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Chennai Petroleum Corporation Limited Junior Engineering Assistant IV Mechanical Paper 2019
Duration 120 minutes
No. of Questions – 120
In which casting process a vertical channel through which molten metal flows downward from pouring basin to runner for reaching the mould cavity is called
(a) sprue
(b) blister
(c) pinhole
(d) riser
The limiting values of Poission’s ratio are
(a) 0 to 0.5
(b) -1 to +1
(c) – infinity to + infinity
(d) 0 to 1
According to Tresca criteria yield locus is a
(a) Rectangle
(b) Circle
(c) Hexagon
(d) Parabola
Which of the following pair is not CORRECT?
(a) Lame’s constant – Thick cylinder
(b) Macaulay method – Deflection
(c) Euler’s method – Theory of Column
(d) Eddy’s theorem – Torsion of shafts
Bending moment changes signs for
(a) Simply suppported beam
(b) Cantilever beam
(c) Over hanging beam
(d) All of theses
Two shafts A and B are made of same material. The diameter of shaft A is twice that of shaft B. What is the ratio of power transmitted by shafts A and B?
(a) 2 : 1
(b) 4 : 1
(c) 8 : 1
(d) 16 : 1
The main purpose of chaplets is
(a) toensure directional solidfication
(b) to provide effecient venting
(c) to align the mould box
(d) to support the cores
Which of the following is not foundrytool?
(a) trowel
(b) arbor
(c) riddle
(d) slick
Disposable patterns are made of
(a) wood
(b) rubber
(c) metal
(d) polystyrene
Misrun is a casting defect which occurs due to
(a) very high pouring temperature of metal
(b) insufficient fluidity of the molten metal
(c) absorption of gases by the liquid metal
(d) improper alignment of the mould flasks
The most preferred process for casting gas turbine blades is
(a) die moulding
(b) shell moulding
(c) investment casting
(d) sand casting
Vacuum environment is required in
(a) ultrasonic welding
(b) laser beam welding
(c) plasma arc welding
(d) electron beam welding
For ultrasonic welding the frequency range is generally
(a) 100 to 400 Hz
(b) 400 to 4000 Hz
(c) 4000 to 20000 Hz
(d) 20000 to 50000 Hz
Which welding process is normally used for the manufacturing of large boilers and heavy marine components?
(a) Plasma arc welding
(b) Inert arc gas welding
(c) Submerged arc welding
(d) Thermit welding
Acetylene gas is produced from
(a) Carbon
(b) Calcium carbide
(c) Calcium chloride
(d) Calcium carbonate
Last Updated on – 7th April 2022
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