Engineering Mechanics Practice Questions (Mechanical) Set 1

After compression, the time taken by the bodies to regain original shape is known as


Options are :

  • Time of collision
  • Time of compression
  • None of these
  • Time of restitution

Answer : Time of restitution

Heat Transfer Practice Questions (Mechanical Engineering) Set 1

In a simple gear train, the motion of driven gear will ……………….if the number of idle gear is odd


Options are :

  • Be opposite as that of driving gear
  • Depend upon the number of teeth on the driving gear
  • Be same as that of driving gear
  • None of these

Answer : Be same as that of driving gear

What is the acceleration of the lift, when the tension in the cable supporting a lift moving upwards is twice the tension when the lift moves downwards?


Options are :

  • g/4
  • g/3
  • g/2
  • g

Answer : g/3

In cross belt drives the power is transmitted between pulleys rotating in


Options are :

  • Either of these
  • Opposite direction
  • Same direction
  • None of these

Answer : Opposite direction

Engineering Mechanics Practice Questions (Mechanical) Set 1

The co-efficient of friction between two surfaces is the constant of proportionality between the applied tangential force and the normal reaction at


Options are :

  • Any instant after the motion takes place
  • The instant of the application of the force
  • The instant of impending motion
  • Any instant when the body is at rest

Answer : The instant of impending motion

The length of a second pendulum is


Options are :

  • 750 mm
  • 1114 mm
  • 994 mm
  • 550 mm

Answer : 994 mm

The co-efficient of restitution is defined on the basis of which parameters?


Options are :

  • Velocity components along the line of impact only
  • Velocity components normal to the line of impact
  • Velocity vectors before and after the impact
  • All of these

Answer : Velocity components along the line of impact only

In case of motion of two bodies (W1 > W2) connected by a string passing over a smooth pulley, the tension (T) in the string is given by


Options are :

  • 2W1 W2/ W1 + W2
  • W1 W2/ W1 + W2
  • 4W1 W2/ W1 + W2
  • 3W1 W2/ W1 + W2

Answer : 2W1 W2/ W1 + W2

Number of teeth on a wheel per unit of its pitch diameter is called


Options are :

  • None of these
  • Diametral pitch
  • Module
  • Circular pitch

Answer : Diametral pitch

When the distance between the shaft centres is …………………belts and ropes are used


Options are :

  • Large
  • Very small
  • Small
  • None of these

Answer : Large

Equation of a trajectory is written as


Options are :

  • y = x tan a + gx^(2)/2u^(2)cos^(2)?
  • y = x2 tan ? - gx^(2)/2u^(2)cos^(2)?
  • y = x cos ? gx^(2)/2u^(2)cos^(2)?
  • y = x tan a - gx^(2)/2u^(2)cos^(2)?

Answer : y = x tan a - gx^(2)/2u^(2)cos^(2)?

Time of flight of a projectile is given by


Options are :

  • u^2 sin?/g
  • u sin?/g
  • 2u sin^(2)?/g
  • 2u sin?/g

Answer : u sin?/g

In a combined motion of translation and rotation


Options are :

  • None of these
  • The motion of translation takes place before the motion of rotation
  • The motion of rotation takes place before the motion of translation
  • Both the motions take place simultaneously

Answer : Both the motions take place simultaneously

The angle of repose (?) holds the following relation with the angle of friction (?) in the condition of limiting equilibrium


Options are :

  • ?= ?/2
  • ?=2 ?
  • ?= ?
  • ?= ?^2

Answer : ?= ?

In a screw jack the effort (P) required to lift the load (W) is given by the relation


Options are :

  • P=W tan (?2+ ?)
  • P=W tan (?+ ?)
  • P=W tan (?- ?)
  • P=W tan (? 2- ?)

Answer : P=W tan (?+ ?)

The condition for maximum efficiency in case of a screw is given by


Options are :

  • ? = 45° - (?/2)
  • ? = 45° + (?/2)
  • ? = 60° - (?/2)
  • ? = 60° + (?/2)

Answer : ? = 45° - (?/2)

‘The algebraic sum of the moments of two forces about any point in their plane is equal to the moment of their resultant about that point’.

The above statement is called


Options are :

  • Varignon’s theorem
  • Principles of moments
  • Theorem of perpendicular axes
  • Theorem of parallel axes

Answer : Varignon’s theorem

The resultant of two forces P and Q acting at an angle is


Options are :

  • ?P2 + Q2 + 2PQcos?
  • ?P2 + Q2 - PQcos?
  • ?P2 + Q2 + PQcos?
  • ?P2 - Q2 + PQcos?

Answer : ?P2 + Q2 + 2PQcos?

Range of a projectile is given by


Options are :

  • u^2 sin^(2)(?)/g
  • u^2 sin (2?)/g
  • u^3 sin (?)/g
  • u sin^(2) (?)/2g

Answer : u^2 sin (2?)/g

A free body diagram of a body shows a body


Options are :

  • With its surroundings and external forces acting on it
  • Isolated from its surroundings and all external actions on it
  • Isolated from all external actions
  • None of these

Answer : Isolated from its surroundings and all external actions on it

Number of teeth on a wheel per unit of its pitch diameter is called


Options are :

  • Module
  • Circular pitch
  • None of these
  • Diametral pitch

Answer : Diametral pitch

In a simple gear train, the motion of driven gear will ……………….if the number of idle gear is odd


Options are :

  • Be opposite as that of driving gear
  • None of these
  • Be same as that of driving gear
  • Depend upon the number of teeth on the driving gear

Answer : Be same as that of driving gear

The length of a second pendulum is


Options are :

  • 994 mm
  • 1114 mm
  • 550 mm
  • 750 mm

Answer : 994 mm

In cross belt drives the power is transmitted between pulleys rotating in


Options are :

  • Same direction
  • Either of these
  • None of these
  • Opposite direction

Answer : Opposite direction

The co-efficient of restitution is defined on the basis of which parameters?


Options are :

  • Velocity components along the line of impact only
  • All of these
  • Velocity vectors before and after the impact
  • Velocity components normal to the line of impact

Answer : Velocity components along the line of impact only

After compression, the time taken by the bodies to regain original shape is known as


Options are :

  • Time of collision
  • Time of restitution
  • None of these
  • Time of compression

Answer : Time of restitution

What is the acceleration of the lift, when the tension in the cable supporting a lift moving upwards is twice the tension when the lift moves downwards?


Options are :

  • g
  • g/3
  • g/2
  • g/4

Answer : g/3

In case of motion of two bodies (W1 > W2) connected by a string passing over a smooth pulley, the tension (T) in the string is given by


Options are :

  • 2W1 W2/ W1 + W2
  • W1 W2/ W1 + W2
  • 4W1 W2/ W1 + W2
  • 3W1 W2/ W1 + W2

Answer : 2W1 W2/ W1 + W2

When the distance between the shaft centres is …………………belts and ropes are used


Options are :

  • Small
  • None of these
  • Very small
  • Large

Answer : Large

The co-efficient of friction between two surfaces is the constant of proportionality between the applied tangential force and the normal reaction at


Options are :

  • Any instant when the body is at rest
  • The instant of impending motion
  • The instant of the application of the force
  • Any instant after the motion takes place

Answer : The instant of impending motion

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