Question Set 180

41. 

In a hydrodynamic lubricated bearing

A.

there is a thick film of lubricant between the journal and the bearing

B.

there is a thin film of lubricant between the journal and the bearing

C.

there is no lubricant between the journal and the bearing

D.

the lubricant is forced between the journal and the bearing, by external pressure

Answer: Option A

 

42. 

Which of the following statement is correct for gears?

A.

The addendum is less than dedendum

B.

The pitch circle diameter is equal to the product of module and number of teeth

C.

The pitch circle is always greater than the base circle

D.

all of the above

Answer: Option D

 

43. 

A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

A.

less than 20 d

B.

greater than 30 d

C.

between 20 d and 30 d

D.

equal to inside diameter of pipe

Answer: Option C

 

44. 

Stress concentration is caused due to

A.

variations in load acting on a member

B.

variations in properties of materials in a member

C.

abrupt change of cross-section

D.

all of these

Answer: Option C

 

45. 

The resistance to fatigue of a material is measured by

A.

elastic limit

B.

Young's modulus

C.

ultimate tensile strength

D.

endurance limit

Answer: Option D

 

46. 

The load cup of a screw jack is made separate from the head of the spindle to

A.

enhance the load carrying capacity of the jack

B.

reduce the effort needed for lifting the working load

C.

prevent the rotation of load being lifted

D.

reduce the value of frictional torque

Answer: Option C

 

47. 

Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that

A.

shaft B is better than shaft A

B.

shaft A is better than shaft B

C.

both the shafts are equally good

Answer: Option A

 

48. 

The centre distance between two meshing involute gears is equal to

A.

B.

C.

D.

Answer: Option A

 

49. 

Which of the following statement is wrong ?

A.

The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts

B.

The V-belt drive is used with large centre distance

C.

The V-belt may be operated in either direction with tight side of the belt at the top or bottom

D.

The ratio of driving tensions in V-belt drive is more than flat belt drives

Answer: Option B

 

50. 

In a flange coupling, the thickness of flanges is taken as one-half the diameter of shaft.

A.

Agree

B.

Disagree

Answer: Option A