Dielectric
Is an electrical insulating material
Of low resistivity is preferred
Should have high thermal conductivity
Need not defy the corrosive action of chemicals
Correct Answer :
A. Is an electrical insulating material
Related Questions
Specific __________ is a dimensionless quantity.
Heat
Humidity
Weight
None of these
Water-tube boiler is the one, in which
Water passes through tubes and flue gases around it
Tube carrying hot flue gases are immersed in a pool of water
Tubes are placed in vertical position
None of these
__________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material.
Tensile
Fatigue
Impact
None of these
For separating small pieces of metal from engine oil of a car, the best separating technique is the
Chromatography
Evaporation
Filtration
Fractional distillation
Projection welding & stud welding is categorised as the __________ welding.
Pressure
Thermit
Resistance
Arc
Which one of the following is incombustible?
H2
CCl4
C2H2
S
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that
Pure oxygen has been used for combustion
Nitrogen percentage in the fuel is very high
Excess air has been used for combustion
Hydrogen is not present in the fuel
A pycnometer is used for the measurement of
Flow rate of molten metal
Specific gravity of a liquid
Composition of alloys
Concentration of a solution
With decrease in the grain size of a material, its creep resistance
Increases
Decreases
Remain constant
Either (A) or (B); depends on the material
The normal stress is the same in all directions at a point in a fluid, only when the fluid
Is at rest & has zero viscosity
Is frictionless
Fluid layer has no motion relative to an adjacent layer of fluid
is incompressible & frictionless
Batch process is preferred over continuous process, when the
Product yields and quality cannot be achieved in continuous process, because of long residence time
Sales demand of product is not steady
Same equipment cannot be used for several processes of the same nature
All (A), (B) & (C)
Galvanic corrosion cannot be prevented by
Cathodic protection
Anodic protection
Usage of largest possible anodic area
Any one of these
The value of 
for air & most common gases can be safely assumed to be
0.8
1
1.4
1.8
In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is
1
1.4
1.5
Y = Cp/Cv
A jig is used while __________ a hole.
Boring
Counter boring
Drilling
Enlarging
Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?
Elaiden test
Reichert-Meissl value test
Hunter value test
Iodine value test
Shrinkage allowance on pattern is provided to compensate for shrinkage when the
Metal changes from liquid state to solid state at freezing temperature
Solid phase temperature drops from freezing temperature to the room temperature
Liquid metal temperature drops from pouring temperature to room temperature
Liquid metal temperature drops from pouring temperature to freezing temperature
Routing in production, planning & control is concerned with the
Sequence of operation to be performed
Progress of work performed
Authorisation of work to be performed
Balancing of load on machines
Propulsion of rocket follows from the
Newton's second law of motion
Newton's third law of motion
Law of projectiles
Archimedes principle
Liquid nitrogen containers can be made from
Ferritic stainless steel
HSLA steel
Titanium
Austenitic stainless steel
Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation
Pressure falls below the vapour pressure
Pressure becomes very high
Temperature becomes low
All 'a', 'b' & 'c'
Multistage compression of air as compared to single stage compression offers the advantage of
Power saving per unit weight of air delivered
Moisture elimination in the inter-stage cooler
Increased volumetric efficiency
All (A), (B) & (C)
Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.
Hexagonal close, packed (hcp)
Face centred cubic (fcc)
Body centred cubic (bcc)
Simple cubic
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.
Evaporative capacity
Evaporation efficiency
Thermal efficiency
Steam load
Super conduction in metals is observed at a temperature of __________ °K.
<100
>100
About 273
About 373
LVDT used for displacement measurement is a/an __________ transducer.
Passive
Active
Capacitive
None of these
Which of the following has the highest modulus of elasticity (about 7 × 106 kg/cm2)?
High speed steel
Stainless steel
Tungsten carbide
Superalloys
The dew point of moist air becomes __________ with decrease in its relative humidity.
Less than the wet bulb temperature
More than the wet bulb temperature
More than the dry bulb temperature
Equal to wet bulb temperature
Which of the following approaches the ideal gas behaviour most closely?
Wet steam
Saturated steam
Superheated steam
Saturated water
Which of the following is not the function of a volute casing provided in a centrifugal pump?
To reduce the head loss in discharge
To increase the pump efficiency
To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity
To increase the pump discharge rate