Related Questions
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4
A form of stress corrosion failure termed as 'season cracking' is generally observed in
A. Thermosetting polymers
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4
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.
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4
Notched bar test is used for testing the __________ of a material.
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4
Thermal efficiency of an internal combustion engine is around __________ percent.
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4
With increase in annealing temperature, the following defect density decreases.
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4
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
A. Parallel flow with equal heat capacities
B. Counter flow with equal heat capacities
C. Counter flow with unequal heat capacities
D. Parallel flow with unequal heat capacities
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4
Biological shield in a nuclear reactor is generally provided to protect against the
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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
Carnot cycle is also termed as the constant __________ cycle in thermodynamics.
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4
Cemented carbide tools are not suitable for cutting
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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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4
Work done by a/an __________ process is determined by ∫p. dv
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4
Maraging steels derive their strength from the following mechanism:
A. A fine, highly dislocated and strong martensite
B. Fine dispersions of inter-metallic of Fe, Ni, Ti etc
C. Fine dispersions of alloy carbides in a ferrite matrix
D. Fine dispersions of C nucleated on dislocations in austenite
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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
Annealing of cast iron
A. Softens it to facilitate machining
B. Decreases the free carbon
C. Increases the strength
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4
For preparation of porous bearings by powder metallurgy, preferred particle shape is
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4
Preheating before welding is done to
B. Burn oil & grease sticking to plate surfaces
C. Avoid plate distortion
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4
Which of the following materials has the maximum shrinkage allowance?
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4
Dislocations are __________ defects.
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4
To counteract the bad effects of strain hardening on a cold formed part, it must be
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4
Super conduction in metals is observed at a temperature of __________ °K.
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4
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.
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4
Which of the following materials has the poorest electrical conductivity?
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4
The 'laughing gas' is
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4
Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________ kJ.
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4
Pick out the wrong statement.
A. For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1
B. For calculating forces and efficiency of riveted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work
C. Longitudinal joint is normally made butt joint to maintain the circularity of the vessel
D. Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm
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4
More than 95% of __________ is present in corundum.
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4
Which of the following phenomenon/ phenomena is/are diffusion controlled?
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4
A material is capable of resisting softening at high temperature, because of its property termed as
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4
A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.