An automatic machine accomplishes five operations and they perform operations in 110, 130,140, 145 and 170 seconds at each of its work stations. Then the cycle time of work station will be ________.
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Solution
Maximum time taken to perform the operations out of five operations = 170 seconds.The cycle time is the highest time taken by an individual work station so the cycle time =170 seconds.
The assembly of Hole-shaft specification is described as follows
Then, the maximum possible clearance in the assembly will be ________.
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Solution
Upper limit for hole =27.080
Lower limit for shaft = 27.000 – 0.020 =26.98
Now, the maximum clearance = 27.080 – 26.98
= 0.1 mm
In a rolling operation, thickness of sheet is reduced from 40mm to 25 mm by using 750 mm diameter rolls which are rotating at 140 rpm. Then the roll strip contact length will be ________.
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Solution
Two identical springs labelled (i) and (ii) are arranged as shown in figure given below.
If spring constant is ‘k’ for each of the spring, then the strain energy stored in spring (i) is:
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Solution
Which one of the following statement is correct?
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Solution
For ideal gases, compressibility factor is one.
During steady flow compression process of a gas with mass flow rate of 2 kg/s,increase in specific enthalpy is 15kJ/kg and decreases in K.E is 2 kJ/kg. The rate of heat rejection to environment is 3kw. The power needed to drivea compressor will be ________.
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Solution
Two large plates grey plates with a small gap, exchange radiation at the rate of 1000 w/m2. When their emissivities are 0.5 each. By coating one plate, its emissivity is reduced to 0.25. Temperatures remain each angled, then the new rate of heat exchange will be ________.
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Solution
A 1 ton capacity water cooler cools water steadily from 35°C to 20°C. The specific heat of water = 4.18 kJ/kg-k. Then the water flow rate will be ________.
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Solution
In a system, metabolic rate =M, work done by man = w, rate of convective,radiative,evaporative heat losses = Q, rate of heat storage = s.Then heat exchange between man and his environment is:
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Solution
For thermal comfort, It is a situation which is maintained when the heat generated by the human metabolism is allowed to dissipate, thus it maintains thermal equilibrium including its surroundings.
A circular cylinder of 400 mm diameter is rotated about its axis in a stream of water having a uniform velocity of 4m/s.When both of the stagnation points coincide, the lift force experienced by the cylinder is ________.
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Solution