Fibre reinforced plastic (FRP) are
Made of glass fibre and thermoplastic resins
Anisotropic
Made of thermosetting resin and glass fibre
Both 'b' & 'c'
Correct Answer :
D. Both 'b' & 'c'
Related Questions
Highest cutting speed is achieved by the __________ tool material.
High speed steel
Carbide
Cast alloy
Plain carbon steel
Pick out the wrong statement.
For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1
For calculating forces and efficiency of riveted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work
Longitudinal joint is normally made butt joint to maintain the circularity of the vessel
Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm
Laser welding is widely employed in the __________ industries.
Electronic
Structural
Process
Heavy
Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
X-rays
γ-rays
α-rays
β-rays
Diamagnetic materials
Are magnetised by eddy currents only
Are non-magnetic and cannot be magnetised
Are magnetised in direction opposite to the magnetic field
Can be magnetised in one direction only
Hydro-cyclone is a
Crusher
wet classifier
Dry classifier
Magnetic separator
Hot & cold working of material causes its __________ deformation.
Visco-elastic
Isotropic
Elastic
Plastic
Damage to metal surface by mechanical action is called
Pitting
Corrosion
Erosion
None of these
Pick out the correct combination about the role of various additives used in polymers.
Plasticiser: increases the polymer strength
Heat stabiliser: increases the maximum service temperature
Fillers: Does not affect the property of polymer but increases its weight
Lubricants: increases the flexibility of polymers
Which of the following is prone to cup and cone fracture?
Cast iron
Soft brass
Round specimen of ductile metal
Flat tensile specimen of ductile metal
The most commonly used moderator in nuclear power plants is
Graphite
Light water
Heavy water
Beryllium
Which of the following is not a characteristic observed in material failure by fatigue fracture?
Plastic deformation of material does not occur
Initiation of crack from below the surface does not occur
Initiation of crack occurs on the surface of the machine part
Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Unit of surface tension in S.I. unit is
Watt/m
Joule/
Newton/
Joule/m
The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the
Work hardening
Bauschinger effect
Creeping effect
Stress recovery effect
Corona discharge is related to the operation of a/an
Induction motor
Electrostatic precipitator
Fast breeder reactor
Magneto hydrodynamic generator (MHD)
Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
Achieve very high purity of aluminium (99.9%)
Keep the electrolyte in liquid condition by the generation of heat
Electrolytically dissociate alumina
Both (B) & (C)
Optical activity is a/an __________ property.
Additive
Constitutive
Both (A) & (B)
Neither (A) nor (B)
The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
Ambient
Dry bulb
Dew point
Wet bulb
Yield strength of a polycrystalline metal with an average grain size d, is proportional to
d1/2
d-1/2
d
d-1
The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.
Carbon
Manganese
Both 'a' nor 'b'
Neither 'a' nor 'b'
If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
23
23/2
25/2
21/3
Silicon percentage in silicon steel used for electrical equipments is about
1
4.0
8
14
Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are:
Nickel, cobalt & chromium
Tungsten, chromium & cobalt
Manganese, chromium & cobalt
Tungsten, molybdenum & nickel
Consumable electrodes are used in the __________ welding.
Gas
Arc
Thermit
Resistance
Hot extrusion process is not used for making
Cast iron pipe for domestic water supply
Aluminium curtain rods
Stainless steel tubes used in furnitures
Any of these
Percentage of differential pressure lost in a Venturimeter with a tapering of 15° may be about
1
10
25
50
Most of the phosphorous present in the blast furnace burden enters into
Hot metal
Flue gases
Slag
Refractory lining
A material being tested for endurance strength is subjected to the __________ load.
Impact
Completely reversed
Dynamic
Static & dynamic
A dense structure of grinding wheel is not used for the
Ductile material
Hard materials
Brittle materials
Finishing cuts
An atom bomb works on the principle of
Nuclear fission
Nuclear fusion
Both the nuclear fission & fusion
Ionisation