Cochin Shipyard JTA Quality Control Mechanical Paper 2020
Exam Date – 11th Jan 2020
Mittre gears are used for
(a) great speed reduction
(b) transmitting motion between two intersecting shafts
(c) minimum axial thrust
(d) minimum back lash
b
The door of a running refrigerator inside a room was left open. Which of the following statements is correct
(a) The room will be cooled to the temperature inside the refrigerator
(b) The room will get gradually warmed up
(c) The room will get slightly cooler
(d) Any one of the options depending on the capacity of the refrigerator
b
Rotary compressors are used for delivering
(a) large quantities of air at low pressures
(b) small quantities of air at high pressures
(c) large quantitites of air at high pressures
(d) small quantitites of air at low pressures
a
The function of a flywheel is
(a) to convert receiprocating motion of the piston into rotary motion
(b) to convert rotary motion of the crankshaft into to and fro motion of the valve rod
(c) to prevent fluctuation of speed
(d) to keep the engine speed uniform at all load condition
c
The purpose of a riser is to
(a) deliver molten metal into the mould cavity
(b) act as a reservoir for the molten metal
(c) deliver the molten metal from pouring basin to gate
(d) feed the molten metal to the casting in order to compensate for the shrinkage
d
Within elastic limit, shear stress is
(a) equal to shear strain
(b) less than shear strain
(c) directly proportional to shear strain
(d) inversely proportional to shear strain
c
A thermistor is a type of
(a) switch
(b) resistor
(c) battery
(d) power supply
b
In a four stroke cycle, the minimum temeprature inside the engine cylinder occurs at the
(a) beginning of suction stroke
(b) end of suction stroke
(c) beginning of exhaust stroke
(d) end of exhaust stroke
a
What is ‘Go limit’?
(a) Upper limit of shaft and lower limit of a hole
(b) Lower limit of shaft and hole
(c) Lower limit of shaft and upper limit of hole
(d) Upper limit of shaft and hole
a
The objective of supercharging the engine is
(a) to reduce mass of the engine per brake power
(b) to reduce space occupied by the engine
(c) to increase the power output of an engine when greate power is required
(d) All of the options
d
The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (Cv) is
(a) equal to one
(b) less than one
(c) greater than one
(d) None of the options
c
For a floating body in a liquid the normal pressure exerted by the liquid acts at
(a) bottom surface of the body
(b) CG of the body
(c) metacentre
(d) all points on the surface of the body
d
Addition of _______ gives stainless steel an austenitic structure
(a) Molybdenum
(b) Chromium
(c) Nickel
(d) Vanadium
c
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