Related Questions

A hammer and a screwdriver currently have the same price. If the price of a hammer rises by 6% and the price of a screwdriver goes up by 4%, how much more will it cost to buy 1 hammer and 1 screwdriver?
A 5%
B 10%
C 24%
D 40%
Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the
A Pipe length
B Fluid velocity in the pipe
C Time taken to close the valve
D All of the above
To resist spalling tendency, a refractory should have
A Greater diffusivity
B Low specific heat
C Low thermal co-efficient of expansion
D All of the above
Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
A 770
B 570
C 270
D 70
Spalling resistance of a refractory can not be increased by
A Increasing its porosity
B Using a coarser grog during its manufacture
C Decreasing its thermal co-efficient of expansion
D Making it denser
Thermal spalling mainly occurs during __________ of furnaces.
A Cooling down
B Warming up
C Both A & B
D Neither A nor B
With increase in the porosity, thermal spalling resistance of fireclay brick
A increases
B decreases
C remains same
D may increase or decrease
Spalling of a refractory means its
A Softening
B Fracture due to uneven expansion at high temperature
C Resistancce to compressive loads
D Resistance to chemical action of gases and molten fluxes
Spalling tendency of refractories is reduced by increasing its
A Porosity
B Specific gravity
C Thermal conductivity
D Strength
The hammer ___________ can pull out nails .
A that I'm looking
B for which I'm looking for
C for what I'm looking
D for which I'm looking

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