# A box contains 5 black and 5 red balls. Two balls are randomly picked one after another from the box, without replacement. The probability for both balls being red is

1.  90

2.  5

3.  90

4.  9

4

9

Explanation :
No Explanation available for this question

# A truss consists of horizontal members (AC, CD, DB and EF) and vertical members (CE and DE) having length 1 each. The members AE, DE and BF are inclined at 45° to the horizontal. For the uniformly distributed load ‘p’ per unit length on the member EF of the truss shown in figure given below, the force in the member CD is

1.  Ρl/2

2.   Pl

3.  0

4.  2pl/3

4

Ρl/2

Explanation :
No Explanation available for this question

# A project consists of activities A to M shown in the net in the following figure with the duration of the activities marked in days The project can be completed

1.  Between 18,19 days

2.  Between 20,22 days

3.  Between 24,26 days

4.  Between 60,70 days

4

Between 24,26 days

Explanation :
No Explanation available for this question

# A bullet of mass ‘m’ travels at a very high velocity v (as shown in the figure) and gets embedded inside the block of mass ‘M’ initially at rest on a rough horizontal floor. The block with the bullet is seen to move a distance ‘s’ along the floor. Assuming t to be the coefficient to kinetic friction between the block and the floor and ‘g’ the acceleration due to gravity what is the velocity v of the bullet

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# A simply supported laterally loaded beam was found to deflect more than a specified value. Which of the following measures will reduce the deflection

1.  Increase the area moment of inertia

2.  Increase the span of the beam

3.   Select a different material having lesser modulus of elasticity

4.  Magnitude of the load to be increased

4

Increase the area moment of inertia

Explanation :
No Explanation available for this question

# Match the following: P    Curtis 1. Reaction steam turbine Q. rateau 2. Gas Turbine R. Kaplan 3. Velocity compounding S. Francis 4. Pressure compounding   5. Impulse water turbine   6. Axial Turbine   7. Mixed Flow Turbine   8. Centrifugal pump

1.  P-2  Q-1  R-7  S-6

2.  P-3  Q-1  R-5 S-7

3.  P-1  Q-3  R-1 S-5

4.  P-3 Q-4 R-7 S-6

4

P-3 Q-4 R-7 S-6

Explanation :
No Explanation available for this question

# A shaft subjected to torsion experiences a pure shear stress t on the surface. The maximum principal stress on the surface, which is at 45° to the axis, will have a value

1.  t cos 450

2.  2t cos 450

3.   t cos2 45°

4.  2t sin 45 cos 45°

4

2t sin 45 cos 45°

Explanation :
No Explanation available for this question

# For a certain engine having an average speed of 1200 rpm, a flywheel approximated as a solid disc, is required for keeping the fluctuation of speed within 2% about the average speed.The fluctuation of kinetic energy per cycle is found to be 2k]. What is the least possible mass of the flywheel if its diameter is not exceed im

1.  40 kg

2.  51 kg

3.  62 kg

4.  73 kg

4

51 kg

Explanation :
No Explanation available for this question

# A flexible rotor-shaft system comprises of a 10 kg rotor disc placed in the middle of a mass-less shaft of diameter 30 mm and length 500mm between bearings (shaft is being taken mass-less as the equivalent mass of the shaft is included in the rotor mass) mounted at the ends. The bearings are assumed to simulate simply supported boundary conditions. The shaft is made of steel for which the value of E is 2.lxlO11Pa. What is the critical speed of rotation of the shaft

1.  60 Hz

2.   90 Hz

3.  135 Hz

4.  180 Hz

4

90 Hz

Explanation :
No Explanation available for this question

1.  4T/ld

2.  16T/ld2

3.  8T/ld2

4.  16T/πd3

4