Related Questions

An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Insulating refractories should have
A High porosity
B Low thermal conductivity
C Both A & B
D Neither A nor B
Porosity of fireclay refractories is __________ percent.
A 5-10
B 10-25
C 25-35
D 35-50
With decrease in porosity, the __________ of the refractories decreases.
A Strength
B Thermal conductivity
C Spalling resistance
D None of these
A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
A Increase
B Decrease
C Remain unaffected
D May increase or decrease; depends on the thickness of each layer
Brittleness induced due to the presence of sulphur in steel can be reduced by adding
A Manganese
B Magnesium
C Vanadium
D Copper
'Stress-induced amnesia strikes the patient apparently without warning and the memory loss can be as complete as is induced by physical trauma.' which correction should be made to this sentence?
A replace 'strikes' with 'contracts'
B replace 'is' with 'that'
C remove 'apparently'
D change 'by' to 'in'
According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of
A Motion of conductor
B Lines of force
C Either of the above
D None of the above
The stress induced in a body, when suddenly loaded, is _________ the stress induced when the same load is applied gradually.
A Equal to
B One-half
C Twice
D Four times

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