**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 :

- ? = 45ฐ - (?/2)
- ? = 45ฐ + (?/2)
- ? = 60ฐ - (?/2)
- ? = 60ฐ + (?/2)

**Answer : **? = 45ฐ - (?/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