Related Questions
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4
With increase in compression ratio, the volumetric efficiency of air compressor
D. May increase or decrease (depends on the suction pressure)
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4
Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is
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4
Spark plug is provided in a/an
A. Engine having carburettor
C. Compression ignition engine
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4
The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
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4
__________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.
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4
The same volume of all gases is representative of their
C. Gas characteristic constants
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4
Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
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4
The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C.
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4
Iron content in Indian iron ore is about __________ percent.
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4
Cold chisel & hammers are made of
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4
Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.
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4
What is the percentage of chromium in 18-4-1 high speed steel?
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4
In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that
A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller
B. Maintaining vacuum on tube side is more difficult than that on the shell side
C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam
D. Condenser can act as a storage unit for condensed steam
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4
All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.
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4
Metalloids
A. Are good conductor of heat & electricity
B. Act as electron donors with metals & as electron acceptor with non-metals
C. Are not necessarily solids at room temperature
D. Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
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4
In extrusion of metals, which of the following statement is true?
A. Speed of the extruded material is same as that of ram speed
B. Redundant work is a function of the die angle
C. Relative motion between the billet surface and the container wall is always present
D. Hollow ram is used for indirect extrusion
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4
Plasma is
A. A high temperature neutral gas
B. Nothing but ionised gas
C. A source of steady and highest controllable pressure
D. Formed at very low temperature
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4
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)
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Spheroidising of a material is a/an __________ process.
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Factor of safety is the ratio of the __________ stress to the working stress.
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The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.
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4
Absolute zero pressure can be attained at a temperature of
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4
__________ the exhaust gas is an indication of the incomplete combustion of fuel.
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4
The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the
A. Pipe roughness & pipe diameter
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4
Spherical shape of mercury droplets is due to its
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4
Main constituent of bone ash is
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Silicon percentage in the silicon steel used for electrical appliances/equipments is
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4
Galvanic corrosion cannot be prevented by
C. Usage of largest possible anodic area
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4
For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
D. Increases to a maximum before decreasing
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4
Dislocation cross-slip is difficult in those materials, which have
A. Large number of slip systems
B. High work hardening rate
D. Low stacking fault energy