Related Questions
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4
Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
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4
The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
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4
'Cryogenics' is concerned with the generation & use of low temperature in the range of
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4
In the blast furnace, incorporation of water vapour in the blast gives the following effect.
A. Increases the reducing potential of the gas
B. Increases the flame temperature
C. No significant change occurs
D. Increases the hydrogen content in the metal
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4
Maximum permissible air velocity in pipelines is about __________ metre/second.
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4
Main constituent of bone ash is
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4
Transformer cores are normally made from
C. Grain oriented Fe-Si alloy
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4
Factor of safety is the ratio of the __________ stress to the working stress.
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4
In multipass welds, shot peening is done after each pass to
A. Close the surface porosity
B. Break the continuity of columnar grains
D. Introduce texture in the weld
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4
In practice, the compression ratio of compression-ignition (CI) engine ranges from
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4
As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint.
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A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.
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4
Which of the following terminology is used for the temperature at which new grains are formed in a metal?
B. Lower critical temperature
C. Recrystallisation temperature
D. Upper critical temperature
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4
Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
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4
__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
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Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
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4
Property responsible for the talcum powder to cling to the skin is the
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4
Pick out the wrong statement.
A. Cold cracking of a weld is due to the presence of hydrogen gas in the weld
B. True stress is given by, σ = σE (1 + εE), where σE and εE are engineering stress and engineering strain respectively
C. Phosphorous can be easily recovered in the iron blast furnace
D. High residual stress at the surface is beneficial for fatigue properties of a material
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4
The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)
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4
On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.
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4
When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the
A. Partial pressure of water vapour is less than the total pressure
B. Humidity is < 100% & dew point temperature of air has not reached
C. Dew point temperature of air has not reached & air is not saturated fully
D. Air is fully saturated
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4
Larger length & diameter water pipes are made by
A. Electrical resistance welding
C. Semi-centrifugal casting
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4
Shaft/rotor speed is most accurately measured by a
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4
The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the
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4
The following type of bonding is strongly directional in solids.
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4
The dimensional formula of bulk modulus of elasticity is same as that of the
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4
In Imperial Smelting Process for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following:
A. Jet of water at high pressure
C. Mixture of water and air
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4
Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of
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4
Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
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Fire refining process is employed in case of