Rajasthan Junior Instructor Welder 2019 Paper

RSMSSB Junior Instructor Welder Paper 2019
Date of Exam – 26th March 2019

During welding, voltage required to maintain arc is of the order
(a) 15 – 45 volt
(b) 60 – 100 volt
(c)100 – 125 volt
(d)180 – 240 volt

Long arc are generally formed by the voltage and current respectively
(a) Low, Low
(b) High, High
(c) Low, High
(d) High, Low

The length of short arc is generally considered as
(a) Less than 2 mm
(b) More than 2 mm
(c) Upto 6 mm
(d) More than 6 mm

The problem of arc blow generally occurs –
(a) In AC
(b) In DC
(c) In AC and DC both
(d) Unpredictable

Ferrous and non ferrous metals can be welded in
(a) A.C welding and D.C welding both
(b) D.C welding
(c) A.C welding
(d) None of these

In which welding device, movable parts exists?
(a) A.C welding transformer
(b) D.C motor generator set
(c) Both A.C wedling transformer and D.C motor generator set
(d) Gas welding apparatus

What should not be done during arc welding?
(a) Use of earth clamps
(b) Making cable contact with oil
(c) Use of hand shield
(d) Use of gloves

Earth clamps are made of
(a) Zinc
(b) Steel
(c) Gun metal
(d) Aluminium

What is wrong regarding the function of flux?
(a) To stabilize the arc
(b) Make an isolated environment around the arc
(c) To deposit slag on molten metal
(d) To change the shape of base metal

Rays emitted during welding, which are hazardous for eyes, are
(a) Ultraviolet rays
(b) Alpha rays
(c) X-rays
(d) Gama rays