AUTOMOBILE ENGINEERING SECTION 4

31. What type of fusion welding process is used for welding sheet metals of all engineering metals (except Cu, Ag) in automobile and air craft industries, pipe and tubing production ?

(A) Thermit welding

(B) Electroslag welding

(C) Resistance welding

(D) Submerged arc welding

Answer: - Resistance welding

32. In DC arc welding, if leads are arranged in work as Positive pole of the welding arc and electrode as Negative pole of the welding arc, the arrangement is known as

(A) Fusion

(B) Straight polarity

(C) Forward welding

(D) Reverse polarity

Answer: - Straight polarity

33. What is the type of joining process called, where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature

is obtained ?

(A) Ultrasonic welding

(B) Forge welding

(C) Electron beam welding

(D) Friction welding

Answer: - Friction welding

34. In a shaper

(A) Tool is stationary and work reciprocates

(B) Work is stationary and tool reciprocates

(C) Tool moves over stationary work

(D) Tool moves over reciprocating work

Answer: - Work is stationary and tool reciprocates

35. Orthographic projection is also known as

(A) Single view projection

(B) Two view projection

(C) Multi view projection

(D) All of the above

Answer: - Multi view projection

36. The distance a screw thread advances axially in one turn is the

(A) Lead

(B) Pitch

(C) Turn

(D) Crest

Answer: - Lead

37. This is the theoretically exact size from which limits of size are determined

(A) Actual Size

(B) Dimensioned size

(C) Production size

(D) Basic size

Answer: - Basic size

38. The coefficient of friction depends on

(A) area of contact

(B) shape of surfaces

(C) strength of surfaces

(D) nature of surface

Answer: - nature of surface

39. Limiting force of friction is the

(A) tangent of angle between normal-reaction and the resultant of normal reaction and limiting friction

(B) ratio of limiting friction and normal reaction

(C) the friction force acting when the body is just about to move

(D) the friction force acting when the body is in motion

Answer: - the friction force acting when the body is just about to move

40. Which of the following has no unit ?

(A) kinematic viscosity

(B) surface tension

(C) bulk modulus

(D) strain

Answer: - strain