Pick out the wrong statement.
A. The equivalent stiffness of two springs (of equal stiffness 'S') in series is 2 S while in parallel is 2S
B. For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire diameter)
C. Crushing load or columns is less than the buckling load
D. Modulus of resilience is proportional to (stress at elastic limit)2
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Boiler tube size is specified by its thickness and __________ diameter.
A. Outside
B. Inside
C. Mean
D. None of these
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Break even point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
A. Only
B. Plus variable cost
C. Plus overhead cost
D. Plus selling expenses
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Direct conversion of thermal energy to electrical energy is facilitated by the
A. Fuel cells
B. Photo voltaic cell
C. Magneto hydrodynamic generator
D. None of these
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Which of the following approaches the ideal gas behaviour most closely?
A. Wet steam
B. Saturated steam
C. Superheated steam
D. Saturated water
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Heat treatment of steel is done mainly to change its
A. Mechanical properties
B. Physical properties
C. Chemical composition
D. All of the above
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Fire on fuel oil lines can be extinguished by
A. Foam
B. Steam
C. Water
D. Carbon dioxide
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__________ property of steel increases by addition of large amount of silicon in it.
A. Mechanical
B. Machining
C. Magnetic
D. Refractory
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LASER
A. Stands for Light Amplification by Stimulated Emission of Radiation
B. Has the same intensity as visible light
C. Can't be used for cutting metals
D. None of these
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Laser is a device to produce
A. Gamma rays
B. Microwaves
C. A beam of white light
D. A beam of coherent light
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Corona discharge is related to the operation of a/an
A. Induction motor
B. Electrostatic precipitator
C. Fast breeder reactor
D. Magneto hydrodynamic generator (MHD)
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Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
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Upto the critical radius of insulation, added insulation, will
A. Increase the heat loss
B. Decrease heat loss and will have no effect beyond that
C. Decrease heat flux
D. Reduce convection heat loss compared to conduction heat less
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For grinding of softer materials, the grinding wheel should have __________ grain size.
A. Finer
B. Coarser
C. Medium
D. Any type of
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Chromium molybdenum steel can not be welded using __________ welding.
A. Thermit
B. Electrical resistance
C. Oxy-acetylene
D. Any of these
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Titanium can be easily welded using __________ welding.
A. Submerged arc
B. TIG
C. Shielded metal arc
D. Electroslag
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The most suitable material for die casting is
A. Iron
B. Copper
C. Steel
D. Nickel
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Lead pencil contains
A. Graphite
B. Lead sulphide
C. Lead
D. Both B & C
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The refractory lining of the bottom in a basic electric arc furnace is made of
A. Silica
B. Alumina
C. Magnesia
D. Fireclay
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In TIG welding, thoriated tungsten electrodes are used, because it
A. Has higher current carraying capacity
B. Has better electron emissivity
C. Is stronger than ordinary tungsten
D. Is easy to prepare
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