The ultimate strength of steel in tension in comparison to shear is in the ratio of

The permissible stress for carbon steel under static loading is generally taken as

The property of a material which enables it to resist fracture due to high impact loads is known as

A hot short metal is

Guest’s theory of failure is applicable for following type of materials

Rankine’s theory of failure is applicable for following type of materials

If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows

Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

Resilience of a material is important, when it is subjected to

In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

.Other method of reducing shock load in the above case can be

If a load W is applied instantaneously on a bar; then the stress induced in bar will

Brittle coating technique is used for

Stress concentration is caused due to

The endurance limit of a material with finished surface in comparison to rough surface is

Plastic flow in ductile materials

The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

The fatigue life of a part can be improved by

Stress concentration in static loading is more serious in

Stress concentration in cyclic loading is more serious in

Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Pick up wrong statement. Fatigue strength can be increased by

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

Coaxing is the procedure of increasing

Which is correct statement ? Stress concentration in static loading is

The notch angle of the Izod impact test specimen is

In Vicker’s hardness testing, the pyramid indentor apex is

Which is correct statement ? Stress concentration in cyclic loading is

In testing a material for endurance strength, it is subjected to

If a material fails below its yield point, failure would be due to

The fatigue limit of a material

Cold working

Yield point in fatigue loading as compared to static loading is

Residual stress in materials

The building up of worn and uridersized parts, subjected to repeated loads by electroplating is

In nitrated parts, the origins of the fatigue cracks will occur at

Which process will increase the fatigue duration of parts ?

Which is correct statement ?

Resistance to fatigue of a material is measured by

In most machine members, the damping capacity of the material should be

The ratio of endurance limit in shear to the endurance limit in flexure is

For steel, the ultimate strength in shear as compared to ultimate strength in tension is

At low temperatures (say 75°C) the notched-bar impact value of steel

A bolt

The crest diameter of a screw thread is same as

If d is the diameter of bolt hole then for a flanged pipe joint to be leak proof, the circumferential pitch of the bolts should be

Maximum principal stress theory is applicable for

The following type of nut is used with alien bolt

A stud

Shear stress theory is applicable for

A tap bolt

For applications involving high stresses in one direction only the following type of thread would be best suited

The included angle in unified of American National threads is

The function of a washer is to

Cap screws are

An alien bolt is

The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

Ball bearing type screws are found in following application

Set screws are

A self locking screw has

The designation M 33 x 2 of a bolt means

Machine screws are

Rivets are generally specified by

The edges of a boiler plate are bevelled to an angle of

Which of the following is a permanent fastening ?

In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

Transverse fillet welded joints are designed for

Jam nut is a locking device in which

The pitch of threads on a Jock nut in comparison to pitch of nut is

Buttress threads are usually found on

In order to obtain bolt of uniform strength

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

A key made from a cylindrical disc having segmental cross-section, is known as

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

Fibrous fracture occurs in

Turn buckle has

Eye bolts are used for

Elastic nut is a locking device in which

If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

If threads on a bolt are left hand, threads on nut will be

Taper usually provided on cotter is

Applications in which stresses are encountered in one direction only uses following type of threads

The draw of cotter need not exceed

A bench vice has following type of threads

The valve rod in a steam engine is connected to an eccentric rod by

Split nut is a locking device in which

Taper on the cotter and slot is provided

The function of cutting oil when threading a pipe is to

Silver-based solder is used for

For tight leakage joints, following type of thread is best suited

In order to permit the thermal expansion/contraction of tubing, it should be

A tube has the following advantage over pipe

The strap end of a connecting rod of steam engine is joined by

A backing ring is used inside the pipe joint when making a

The shear plane in case of bolts should

Castle nut is a locking device in which

When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads

Gear box is used

. The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

. The piston rod of a steam engine is usually connected to the crosshead by means of

. Which of the following pipe joints would be suitable for pipes carrying steam

. Spring index is

. The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

. Form coefficient of spring is

. Spring stiffness is

. When two springs are in series (having stiffness K), the equivalent stiffness will be

. When a close coiled helical spring is compressed, its wire is subjected to

. If a spring is cut down into two springs, the stiffness of cut springs will be

. Belt slip may occur due to

. Aircraft body is usually fabricated by

. If two springs are in parallel then their overall stiffness will be

. In hydrodynamic bearings

. Antifriction bearings are

. If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

. In hydrostatic bearings

. Oil in journal bearing should be applied at the point where load is

. The rated life of a bearing varies

. In oilness bearings

. In V-belt drive, belt touches

. Three different weights fall from a certain height under vacuum. They will take

. In cross or regular lay ropes

. In standard taper roller bearings, the angle of taper of outer raceway is

. In composite or reverse laid ropes

. Whether any core is required in wire ropes

. If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

. Basic shaft is one

. Basic hole is one

. I.S. specifies following total number of grades of tolerances

. For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

. Allen bolts are

. The resultant axial load on a bolt depends on

. The connecting rod bolts are tightened up so that tightening stress

. The connecting rod bolts are tightened up with initial tension greater than the external load so that

. If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

. When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at

. The shock absorbing capacity of a bolt can be increased by