Number of electrons in the outermost shell of a semi-conductor material is
Select an option to see the answer and solution.
Encyclopaedia of Chemical Technology has been
A. Authored by Kirk Othmer
B. Edited by Perry and Chilton
C. Edited by Kirk Othmer
D. Authored by Perry and Chilton
Select an option to see the answer and solution.
__________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten.
A. Stellite
B. High speed steel
C. Cermet
D. Alnico
Select an option to see the answer and solution.
The hydraulic radius of a circular pipe of diameter 'd' flowing full is
Select an option to see the answer and solution.
Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
A. Invar
B. Hastealloy
C. Duralumin
D. Monel metal
Select an option to see the answer and solution.
Material of construction of surveying metallic tapes is __________ which has low coefficient of expansion & enough strength.
A. Constantan
B. Invar
C. Pewter metal
D. Monel metal
Select an option to see the answer and solution.
Softening of hardned steel is done by its
A. Normalising
B. Tempering
C. Annealing
D. Carburising
Select an option to see the answer and solution.
The atmospheric temperature during melting of ice/snow (in the atmosphere)
A. Decreases
B. Increases
C. Remains same
D. May increase or decrease ; depends on the altitude where snow melts
Select an option to see the answer and solution.
Dialysis is the process of separating substances in the
A. Colloidal state from those present in the true solutions
B. Colloidal state from those present in the suspensions
C. Suspension from those present in the solutions
D. None of these
Select an option to see the answer and solution.
The type of pump used for lifting large quantity of sewage is a __________ pump.
A. Gear
B. Centrifugal
C. Reciprocating
D. Plunger
Select an option to see the answer and solution.
Presence of sulphur in steel reduces the
A. Hardness
B. Grain size
C. Tensile strength
D. Toughness & transverse ductility
Select an option to see the answer and solution.
For the Stoke's law to be valid in the case of a falling sphere in a fluid, the
A. Reynolds number (based on sphere diameter) should be < 1
B. Flow around the sphere should be in turbulent region
C. Sphere must be metallic
D. Fluid density should be constant
Select an option to see the answer and solution.
'Ice point' is designated on Farenhite temperature scale by
Select an option to see the answer and solution.
Safety matches is produced using
A. Red phosphorus
B. Yellow phosphorus
C. Black phosphorus
D. Elemental sulphur
Select an option to see the answer and solution.
A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2 . The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m2 °C.
Select an option to see the answer and solution.
Material having negative co-efficient of linear expansion is
A. Copper
B. Aluminium
C. Rubber
D. Nickel
Select an option to see the answer and solution.
Fine grained steels have
A. High brittleness
B. Higher tendency to distort
C. High ductility
D. None of these
Select an option to see the answer and solution.
Floating control action
A. Moves the final control element at constant speed in either direction in response to an error signal
B. Changes the position of the final control element from on to off
C. Is used to counteract rapid load changes
D. None of these
Select an option to see the answer and solution.
Styrofoam is the commercial name of
A. Polyurathene
B. Polystyrene
C. Polyacrylonitrile
D. Polybutadiene
Select an option to see the answer and solution.
Which of the following is an inedible oil ?
A. Corn oil
B. Tallow oil
C. Olive oil
D. Cotton seed oil
Select an option to see the answer and solution.