Q.1.
In full depth 
involute system, the smallest number of teeth in a pinion which meshes with rack without interference is
-
12 -
16 -
25 -
32
Q.2.
The equation of motion for a single degree of freedom system with viscous damping is 
. The damping ratio of the system is
-
9/8 -
9/82 -
9/16 -
9/128
Q.3.
The unbalanced primary forces in a reciprocating engine are
- Balanced by secondary forces
- Balanced completely
- Balanced partially
- Not balanced
Q.4.
The partial balancing of reciprocating parts in locomotives produces
- hammer blow
- swaying couple
- variation in tractive force along the line of stroke
- all of the above
Q.5.
Crowning on pulleys helps
- In increasing velocity ratio
- In decreasing the slip of the belt
- For automatic adjustment of belt position so that belt runs centrally
- Increase belt and pulley life
Q.6.
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is
- 9/8
- 9/82
- 9/16
- 9/128
Q.7.
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
- Transverse vibrations
- Torsional vibrations
- Longitudinal vibrations
- All of these
Q.8.
Which of the following is an example of sliding pair?
- Piston and cylinder of a reciprocating steam engine
- Shaft with collars at both ends fitted into a circular hole
- Lead screw of a lathe with nut
- Ball and a socket joint
Q.9.
The example of lower pair is
- Shaft revolving in a bearing
- Straight line motion mechanisms
- Automobile steering gear
- All of the above
Q.10.
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)
- n = 3(l - 1) - 2j - h
- n = 2(l - 1) - 2j - h
- n = 3(l - 1) - 3j - h
- n = 2(l - 1) - 3j - h
Q.11.
The maximum fluctuation of energy is the
- Difference between the maximum and minimum energies
- Sum of the maximum and minimum energies
- Variations of energy above and below the mean resisting torque line
- Ratio of the mean resisting torque to the work-done per cycle
Q.12.
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)
- m₁ r₂ = m₂ r₁
- m₁ r₁ = m₂ r₂
- m₁ m₂ = r₁ r₂
- None of these
Q.13.
A chain comprises of 5 links having 5 joints. Is it kinematic chain?
- Yes
- No
- It is a marginal case
- Data are insufficient to determine it
Q.14.
Efficiency of a screw jack is given by
- tan (α + φ)/tanα
- tanα/tan (α +φ)
- tan (α - φ)/tanα
- tanα/tan (α - φ)
Q.15.
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
- a is +ve and b = 0
- a = 0 and b is +ve
- a is +ve and b is -ve
- a is +ve and b is also +ve
Q.16.
The direction of Coriolis component of acceleration is the direction
- Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
- Along the centripetal acceleration
- Along tangential acceleration
- Along perpendicular to angular velocity
Q.17.
In a kinematic chain, a quaternary joint is equivalent to
- One binary joint
- Two binary joints
- Three binary joints
- Four binary joints
Q.18.
Which of the following is an open pair?
- Ball and socket joint
- Journal bearing
- Lead screw and nut
- Cam and follower
Q.19.
The motion of a shaft in a circular hole is an example of
- Completely constrained motion
- Incompletely constrained motion
- Successfully constrained motion
- None of these
Q.20.
A universal joint is an example of
- Higher pair
- Lower pair
- Rolling pair
- Sliding pair
Q.21.
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is
- 1.4 N-s/m
- 18.52 N-s/m
- 52.92 N-s/m
- 529.2 N-s/m
Q.22.
The gear train usually employed in clocks is a
- simple gear train
- reverted gear train
- sun and planet gear
- differential gear
Q.23.
In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines,
- the algebraic sum of the primary forces must be equal to zero
- the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
- both (a) and (b)
- none of these
Q.24.
The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft.
- Right
- Wrong
Q.25.
A circular bar moving in a round hole is an example of
- Incompletely constrained motion
- Partially constrained motion
- Completely constrained motion
- Successfully constrained motion
Q.26.
The D-slide valve is also known as
- Inside admission valve
- Outside admission valve
- Piston slide valve
- None of these
Q.27.
Which of the following is a lower pair?
- Ball and socket i
- Piston and cylinder
- Cam and follower
- Both (A) and (B) above
Q.28.
Critical damping is a function of
- Mass and stiffness
- Mass and damping coefficient
- Mass and natural frequency
- Damping coefficient and natural frequency
Q.29.
The Coriolis component of acceleration is taken into account for
- Slider crank mechanism
- Four bar chain mechanism
- Quick return motion mechanism
- All of these
Q.30.
An automobile steering gear is an example of
- sliding pair
- rolling pair
- lower pair
- higher pair
Q.31.
In order to balance the reciprocating masses,
- primary forces and couples must be balanced
- secondary forces and couples must be balanced
- both (a) and (b)
- none of these
Q.32.
In a screw jack, the effort required to lower the load W is given by
- P = W tan(α - φ)
- P = W tan(α + φ)
- P = W tan(φ - α)
- P = W cos(α + φ)
Q.33.
A pair of friction discs is an example of rolling pair.
- True
- False
Q.34.
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the
- pitch circle
- base circle
- pitch curve
- prime circle
Q.35.
If the pressure angle is __________, a reciprocating follower will jam in its bearings.
- Small
- Too small
- Large
- Too large
Q.36.
Governor is used in automobile to
- Decrease the variation of speed
- Maximize the fuel economy
- Limit the vehicle speed
- Maintain constant engine speed
Q.37.
In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
- Less sensitive
- More sensitive
- Unaffected of sensitivity
- Isochronous
Q.38.
The axis of precession is __________ to the plane in which the axis of spin is going to rotate.
- Parallel
- Perpendicular
- Both A and B
- None of these
Q.39.
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to
- 90° and 180°
- 45° and 225°
- 180° and 270°
- 270° and 360°
Q.40.
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration ofrad/s. When the shaft is rotated atr.p.m., it will whirl with a radius of
- 2 mm
- 2.22 mm
- 2.50 mm
- 3.0 mm
Q.41.
The static friction
- bears a constant ratio to the normal reaction between the two surfaces
- is independent of the area of contact, between the two surfaces
- always acts in a direction, opposite to that in which the body tends to move
- all of the above
Q.42.
When a particle moves round the circumference of a circle of radius r with ω rad/s, then its maximum acceleration is ω2r.
- Right
- Wrong
Q.43.
The sliding pairs, turning pairs and screw pairs form lower pairs.
- True
- False
Q.44.
Davis steering gear consists of
- Sliding pairs
- Turning pairs
- Rolling pairs
- Higher pairs
Q.45.
Ackermann steering gear consists of
- Sliding pairs
- Turning pairs
- Rolling pairs
- Higher pairs
Q.46.
Which of the following mechanism is obtained from lower pair?
- Gyroscope
- Pantograph
- Valve and valve gears
- All of the above
Q.47.
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
- Magnitude of the forces on journal
- Angular velocity of journal
- Clearance between journal and bearing
- Radius of journal
Q.48.
A foot step bearing and rotor of a vertical turbine form examples of
- Incompletely constrained motion
- Partially constrained motion
- Completely constrained motion
- Successfully constrained motion
Q.49.
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.
- Agree
- Disagree
Q.50.
Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.
- Right
- Wrong