Related Questions
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4
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
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4
__________ wire is never used for making the heating element.
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4
Dielectric
A. Is an electrical insulating material
B. Of low resistivity is preferred
C. Should have high thermal conductivity
D. Need not defy the corrosive action of chemicals
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4
Holes for riveting purposes should be preferably made by
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4
Particle nature of cathode rays is proved due to the fact that they
A. Travel in a straight line
B. Get deflected by magnetic electric field
D. Heat the exposed material
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4
Basic open hearth furnace (BOF) is not used for producing __________ steel.
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4
Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.
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4
Cold chisel & hammers are made of
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Superheating of steam is done at constant
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Difference at any instant between the value of the controlled variable and the set point is called the
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4
Which of the following is an example of stress corrosion?
A. Season cracking of brass
B. Caustic embrittlement of steel
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4
Spherical shape of mercury droplets is due to its
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4
In electrical resistance welding, distortion results from the use of improper
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Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
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High speed steel tools retain their hardness upto a temperature of __________ °C.
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4
When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively
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4
Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
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4
Gas turbine normally employs a constant __________ cycle.
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4
Auto collimator is used to check
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4
Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
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What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.
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4
The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the
C. Floating control action
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4
In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will
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4
Silicon crystal can be converted to p-type semiconductor by doping with
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4
Fibre glass is a composite material of
A. Glass fibre in a polymer matrix
B. Glass fibre in a metallic matrix
C. Polymer fibre in a glassy matrix
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4
Multistage compression of air as compared to single stage compression offers the advantage of
A. Power saving per unit weight of air delivered
B. Moisture elimination in the inter-stage cooler
C. Increased volumetric efficiency
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4
Alloys having more than 80% copper are generally more
C. Prone to season cracking
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4
Encyclopaedia of Chemical Technology has been
A. Authored by Kirk Othmer
B. Edited by Perry and Chilton
D. Authored by Perry and Chilton
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4
Which one of the following is incombustible?
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Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.