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NLC Technical Quiz 41
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Question 1
Among the given categories of materials, the one most suitable for brazing of steel sheets is :
Question 2
A vibrating system consists of mass of 50 kg, a spring with stiffness of 30 kN/m and a damper. If damping is 20% of the critical value, the natural frequency of damped vibrations will be
Question 3
It is desired to increase the heat dissipation rate from the surface of an electronic device of spherical shape of 5 mm radius exposed to convection with h = 10 W/m2K by encasing it in a spherical sheath of conductivity 0.04 W/mK. For maximum heat flow, the critical diameter of the sheath shall be __________.
Question 4
In an internal combustion engine, during the compression stroke the heat rejected to the cooling water is 50 kJ/kg and the work input is 100 kJ/kg. What is the change in internal energy of the working fluid ?
Question 5
In a strained material one of the principle stress is twice the other. The maximum shear stress in the same case is τmax, then what is the maximum value of principal stress
Question 6
A solid cast iron disk, 1 m in diameter and 0.2 m thick is used as a flywheel. If is rotating at 350 rpm. It is brought to rest in 1.5 s by means of a brake. It the mass density of cast iron is 7200 kg/m3, the torque exerted by the brake will be nearly
Question 7
The diameter of droplet is 0.05mm. What is the intensity of the pressure (N/sq.cm) developed in the droplet by surface tension of 0.00005 N/mm?
Question 8
An economizer in a steam generator performs the function of preheating the
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ESE & GATE MEGeneralAug 18ESE & GATE ME
