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 :
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 :
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 :
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
