Design of Machine Elements - Set 10

1)   The strap end of a connecting rod of steam engine is joined by_________________?

a. gib of cotter joint
b. sleeve and cotter joint
c. spigot socket cotter joint
d. knuckle joint
e. universal coupling
Answer  Explanation 

ANSWER: gib of cotter joint

Explanation:
No explanation is available for this question!


2)   The shear plane in case of bolts should_________________?

a. be across threaded portion of shank
b. be parallel to axis of bolt
c. be normal to threaded portion of shank
d. never be across the threaded portion
e. none of the above
Answer  Explanation 

ANSWER: never be across the threaded portion

Explanation:
No explanation is available for this question!


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

a. compression
b. tension
c. shear
d. combined loads
e. all of the above
Answer  Explanation 

ANSWER: tension

Explanation:
No explanation is available for this question!


4)   The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for_________________?

a. reducing stress concentration
b. ease of manufacture
c. safety
d. fullering and caulking
e. all of the above
Answer  Explanation 

ANSWER: fullering and caulking

Explanation:
No explanation is available for this question!


5)   Which of the following pipe joints would be suitable for pipes carrying steam_____________?

a. flanged
b. threaded
c. bell and spigot
d. expansion
e. compression
Answer  Explanation 

ANSWER: expansion

Explanation:
No explanation is available for this question!


6)   The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is_________________?

a. larger
b. smaller
c. equal
d. larger/smaller depending on diameter of spring coil
e. unpredictable
Answer  Explanation 

ANSWER: larger

Explanation:
No explanation is available for this question!


7)   Spring stiffness is__________________?

a. ratio of coil diameter to wire diameter
b. load required to produce unit deflection
c. its capability of storing energy
d. its ability to absorb shocks
e. none of the above
Answer  Explanation 

ANSWER: load required to produce unit deflection

Explanation:
No explanation is available for this question!


8)   When a close coiled helical spring is compressed, its wire is subjected to________________?

a. tension
b. shear
c. compression
d. all of the above
e. none of the above
Answer  Explanation 

ANSWER: tension

Explanation:
No explanation is available for this question!


9)   Belt slip may occur due to________________?

a. heavy load
b. loose belt
c. driving pulley too small
d. all of the above
e. none of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


10)   If two springs are in parallel then their overall stiffness will be_______________?

a. half
b. same
c. double
d. unpredictable
e. none of the above
Answer  Explanation 

ANSWER: double

Explanation:
No explanation is available for this question!


11)   Antifriction bearings are__________________?

a. sleeve bearings
b. hydrodynamic bearings
c. thin lubricated bearings
d. ball and roller bearings
e. none of the above
Answer  Explanation 

ANSWER: none of the above

Explanation:
No explanation is available for this question!


12)   The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is___________________?

a. 0.01 micron
b. 0.1 micron
c. 1 micron
d. 10 microns
e. 25 microns
Answer  Explanation 

ANSWER: 1 micron

Explanation:
No explanation is available for this question!


13)   Oil in journal bearing should be applied at the point where load is________________?

a. nil or lightest
b. maximum
c. average
d. any one of the above
e. unpredictable
Answer  Explanation 

ANSWER: nil or lightest

Explanation:
No explanation is available for this question!


14)   In oilness bearings________________?

a. the oil film pressure is generated only by the rotation of the journal
b. the oil film is maintained by supplying oil under pressure
c. do not require external supply of lubricant
d. grease required to be applied after some intervals
e. none of the above
Answer  Explanation 

ANSWER: do not require external supply of lubricant

Explanation:
No explanation is available for this question!


15)   Three different weights fall from a certain height under vacuum. They will take______________?

a. same time to reach earth
b. times proportional to weight to reach earth
c. times inversely proportional to weight to reach earth
d. unpredictable
e. none of the above
Answer  Explanation 

ANSWER: same time to reach earth

Explanation:
No explanation is available for this question!


16)   In standard taper roller bearings, the angle of taper of outer raceway is___________________?

a.
b.
c. 15°
d. 25°
e. 40°
Answer  Explanation 

ANSWER: 25°

Explanation:
No explanation is available for this question!


17)   Whether any core is required in wire ropes________________?

a. yes
b. no
c. sometimes
d. rarely
e. very often
Answer  Explanation 

ANSWER: yes

Explanation:
No explanation is available for this question!


18)   Basic shaft is one__________________?

a. whose upper deviation is zero
b. whose lower deviation is zero
c. whose lower as well as upper deviations are zero
d. does not exist
e. none of the above
Answer  Explanation 

ANSWER: whose upper deviation is zero

Explanation:
No explanation is available for this question!


19)   In composite or reverse laid ropes___________________?

a. direction of twist of wires in strands is opposite to the direction of twist of strands
b. direction of twist of wires and strands are same
c. wires in two adjacent strands are twisted in opposite direction
d. wires are not twisted
e. none of the above
Answer  Explanation 

ANSWER: wires in two adjacent strands are twisted in opposite direction

Explanation:
No explanation is available for this question!


20)   I.S. specifies following total number of grades of tolerances__________________?

a. 18
b. 16
c. 20
d. 22
e. 14
Answer  Explanation 

ANSWER: 18

Explanation:
No explanation is available for this question!