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The motion of a shaft in a circular hole is an example of
successfully constrained motion
NONE OF THESE
incompletely constrained motion
completely constrained motion
The acceleration of a particle at any instant has two components
i.e. radial component and tangentialcomponent.
These two components will be
perpendicular to each other
opposite to each other
inclined at 45°
parallel to each other
In a screw jack, the effort required to lower the load W is given by
P = W cos(α + φ)
P = W tan(φ - α)
P = W tan(α + φ)
P = W tan(α - φ)
If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be
Stable
Unstable
NONE OF THESE
isochronous
In under damped vibrating system, the amplitude of vibration
increases linearly with time
decreases exponentially with time
decreases linearly with time
increases exponentially with time
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
18.52 N-s/m
529.2 N-s/m
1.4 N-s/m
52.92 N-s/m
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
30° - 40°
10° - 15°
25° - 30°
15° - 25°
For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the belowfigure.
The engine is a
30° V-engine
150° V-engine
60° V-engine
120° V-engine
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to
vector difference of radial component and tangential component
vector sum of radial component and tangential component
vector sum of radial component and coriolis component
vector sum of tangential component and coriolis component
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distanceapart.
The two masses form an equivalent dynamical system, if
the centre of gravity of the two masses coincides with that of the body
the sum of the two masses is equal to the total mass of body
All of the above
The Whitworth quick return motion mechanism is formed in a slider crank chain when the
coupler link is fixed
smallest link is a fixed link
slider is a fixed link
longest link is a fixed link
A kinematic chain is known as a mechanism when
none of the links is fixed
one of the links is fixed
NONE OF THESE
two of the links are fixed
When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid isrequired.
The supply of the working fluid to the engine is controlled by a
Governor
D-slide valve
flywheel
Meyer's expansion valve
The centre of gravity of a coupler link in a four bar mechanism will experience
no acceleration
both linear and angular acceleration
only linear acceleration
only angular acceleration
Which of the following is an example of sliding pair
Ball and a socket joint
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
The relation l = (j +
2) apply only to kinematic chains in which lower pairs areused.
This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
one lower pair and two additional links
two lower pairs and one additional link
two lower pairs and two additional links
any one of these
A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is
ωv
2 ωv2
ω2v
2 ωv
When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be
Zero
NONE OF THESE
Minimum
maximum
A mechanism is an assemblage of
four or more than four links
three links
two links
All of These
In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
0.8
0.4
0.6
0.2
1
2
8
15
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