Questions and answers for exam Preparation

MCQs

Total Questions : 2607 | Page 119 of 261 pages

Question 1181.

The endurance or
fatigue limit is defined as the maximum value of the stress which a
polished standard specimen can withstand without failure, for infinite
number of cycles, when subjected to

static load
dynamic load
static as well as dynamic load
completely reversed load

Discuss Question

Answer: Option D. -> completely reversed load

Question 1182.

According to Rankine's theory, the failure occurs at a point in a member

when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in a simple tension test
when the maximum principal stress in a bi-axial stress system reaches the elastic limit of the material in a simple tension test
when the strain energy per unit volume in a bi-axial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test
when the maximum principal strain in a bi-axial stress system reaches the strain at the elastic limit as determined from a simple tension test

Discuss Question

Answer: Option B. -> when the maximum principal stress in a bi-axial stress system reaches the elastic limit of the material in a simple tension test

Question 1183.

The eye bolts are used for

transmission of power
locking devices
lifting and transporting heavy machines
absorbing shocks and vibrations

Discuss Question

Answer: Option C. -> lifting and transporting heavy machines

Question 1184.

The material commonly used for crane hooks is

cast iron
wrought iron
mild steel
aluminium

Discuss Question

Answer: Option B. -> wrought iron

Question 1185.

Which of the following welded joint is designed for shear strength ?

Transverse fillet welded joint
Parallel fillet welded joint
Butt welded joint
all of these

Discuss Question

Answer: Option B. -> Parallel fillet welded joint

Question 1186.

The effect of key ways on a shaft is to reduce its load carrying capacity and to increase its torsional rigidity.

True
False

Discuss Question

Answer: Option B. -> False

Question 1187.

In designing a connecting rod, it is considered like __________ for buckling about X-axis.

both ends hinged
both ends fixed
one end fixed and the other end hinged
one end fixed and the other end free

Discuss Question

Answer: Option A. -> both ends hinged

Question 1188.

The temperature required for full annealing in hyper-eutectoid steel is

`50^circ`C above upper critical temperature
`50^circ`C below upper critical temperature
`50^circ`C above lower critical temperature
`50^circ`C below lower critical temperature

Discuss Question

Answer: Option A. -> `50^circ`C above upper critical temperature

Question 1189.

A hollow saddle key is

a taper key which fits half in the key way of hub and half in the key way of shaft
a taper key which fits in a key way of the hub and is flat on the shaft
a taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft
provided in pairs at right angles and each key is to withstand torsion in one direction only

Discuss Question

Answer: Option C. -> a taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

Question 1190.

A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called