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NLC Technical Quiz 24
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Question 1
Hardenability of steel is a measure of ________.
Question 2
Oil of viscosity 0.15 Pa.s and specific gravity 0.90, flows through a horizontal pipe of 30 mm diameter. If the pressure drop per meter length of the pipe is 15 kPa, determine the shear stress at the pipe wall.
Question 3
Consider a plane wall of 100 mm thickness and 100 W/m-K of thermal conductivity. Steady state conditions exists with 
and 
. What will be the heat flux 
and the temperature gradient for the plane wall?
and . What will be the heat flux and the temperature gradient for the plane wall?Question 4
A PERT project has 2 activities, A and B. The optimistic times, most likely times and the pessimistic times are as follows:
The ratio of the expected time for 2 activities A: B is 1: 2. The most likely time (x), of activity A is?
The ratio of the expected time for 2 activities A: B is 1: 2. The most likely time (x), of activity A is?
Question 5
A spur gear pair with 200 full-depth involute profile transmits 3.5 kW power. The pinion rotates at 700 rpm and has a pitch circle diameter of 100 mm . Assuming single point of contact between the gears, the total force acting on the Spur gear tooth (in kN) is ________.
Question 6
In the full molding (cavity less) the mould and the pattern are respectively _________.
Question 7
A thin cylinder of inner radius 500 mm and thickness 10 mm is subjected to an internal pressure of 5 MPa. The average circumferential (hoop) stress in MPa is _________.
Question 8
The variation in centre distance in involute gear caused due to vibration doesn’t violate the law of gearing(Velocity ratio remains constant). The reason for this phenomenon is _________.
Question 9
F or water at 23℃, dps⁄dTs = 0.189 kPa⁄K (ps is the saturation pressure in kPa and Ts is the saturation temperature in K) and the specific volume of dry saturated vapour is 43.38 m3/kg. Assume that the specific volume of liquid is negligible in comparison with that of vapour. Using the Clausius-Clapeyron equation, an estimate of the enthalpy of evaporation of water at 23℃(in kJ/kg) is __________
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ESE & GATE MEGeneralNov 18ESE & GATE ME
