QUESTIONS CARRY TWO MARKS EACH.
A carnot refrigerator has a cop of 6. What is the ratio of the lower to the higher absolute temperature ?
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Solution
QUESTIONS CARRY TWO MARKS EACH.
A vibrating body is supported by six isolators each having stiffnesses 30,000 N/m and 6 dash pots having dampimg factor as 300 N-sec/m. The vibrating body is to be isolated by arotating device having an amplitude of 0.06 mm at 500 rpm. Take m= 20 kg, then a amplitude of vibration of the body will be …………….
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Solution
QUESTIONS CARRY TWO MARKS EACH.
The molecular weight of vinyl chloride is 6.25. Thus the molecular weight of a poly vinyl chloride with a degree of polymerization of 20,000 will be ……………. × 104.
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Solution
QUESTIONS CARRY TWO MARKS EACH.
A rod of material (E= 200 × 103 MPa) and a= 10–3mm/mm°C is fixed at both ends. It is uniformly heated such that the increase in temperature is 30°C. The stress developed in rod is …………….
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Solution
Given: E= 200 × 103MPa
α = 10–3mm/mm°C
ΔT= 30°C
Now,stres sinduced in rod(σe) = E α ΔT
= 200 × 103 × 10–3× 30 = 6000 N/mm2
QUESTIONS CARRY TWO MARKS EACH.
A molten metal drop of radius 8 mm was found to solidify in 10 seconds. Then the time in which a similar drop of radius 16 mm solidify will be…………….
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Solution
QUESTIONS CARRY TWO MARKS EACH.
The specification of an assembly are given as follows:
1.Hole size : 32.000\(_{0.000}^{+0.050}\) 2.Shaft size : 32.000\(_{0.000}^{+0.040}\)
Then the maximum clearance in assembly will be …………….
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Solution
Maximum clearance = Maximum hole size– Minimum shaft size
= (32.000 + 0.050) – (32.000 –0.010)
v= 32.05 – 31.99 = 0.06 mm
QUESTIONS CARRY TWO MARKS EACH.
An NC machine tool has a motor whose specification sensivity is 5° / pulse. Pitch of the lead screw is 3.6 mm.Then the expected positioning accuracy will be…………….
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Solution
QUESTIONS CARRY TWO MARKS EACH.
A particle is projected with a velocity of 39 m/s at an angle of 30° with horizontal. It will move at right angle to the direction of projection, after the time :(Take g= 10m/s)
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Solution
QUESTIONS CARRY TWO MARKS EACH.
For the network shown in figure, the variance along the critical path is 4
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Solution
QUESTIONS CARRY TWO MARKS EACH.
A capston lathe is used to mass-produce, in batches of 200, a particular component. The direct material cost is `4 per piece, the direct labour cost is ₹3 per piece and the over head costs are 400% of labour costs. The production cost per piece will be …………….
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Solution