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Liquid Propulsion System Centre, Indian Space Research Organisation Technical Assistant Mechanical 2018 Paper

The maximum energy that can be absorbed up to the elastic limit, without creating a permanent distortion is called
(a) Proof resilience
(b) Modulus of resilience
(c) Toughness
(d) Flexural rigidity

When a rod of circular cross section is fixed at one end and subjected to an axial load of 500N, the deflection under the load is found to be 2.4mm, what will be the amount of deflection under the same load if the dia of rod is doubled & length is reduced to half of the original length.
(a) 1.2 mm
(b) 0.6 mm
(c) 0.3 mm
(d) 0.15 mm

In radial cams the angle between the direction of motion of follower to the normal to the pitch curve is called
(a) Cam angle
(b) Critical angle
(c) Pressure angle
(d) None of the above

In a double acting receprocating pump if the area of piston is 200 sq. cm and length of stroke is 15 cm and crank is rotating at 60 rpm then neglecting the lossses, the discharge of pump is
(a) 6 Litre/min
(b) 60 Litre/ min
(c) 360 Litre/min
(d) 200 Litre/min

______ is the point in a fluid stream where the diameter of the stream is the least, and fluid velocity is maximum.
(a) Vena contracta
(b) Critical point
(c) Neutral point
(d) Point of centre of gravity

Water is flowing fully in a circular pipe of diameter 1m with a velocity of 10 m/s if loss of head due to friction is 0.2m for a pipe length of 10m what is the coefficient of friction (assume acceleration due to gravity g=10 meter per second square)
(a) 0.01
(b) 0.001
(c) 0.1
(d) 0.02

In Lithium-Bromide refrigeration system, Lithium-Bromide is used as
(a) Primary refrigerant
(b) Secondary refrigerant
(c) Absorbent
(d) None of the above

Find the wrong among the following properties of ideal refrigerant
(a) Low boiling point
(b) Low freezing point
(c) Low Latent Heat
(d) Good chemical stability

Chemical formula for ‘R22’ refrigerant
(a) Mono chloro di fluoro methane
(b) Tri chloro mono fluoro methane
(c) Di chloro mono fluoro methane
(d) Di chloro di fluoro methane

Relative humidity is defined as
(a) Weight of water vapour per unit weight of dry air
(b) Weight of water vapour per unit volume of air
(c) Mass of water vapour in a given volume of air to mass of water vapour if the air is saturated at the same temperature
(d) None of the above

Normally, the following condenser is used in big refrigeration system of air conditioning plants
(a) Double tube condenser
(b) Shell and tube condenser
(c) Shell and coil condenser
(d) Evaporative condenser