RRB JE - Workshop Technology 1000+ MCQ [Solved] PDF Download

1. The electrodes used in spot welding have a tip of
A. Stainless steel
B. Aluminium
C. Copper
D. Brass
Answer : C

2. The hot working of metals is carried out
A. At the recrystallisation temperature
B. Below the recrystallisation temperature
C. Above the recrystallisation temperature
D. At any temperature
Answer : C

3. The cold chisels are made by
A. Drawing
B. Rolling
C. Piercing
D. Forging
Answer : D

4. A taper provided on the pattern for its easy and clean withdrawal from the mould is known as
A. Machining allowance
B. Draft allowance
C. Shrinkage allowance
D. Distortion allowance
Answer : B

5. The increase in hardness due to cold working, is called
A. Age hardening
B. Work hardening
C. Induction hardening
D. Flame hardening
Answer : B

6. For cutting brass, the hacksaw blade should have __________ teeth per 25 mm.
A. 14
B. 24
C. 32
D. 40
Answer : A

7. The temperature produced by oxy-hydrogen flame is about
A. 1800°C
B. 2100°C
C. 2400°C
D. 3200°C
Answer : C

8. Which of the following statement is wrong?
A. The angular clearance on dies varies from 0.5° to 1°
B. In drawing operation, the metal flows due to plasticity
C. In press operation, the size of the pierced hole is independent of the size of punch
D. None of the above
Answer : D

9. The welding process used in joining mild steel shanks to high speed drills, is
A. Spot welding
B. Seam welding
C. Flash butt welding
D. Upset butt welding
Answer : C

10. The cutting edge of a chisel should be
A. Hardened
B. Tempered
C. Hardened and tempered
D. Case hardened
Answer : C

11. Riddle is used for
A. Smoothing and cleaning out depressions in the mould
B. Cleaning the moulding sand
C. Moistening the sand around the edge before removing pattern
D. Reinforcement of sand in the top part of moulding box
Answer : B

12. Spot welding is used for welding
A. Lap joints in plates having 0.025 mm to 1.25 mm thickness
B. Lap joints in plates having thickness above 3 mm
C. Butt joints in plates having 0.025 mm to 1.25 mm thickness
D. Butt joints in plates having thickness above 3 mm
Answer : A

13. A two high rolling mill consists of two rolls which rotate
A. At the same speed and in the same direction
B. At the same speed but in opposite direction
C. At different speeds and in the same direction
D. At different speeds and in the opposite direction
Answer : B

14. The instrument which has all the features of try-square, bevel protractor, rule and scriber, is
A. Outside micrometer
B. Inside micrometer
C. Depth gauge micrometer
D. Combination set
Answer : D

15. The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as
A. Hot piercing
B. Extrusion
C. Cold peening
D. Cold heading
Answer : C

16. The machining allowance provided on patterns depends upon
A. Type of casting metal
B. Size and shape of casting
C. Method of casting used
D. All of these
Answer : D

17. Metal patterns are used for
A. Small castings
B. Large castings
C. Complicated castings
D. Large scale production of castings
Answer : D

18. A diamond pointed chisel is used for cutting
A. Flat surfaces
B. Grooves
C. Keyways
D. V-shaped grooves
Answer : D

19. Cold working of metal increases
A. Tensile strength
B. Yield strength
C. Hardness
D. All of these
Answer : D

20. The difference between the upper limit and lower limit of a dimension is called
A. Nominal size
B. Basic size
C. Actual size
D. Tolerance
Answer : D

21. In arc welding, the electric arc is produced between the work and the electrode by
A. Voltage
B. Flow of current
C. Contact resistance
D. All of these
Answer : C

22. A moving mandrel is used in
A. Wire drawing
B. Tube drawing
C. Metal cutting
D. Forging
Answer : B

23. When the dimension is expressed as 20 -0.025 ????³?, then the basic size is
A. 20 mm
B. 20.035 mm
C. 20.025 mm
D. 19.975 mm
Answer : A

24. A casting defect which occurs due to improper venting of sand is known as
A. Cold shuts
B. Blow holes
C. Shift
D. Swell
Answer : B

25. In piercing operation, the clearance is provided on
A. Punch
B. Die
C. Half on the punch and half on the die
D. Either on punch or die depending upon designer's choice
Answer : B

26. A jolt machine is used to
A. Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
B. Ram the sand harder at the back of the mould and softer on the pattern face
C. Produce uniform sand hardness throughout the mould
D. Produce uniform packing of sand in the mould
Answer : A

27. The mode of deformation of the metal during spinning is
A. Bending
B. Stretching
C. Rolling and stretching
D. Bending and stretching
Answer : D

28. Thermit, used in Thermit welding, is a mixture of
A. Charcoal and iron oxide
B. Charcoal and aluminium
C. Iron oxide and aluminium
D. Charcoal, iron oxide and aluminium
Answer : C

29. In spot welding, the spacing between two spot weld should not be less than
A. d
B. 1.5 d
C. 3 d
D. 6 d
Answer : C

30. The surface to be machined is marked on the pattern by
A. Red colour
B. Yellow colour
C. Black colour
D. Blue colour
Answer : A

31. Acetylene gas is stored in cylinders in
A. Solid form
B. Gaseous form
C. Liquid form
D. Any one of these
Answer : C

32. In order to get uniform thickness of the plate by rolling process, one provides
A. Camber on the rolls
B. Offset on the rolls
C. Hardening of the rolls
D. Antifriction bearings
Answer : C

33. Structural sections such as rails, angles, I-beams are made by
A. Hot rolling
B. Hot drawing
C. Hot piercing
D. Hot extrusion
Answer : A

34. In a hot chamber die casting machine
A. Melting pot is separate from the machine
B. Melting pot is an integral part of the machine
C. Melting pot may have any location
D. High temperature and pressure is used
Answer : B

35. During drawing operation, the states of stress in cup would include
A. Compressive stress in the flange
B. Tensile stress in the wall
C. Both (A) and (B)
D. None of these
Answer : C

36. In permanent mould casting method
A. Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
B. Molten metal is poured and allowed to solidify while the mould is revolving
C. Molten metal is forced into mould under high pressure
D. None of the above
Answer : D

37. When a hole or cavity to be cored is not in line with the parting surface, then a ________ is used.
A. Horizontal core
B. Vertical core
C. Drop core
D. Balanced core
Answer : C

38. To prevent the body of the blade from jamming in the saw cut, the teeth of blade are
A. Strengthened
B. Sharpened
C. Set
D. All of these
Answer : C

39. Piercing is an operation of cutting
A. A cylindrical hole in a sheet of metal by the punch and the die
B. A hole (other than cylindrical) in a sheet of metal by the punch and the die
C. A flat sheet to the desired shape
D. A number of holes evenly spaced in a regular pattern on a sheet of metal
Answer : B

40. Which of the following statement is wrong?
A. The mortise gauge has two scribing pins
B. The gouges are chisels with a hollow shaped blade
C. An auger is a planing tool
D. All of these
Answer : C

41. When the dimension is expressed as, then the tolerance is
A. 0.035 mm
B. 0.025 mm
C. 0.01 mm
D. 0.06 mm
Answer : D

42. The temperature of the inner luminous cone of neutral flame is about
A. 1000°C
B. 1250°C
C. 2100°C
D. 3200°C
Answer : D

43. The electrode tip diameter (d) in spot welding should be equal to (where t = Thickness of plate to be welded)
A. t
B. 1.5 t
C. 3 t
D. 6 t
Answer : A

44. The adhesiveness is the property of sand due to which
A. It evolves a great amount of steam and other gases
B. The sand grains stick together
C. It clings to the sides of a moulding box
D. None of these
Answer : C

45. In a gas welding of mild steel using an oxyacetylene flame, the total amount of acetylene consumed is 10 litres. The oxygen consumption from the cylinder is
A. 5 litres
B. 10 litres
C. 15 litres
D. 20 litres
Answer : B

46. In average work, the tolerance produced by investment casting method is
A. ±0.05 mm
B. +0.2 mm
C. +05 mm
D. +1 mm
Answer : A

47. Notching is the operation of
A. Cutting a sheet of metal in a straight line along the length
B. Removal of metal to the desired shape from the edge of a plate
C. Cutting a sheet of metal through part of its length and then bending the cut portion
D. Bending a sheet of metal along a curved axis
Answer : B

48. The welding set up is said to have straight polarity, when
A. Work is connected to the positive terminal and the electrode holder to the negative terminal
B. Work is connected to the negative terminal and the electrode holder to the positive terminal
C. Work is connected to the positive terminal and the electrode holder is earthed
D. Work is connected to the negative terminal and the electrode holder is earthed
Answer : A

49. The electron beam welding can be carried out in
A. Open air
B. A shielded gas environment
C. Vacuum
D. A pressurised inert gas chamber
Answer : C

50. In a simple die
A. Two or more operations are performed simultaneously at the single stroke of the ram
B. Two or more cutting operations are performed at one station of the press in every stroke of the ram
C. Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram
D. None of the above
Answer : D