..

a. Hardness or brittleness.

b. Ductility or elasticity.

c. Hardness or toughness.

#71. Nickel increase ……….. & ………. When combined with carbon steel.

a. Hardness & Tensile strength,

b. Tensile strength & Elastic limit.

c. Hardness & Ductility

d. Both a and b are correct

#72. . ………. Welds readily and has working qualities quite similar to those of corrosion resistance steels.

a. Monel.

b. Inconel

c. K-Monel

Finish