A man in a balloon rising vertically with an acceleration of 5.9 m/s2 releases a ball 4 sec after the balloon is let go from ground. The greatest height above the ground reached by the ball is ________
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Solution
Match List-I with List-II
List-I List-II
A.± 3s1. 0.3413
B.± 2s2. 0.6826
C.± s3. 0.9973
4.0.9545
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Solution
Given that the peripheral speed of grinding wheel of 100 mm diameter for cylindrical grinding of a steel work-piece is 30 m/s. The estimated rotational speed of the grinding wheel in rpm will be ________
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Solution
In the figure given below, are members are equal in length and joints are pinned and smooth. The reaction at V will be?
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Solution
The equation of motion for damped viscous vibration is 3x + 9x + 27x = 0. The damping factor will be ________
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Solution
Consider the three activities of CPM network given above. Earliest and latest occurence times of three events are given on the hodes. The total float on the activity 20-30 in ________
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Solution
Total float on activity (20 → 30) = 23 – (10 + 8)
= 23 – 18 = 5
The following data is given performing orthogonal cutting of a mild steel specimen :
Cutting speed = 27 m/min.
Rake angle = 10°
Depth of cut = 0.28 mm
Chip thickness = 0.6 mm
Cutting force = 825 N Thrust force = 462 N
Then, the friction angle during machining will be________
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Solution
The radius of a cutting tool is 3.0 mm, the feed rate to obtain the the oritical surface roughness of Ra= 8 µm will be ________
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Solution
Radius of cutting tool (R) = 3 mm
Surface roughness(Ra) =8 mm
Using the following relation,
Feed rate (F) =\(\sqrt{4\times R_{a}\times R}\)
\(\sqrt{4\times8\times 3}=9.8\: mm\)
A rod of length 1m is sliding in a corner as shown in figure. At an instant, when the rod makes an angle of 60° with the horizontal plane, the downward velocity of point P is 1m/s. What is the angular velocity of this rod at this instant?
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Solution
The effect of centering error when the tool is set above the centre line as shown in the figure results in :
1.increase in rake angle
2.reductionin rake angle
3.increase in clearance angle
4.reduction in clearance angle
Which of these statements is/are correct ?
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Solution
It is obvious th at change in clearance = Previous clearance – α
New rake anlge = α + sin–1(h/R)