MachineDesign_and_MachineShopPractices_Definitions_2 Flashcards
It is the difference between the size of a hole and a shaft required for an assemblage when shaft size is smaller than the hole.
Clearance
Two balls are of same size but one has density more than the other. Both are dropped from the same height. Which ball reaches the earth surface first (neglect air resistance)?
Both simultaneously
The sum of the angle of approach and the angle of recess for gears is called ____________.
The angle of action
If two shafts of same length, out of which one is hollow and other is solid which transmit equal torques and have same value of maximum stress, they also have the same __________.
Angular twist
Size of the cam depends on ____________.
Base circle
Gear train value can be defined as _____________.
Reciprocal of velocity ratio
It basically a movable joint of two links which are in contact. The relative motion between the two links should be completely or successfully constrained to make the required pair.
Kinematic pair
Shearing efficiency of rivet can be expressed as:
Shearing strength per strength of unriveted joint
Is the amount by which the dedendum in a given gear exceeds the addendum of its mating gear
Clearance
Is described s a combination of kinematic pairs joined in such a way that the relative motion between the links is completely constrained.
Kinematic chain
In mechanical mechanism terminology, the angle between the direction of the follower motion and normal to the pitch curve is called ___________.
Pressure angle
The translator motion of piston in slider crank mechanism is converted into rotary motion of crank by
Connecting rod
A universal joint is an example of ___________.
Lower pair
A rock is a gear of _____________.
Infinite diameter
Strain in a direction at a right angle to the direction of applied force is known as ___________.
Lateral strain
Which of the following will be exhibited by a ductile material upon application of force?
Major plastic deformation before crack propagation
Which of the following hardening processes is not employed for steels?
Age hardening
Toughness property of material is related to _____________.
Impact strength
In dealing with tolerances and allowances “fit” means ________________.
Degree of tightness or looseness between two mating parts to perform a definite function.
Outside calipers have _____________.
Legs bent inwards
A localized compressive stress at the area of contact between two members is known as _____.
Bearing stress
Stress concentration factor is the ratio of _____________.
Maximum stress to the nominal stress
Rated life of a ball bearing varies as __________.
Inversely of cube of load
What is the main purpose of lubricants in bearings?
All of the above
Which of the following is the best characteristic of spherical roller bearings?
High operational speeds
What is the effect of centrifugal tension in belts on the power transmitted?
Power transmitted remains unaffected
Creep in a belt tends to _______________.
Reduce the speed of the driven pulley and consequently reduce the power output
Pitch diameter for an external or internal thread is also called __________.
Effective diameter
What is the spring stiffness?
It is the load per unit deflection
Where does shear stress occur in case of a shaft of rectangular section is subjected to a twisting moment?
At the center of the longer side
Which of the following is the usual method of shaft manufacturing
All of the above
The number of bolts required to couple the flanges of a coupling depends upon _________.
Diameter of the shaft
For a square key made of mild steel, the shear and crushing strength are related as _________.
Shear strength is equal to crushing strength
Which of the following statements is correct regarding frictional resistance of journal bearing under film lubrication condition?
Proportional to the speed of rotation
Which of the following conditions should be satisfied in the design when two spur gears are to be in mesh?
Module must be the same
Spur gear tooth design is considered as ___________.
Cantilever loading
The distance from the top of the tooth to the root of a gear; it is equal to addendum plus dedendum or to working depth plus clearance.
Whole depth
Which of the following is not the advantage of a wet friction clutch?
High coefficient of friction
The root angle of a bevel gear is equal to _________.
pitch angle – dedendum angle
Which of the following gears should be recommended for a speed reduction of 50:1?
Worm and worm wheel
In worm gears, pitch lead angle is
The angle between the tangent to the pitch helix and the plane of rotation
In case of manual TIG welding, the angle of the electrode with the direction of welding should be _________.
70 deg
It occurs when the ratio of oxygen to acetylene required for a neutral flame has been changed to give an excess of oxygen.
Oxidizing flame
In case of a thick cylinder, the variation of hoop stress across the thickness is ___________.
Parabolic
Which of the following described a “Surface plates”?
All of the above
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate which in turn acts on the nut. The tension in both after this is __________.
F + P
Cast iron pipes are mainly used for __________.
Water and sewage system
This is a standardized measure of the maximum difference in size between the component and the basic size.
International Tolerance Grade
A full scale technical drawing will have a scale factor of _________.
1:1
