Related Questions
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4
In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be
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4
__________ of grey cast iron produces white cast iron.
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4
Pick out the correct statement about the condensation.
A. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation
B. Suitable coating or vapour additive is used to promote film wise condensation
C. If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it
D. Reynolds number of condensing liquid is based on its mass flow rate
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4
Cementite is in the lamellar form in the __________ phase of steel.
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4
Metal shots used in shot blasting are made of
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4
The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by
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4
In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.
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4
Shampoos are commercially not available in the form of
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4
Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?
B. Reichert-Meissl value test
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4
In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.
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4
Which of the following equipments is used for liquid dispersion?
C. Bubble cap plate column
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4
Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
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4
Friction factor for fluid flow in pipe does not depend upon the
C. Fluid density & viscosity
D. Mass flow rate of fluid
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4
The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is
D. More but less than the diameter of bolt
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Maximum permissible sulphur content in steel is __________ percent.
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4
There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
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4
__________ is used as a material of construction for the blade of power saw.
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4
As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.
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4
__________ of test specimens is not involved in any hardness testing method.
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4
Which of the following pairs is not correctly matched?
A. Uranium - 233 : Fertile material
B. Binding energy : Mass defect
C. Scattering: Absorption cross-section
D. Number of nucleons : Mass number
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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
During sensible cooling of air, its wet bulb temperature
A. Decreases but dew point remains constant
B. Increases but dew point remains constant
C. Increases & the dew point decreases
D. Decreases & the dew point increases
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4
Material of construction of foundry crucible is
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4
Which of the following is not a principal alloying element for the structural steel?
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4
Normalising of a casting does not
B. Refine its grain structure
D. Improve its mechanical properties
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4
Out of the following, the most malleable material is
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4
Nusselt number/Biot number varies
A. Inversely with thermal conductivity
B. Directly with heat transfer co-efficient
C. Directly with thermal conductivity
D. Inversely with the dimension of the solid
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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 atmospheric temperature during melting of ice/snow (in the atmosphere)
D. May increase or decrease; depends on the altitude where snow melts
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4
Name the safety device used to protect the boiler, when the water level falls below a minimum level.