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Grashof's Law

What is the rule which states that for a planar four-bar linkage, the sum of the shortest and longest lengths cannot be greater than the sum of the remaining two link lengths if there is to be a continuous relative rotation between two members?

It undergoes permanent deformation

When a specimen of low carbon steel is loaded past its elastic range, what behavior is expected after the load is removed?

Stress is directly proportional to strain

According to Hooke's Law, which statement best describes the relationship between stress and strain for a material within its proportional limit?

Mild steel

Which of the following engineering materials is most capable of sustaining large plastic deformation before fracture?

Equal tensile and compressive stresses

For an element subjected to pure shear stress, the normal stresses acting on planes oriented at 45 deg to the original shear planes are:

The magnitude of follower motion increases

A flat faced follower operates against a cam whose profile is an eccentric circle. As the eccentricity becomes larger, what happens to the follower displacement?

Kinetic energy attains its maximum value

At the instant a vibrating body passes through its equilibrium position, what occurs to the system's energy?

Damped vibration

Which type of vibration is associated with a gradual reduction in amplitude due to frictional or resistive forces?

Oscillating cylinder engine

Which of the following mechanisms represents an inversion of a single slider crank chain?

Elliptical trammel

Which one of the following mechanisms is an inversion of double slider crank chain?

Geneva Mechanism

Which mechanism produces intermittent rotary motion from continuous rotary motion?

orthotropy

Measure mechanical properties of material are same in a particular direction at each point. This property of the material is known as

Mises Henky

Who postulated the maximum distortion energy theory?

Rolling pair

In a belt drive, the pulley acts as

Biaxial or Plane stress

What is a condition where one surface is comparatively free of stress?

Saint Venant's Theory

The maximum strain theory which apples only in elastic range of stresses are also known as?

both linear and angular accelerations

The center of gravity of the coupler link in a 4-bar mechanism would experience:

Coriolis and radial acceleration

Which of the following sets of acceleration is involved in the motion of the piston inside the cylinder of a uniformly rotating cylinder mechanism?

Three binary joints

In kinematic chain, a quaternary joint is equivalent to?

Along a line rotated 90 degrees from the sliding velocity vector in a direction same as that of the angular velocity of the slotted lever

What is the direction of the Coriolis component of acceleration in a slotted lever crank mechanism?

Cycloidal

A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under listed follower motion types will produce the least jerk to the system?

decrease the pressure angle during descent of the follower

An offset provided in radial cam translating Follower mechanism serves to

at the inner dead center position

In a slider crank mechanism, the maximum acceleration of slider is obtained when the crank is

Shaft revolving in a bearing

The example of lower pair is

Incompletely constrained motion

If some links are connected such that motion between them can take place in more than one direction, it is called

Lower pair

Shaft revolving in a bearing is the following type of pair

Isochronous

If the controlling force line for a spring-controlled governor when produced intersects the y-axis at the origin, then governor is said to be

Nickel

Which of the following is the major alloying element of Invar?

Bad conductor of heat and electricity

Plastics are:

Apatite

What's no. 5 in Mohs Hardness Scale?

Agitator ball mills

Which is also known as tube mills and are commonly used for wet grinding?

Compacted graphitic iron

What is a unique form of cast iron with worm shaped graphite particles?

Everdur

Which of the following is available in five slightly different nominal composition for applications which require high strength, good fabricating and fusing qualities, immunity to rust, free machining and a corrosion resistance equivalent to copper?

Nickel

Which one of the following elements is an austenitic stabilizer?

Chromium

Which one of the following elements is a ferritic stabilizer?

Malleable cast iron

Which one of the following cast irons consists of carbon in rosette form?

have a larger volume for the same quantity of material used

From design point of view, spherical pressure vessels are preferred over cylindrical pressure vessels because they

The inner radius

In a thick cylinder pressurized from inside, the hoop-stress is maximum at?

slenderness ratio and modulus of elasticity

The buckling load for a given material depends on

Parabolic

The shape of cantilever for uniformly distributed load will be:

Prestressing thick cylinders

Autofrettage is a method of

50% higher

In a beam of rectangular cross section, the maximum shear stress when related to the average shear stress is?

33% higher

In a beam of circular cross section, the maximum shear stress when related to the average shear is?

AISI O1

A low alloy tool steel which is hardened in oil and exhibits only a low tendency to shrinking or warping

Inconel

This alloy has a low creep rate, is age-hardenable and non-magnetic, resists oxidation and exhibits a high strength at elevated temperatures.

Whisker

Which of the following is a single crystal grown by vapor deposition?

Rockwell

Which of the following hardness tests uses the principle of measurement of depth of indentation for obtaining the hardness values of the material being tested?

resilience

The capacity of a material to absorb energy when deformed elastically and then to have this energy recovered upon unloading is called

Aerospace

Kevlar epoxy composite is widely used in

18% chromium, 8% nickel

18/8 stainless steel contains

hardenability

Addition of vanadium to steel results in improvement of

lesser than or equal to 1

Mobility of a statically indeterminate structure is

Soderberg relation

The design calculations for members subject to fluctuating loads with the same factor of safety yield the most conservative estimates when using

End Conditions

In column stability analysis, which factor has the most significant influence on the shape assumed by a column when it buckles under compressive loading?

dangerous section of the beam

The section of a beam that is most critical for design purposes and lies near the location where the bending moment attains its greatest value is referred to as the:

In ductile material local yielding may distribute stress concentration

Stress concentration in a machine component of ductile materials not so harmful as it is in brittle material because

hand pump

In a single slider four In a single slider four-bar linkage when the slider is fixed. It form a mechanism of

all turning pairs

A four-bar chain has

Rotary motion to oscillatory motion

Which one of the following conversions is used by a lawn sprinkler which is a four-bar mechanism

Clearance fit

A shaft and hole are intended to have a guaranteed running clearance under all manufacturing conditions. What fit should the designer specify?

Modulus of elasticity

Which of the following can be calculated indirectly using the properties of Density and velocity of sound in the material?

Increase at the same rate as the area of the metal increases

A thin homogeneous metallic plate containing a hole is heated sufficiently to cause expansion. If the coefficient of surface expansion is linear, the area of the hole will:

tight in shaft and loose in hub

A feather key is usually

saddle key

A key that transmits power through frictional resistance only is

Woodruff key

Which sunk key made the form of a segment of a circular disc of uniform thickness, known as?

Feather key

Which key is commonly used on machine tool spindles because it permits axial movement of the hub without interrupting power transmission?

Flat saddle key

Which key relies primarily on friction rather than shear to transmit torque?

Saddle key

Which key is generally NOT recommended for transmitting heavy torque because no keyway is cut into the shaft?

Gib head key

Which connection is generally preferred when ease of manufacturing is the primary consideration for a rigid shaft-hub connection?

Bending moment and axial load

An axle is a machine part that is subjected to

Key

In designing a shaft, hub and key for a system, weakest member taken is

Tangential key

What is the other name for Kennedy key?

shear and crushing

Holding power of a sunk key is due to resistance, which it offers in

Flexible coupling

A coupling used for absorbing some shock and vibration that may appear on one shaft and of preventing the occurrence of reversed stresses caused by the shaft deflecting at the coupling preventing at the coupling

The key is cut in both shaft and hub

Which of the following will best describe sunk key?

Interference of metal

When the hole is smaller than the shaft, it will take pressure to put the parts together. The allowance is said to be negative and is termed.

Oldham coupling

Which coupling is most suitable for transmitting power between two perfectly aligned shafts while requiring easy dismantling for maintenance?

Pin bush coupling

Which of the following couplings can accommodate both angular and axial shaft displacement through the deformation of rubber bushes?

Universal coupling

Which coupling should be selected when two intersecting shafts must transmit rotary motion while the angle between them varies during operation?

Split-muff coupling

Which of the following couplings is specifically intended to permit axial assembly without requiring either shaft to move longitudinally?

Muff coupling

Which coupling is commonly selected when the shafts are collinear, permanently aligned, and ease of manufacturing is more important than ease of dismantling?

Keyseat

Axially located rectangular groove in a hub and shaft, known as

0.01 in./ft

For machinery shafts, the permissible deflection is approximately:

Zero

For shafts, the shear due to bending is a maximum at the neutral plane where the normal stress is:

Surface decarburisation

Which of the following is not correct procedure to increase the fatigue limit?

Woodruff key

A key capable of tilting in a recess milled out in a shaft is known as

Flat saddle key

A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Gib head key

Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

Proof Resilience

The maximum strain energy that can be stored in a body is known as

Square

Which of the following steel key is usually strong in failure by shear and crushing?

Brittle materials

Stress concentration in cyclic loading is more serious in

Introducing larger fillet radii

Which design modification is generally adopted to reduce the stress concentration factor in mechanical components?

Repeated application of cyclic stresses below the ultimate strength

What type of loading is associated with the fatigue limit of a machine component?

It increases the stress

What is the primary effect of stress concentration in a machine member?

1/root of 2 of the original diameter

While transmitting the same power by a shaft, if its speed is doubled, what should be its new diameter if the maximum shear stress induced in the shaft remains the same?

More than that of the solid shaft

Two shafts, one of solid section and the other of hollow section, of same material and weight having same length are subjected to equal torsional force. What is the torsional stiffness of hollow shaft?

Dunkerley and energy method

The accurate method of finding the natural frequency of transverse vibrations of a system of several loads attached to some shaft is

Conservation of energy

Rayleigh's method of computing the fundamental natural frequency is based on

Non homogeneity of shaft material

Which one of the following causes whirling of shafts?

Oldham coupling

Which type of coupling is most appropriate for connecting two shafts having a small amount of parallel and angular misalignment while transmitting moderate torque?