A flywheel connected to a punching machine has to supply energy of 400 Nm while running at a mean angular speed of 20 radians/s. If the total fluctuation of speed is not to exceed ±2% , the mass moment of inertia of the flywheel in Kg-m2 is

1. 25

2. 50

3. 100

4. 125

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Correct Answer :

Explanation :
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Area of a square is given to be S. If the sides are doubled, then the new area will be

1. 4s

2. 2s

3. S/2

4. S2

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Correct Answer :

Explanation :
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A compound gear train with gears P, Q, R and S has number of teeth 20, 40,15 and 20, respectively. Gears Q and R are mounted on the same shaft as shown in the figure below. The diameter of the gear Q is twice that of the gear R. If the module of the gear R is 2 mm, the center distance in mm between gears P and S is

1. 40

2. 80

3. 120

4. 160

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Correct Answer :

Explanation :
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A pin jointed uniform rigid rod of weight W and Length L is supported horizontally by an external force F as shown in the figure below. The force F is suddenly removed. At the instant of force removal, the magnitude of vertical reaction developed at the support is

1. Zero

2. w/4

3. w/2

4. w

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Correct Answer :

w/4

Explanation :
No Explanation available for this question

Two cutting tools are being compared for a machining operation.The tool life equations are: Carbide tool: VT1.6=3000 HSS tool: VT0.6=200 Where V is the cutting speed in m/min and T is the tool life in min. The carbide toll will provide higher tool life if the cutting speed in m/min exceeds

1. 15.0

2. 39.4

3. 49.3

4. 60.0

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Correct Answer :

39.4

Explanation :
No Explanation available for this question

In a CAD package, mirror image of a 2D point P(5, 10) is to be obtained about a line which passes through the origin and makes an angle of 45° counterlockwise with the X-axis. The coordinates of the transformed point will be

1. (7.5, 5)

2. (10, 5)

3. (7.5, -5)

4. (10, -5)

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Correct Answer :

(10, 5)

Explanation :
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A linear programming problem is shown below: Maximize 3x + 7y 3X+7Y≤10 Subject to 4x+6y≤8 x,y ≥0 It has

1. an unbounded objective function

2. exactly one optimal solution

3. exactly two optimal solutions

4. infinitely many optimal solutions

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Correct Answer :

exactly one optimal solution

Explanation :
No Explanation available for this question

Cylindrical pins of mm diameter are electroplated in a shop. Thickness of the plating is .Neglecting gage tolerances, the size of the GO gage in mm to inspect the plated components is

1. 25.042

2. 25.052

3. 25.074

4. 25.084

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Correct Answer :

25.052

Explanation :
No Explanation available for this question

During the electrochemical machining (ECM) of iron (atomic weight=56,valency=2) at current of 1000 A with 90% current efficiency, the material removal rate was observed to be 0.26 gm/s. If Titanium (atomic weight = 48, valency=3) is machined by the ECM process at the current of 2000 A with 90% current efficiency, the expected material removal rate in gm/s will be

1. 0.11

2. 0.23

3. 0.30

4. 0.52

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Correct Answer :

0.30

Explanation :
No Explanation available for this question

A single degree of freedom system having mass 1 kg and stiffness 10kN/m initially at rest is subjected to an impulse force of magnitude 5 kN for 10 -4seconds. The amplitude in mm of the resulting free vibration is

1. 0.5

2. 1.0

3. 5.0

4. 10.0

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Correct Answer :

1.0

Explanation :
No Explanation available for this question

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