51.
Which of the following statement is wrong?

52.
The parts of circular cross-section which are symmetrical about the axis of rotation are made by

53.
The recrystallisation temperature of steel is

54.
The teeth of hacksaw blade are bent

55.
The operation of bending a sheet of metal along a curved axis, is known as

56.
In forehand welding, the angle between the welding torch and the work is ________ as compared to backhand welding.

57.
The electron beam welding can be carried out in

58.
Structural sections such as rails, angles, I-beams are made by

59.
A hacksaw blade cuts on the

60.
V-block is used to

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