Engineering Questions with Answers - Multiple Choice Questions

Home » MCQs » Aeronautical Engineering » Machine Kinematics – Kinematics of Motion

# Machine Kinematics – Kinematics of Motion

1 - Question

The unit of linear acceleration is

a) kg-m

b) m/s

c) m/s2

d) rad/s2

**
View Answer**

Answer: cExplanation: Linear acceleration is defined as the rate of change of linear velocity of a body with respect to the time. i.e a = v/t and unit of velocity is m/s so, unit of linear acceleration becomes m/s2.

2 - Question

The angular velocity (in rad/s) of a body rotating at N r.p.m. is

a) π N/60

b) 2 π N/60

c) π N/120

d) π N/180

**
View Answer**

Answer: bExplanation: Angular velocity is defined as the rate of change of angular displacement with respect to time. It is usually expressed by a Greek letter ω (omega). Mathematically, angular velocity, ω =dθ/dt If a body is rotating at the rate of N r.p.m. (revolutions per minute), then its angular velocity, ω = 2πΝ / 60 rad/s

3 - Question

The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by

a) ω.r

b) ω/r

c) ωs2.r

d) ωs2/r

**
View Answer**

Answer: aExplanation: If the displacement is along a circular path, then the direction of linear velocity at any instant is along the tangent at that point. therefore, the linear velocity will be ω.r

4 - Question

When a particle moves along a straight path, then the particle has

a) tangential acceleration only

b) centripetal acceleration only

c) both tangential and centripetal acceleration

d) none of the mentioned

**
View Answer**

Answer: aExplanation: The acceleration of a particle at any instant moving along a circular path in a direction tangential to that instant, is known as tangential component of acceleration or tangential acceleration.

5 - Question

When a particle moves with a uniform velocity along a circular path, then the particle has

a) tangential acceleration only

b) centripetal acceleration only

c) both tangential and centripetal acceleration

d) none of the mentioned

**
View Answer**

Answer: bExplanation: The acceleration of a particle at any instant moving along a circular path in a direction normal to the tangent at that instant and directed towards the centre of the circular path is known as normal component of the acceleration or normal acceleration. It is also called radial or centripetal acceleration.

6 - Question

When the motion of a body is confined to only one plane, the motion is said to be

a) plane motion

b) rectilinear motion

c) curvilinear Motion

d) none of the mentioned

**
View Answer**

Answer: aExplanation: When the motion of a body is confined to only one plane, the motion is said to be plane motion. The plane motion may be either rectilinear or curvilinear.

7 - Question

_______________ is the simplest type of motion and is along a straight line path.

a) plane motion

b) rectilinear motion

c) curvilinear Motion

d) none of the mentioned

**
View Answer**

Answer: bExplanation: Rectilinear Motion is the simplest type of motion and is along a straight line path. Such a motion is also known as translatory motion.

8 - Question

_________________ is the motion along a curved path.

a) plane motion

b) rectilinear motion

c) curvilinear Motion

d) none of the mentioned

**
View Answer**

Answer: cExplanation: Curvilinear Motion is the motion along a curved path. Such a motion, when confined to one plane, is called plane curvilinear motion.

9 - Question

Displacement of a body is a ___________ quantity.

a) scalar

b) vector

c) scalar and vector

d) none of the mentioned

**
View Answer**

Answer: bExplanation: The displacement of a body is a vector quantity, as it has both magnitude and direction. Linear displacement may, therefore, be represented graphically by a straight line.

10 - Question

A train covers 60 miles between 2 p.m. and 4 p.m. How fast was it going at 3 p.m.?

a) 60 mph

b) 30 mph

c) 40 mph

d) 50 mph

**
View Answer**

Answer: bExplanation: The speed is traveled distance (60 miles) divided by traveled time (4pm – 2pm = 2hours): 60 miles/ 2 hours = 30 mph