Main constituent of bone ash is
Ammonium phosphate
Calcium phosphate
Animal charcoal
Ammonium sulphate
Correct Answer :
B. Calcium phosphate
Related Questions
Addition of __________ to steel does not help in improving its machinability.
Sulphur
Silicon
Lead
Phosphorous
The atmospheric temperature during melting of ice/snow (in the atmosphere)
Decreases
Increases
Remain same
May increase or decrease; depends on the altitude where snow melts
Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
Bomb
Throttling
Junker's
Boy's
The most suitable material for die casting is
Iron
Copper
Steel
Nickel
Wrought iron is never shaped by
Casting
Cold working
Forging
Welding
Recrystallisation temperature of steel is __________ °C.
50
300
500
800
Which of the following is not used as a bearing material?
Copper-lead alloys
Babbitts
Bronzes
Cermets
In __________ process, there is an increase in entropy with no degradation of energy.
Isothermal expansion
Isochoric heat addition
Polytropic expansion
Isobaric heat addition
__________ 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
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
The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.
140
180
240
280
Energy of the sun arises mainly from __________ reactions.
Fusion
Fission
Combustion
None of these
Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.
Horizontal
Vertical
Inclined
Any
Consumable electrodes are used in the __________ welding.
Gas
Arc
Thermit
Resistance
Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?
Nitrogen oxides
Hydrocarbons
Both 'a' & 'b'
Carbon monoxide
Electrochemical corrosion can occur, only if __________ is present in contact with metal.
Air
Oxygen
Liquid medium
Gaseous medium
Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
0.8
7.8
200
10000
Quartz is a __________ material.
Diamagnetic
Ferromagnetic
Ferroelectric
Piezoelectric
Iron content in Indian iron ore is about __________ percent.
80-85
60-65
40-45
20-25
Minimum thermal efficiency of a steam boiler may be around __________ percent
25
45
65
20
Hot & cold working of material causes its __________ deformation.
Visco-elastic
Isotropic
Elastic
Plastic
Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
Cold
Work
Age
Induction
X-rays are
Positively charged
Negatively charged
Neutral
Of higher wavelength than visible light
The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
Is as light as possible
Has very high C.O.P.
Employs minimum quantity of refrigerant
Consumer minimum horse power
Which of the following phenomenon will exhibit the minimum heat transfer?
Boiling
Forced convection in air
Free convection in air
Conduction in air
Function of gear box is to
Reduce the speed
Obtain variable speed
Increase the speed
Produce high torque
Hooke's law
Applies to elastic deformation
Applies beyond limit of proportionality in stress-strain curve
States that stress is inversely proportional to strain upto elastic limit
None of these
Corrosion of metals cannot be prevented by its
Tempering
Chromising
Aluminising
Alloying
__________ fluid force is not considered in the Navier-Stokes equation.
Turbulent
Viscous
Gravity
Pressure
Good design of the casing of a centrifugal pump aims at minimising the
Cavitation
Frictional losses
Kinetic energy loss
Static head