34) Instantaneous center is at infinity when the angular velocity is

constant

zero

maximum

minimum

Answer is:

zero

Structural Engineering I MCQ with Answers

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35) A 2 m long ladder rests against a wall and makes an angle of 30° with the horizontal floor. Where will be the instantaneous center of rotation when the ladder starts slipping ?i) 1.0 in from the wallii)1.732 m from the walliii) 1.0 m above the flooriv) 1.732 m above the floor The correct answer is

(i) and (iii)

(i) and (iv)

(ii) and (iii)

(ii) and (iv)

Answer is:

(ii) and (iv)

36) For a given velocity of a projectile, the range is maximum when the angle of projection is

30°

45°

90°

0°

Answer is:

45°

Explanation:

Angle of projection: Angle of projection is the angle, with the horizontal,at which the projectile is projected.

For a given velocity of a projectile, the range is maximum when the angle of projection is 45°.

For a given velocity of a projectile, the range is maximum when the angle of projection is

37) The angle of projection at which the horizontal range and maximum height of a projectile are equal to

36°

45°

56°

76°

Answer is:

76°

Explanation:

Angle of projection: Angle of projection is the angle, with the horizontal,at which the projectile is projected.

The angle of projection at which the horizontal range and maximum height of a projectile are equal to 76°.