Rolling Contact Bearings - Mechanical Engineering (MCQ) questions and answers

1)   The expected rating life of roller bearings rotating at 1000 r.p.m. is 30000 hours and equivalent dynamic load of 4000 N acts on it. What is the basic dynamic capacity of the bearing?

a. 26000.12 N
b. 30000.23 N
c. 37900.22 N
d. 48657.61 N
Answer  Explanation 

ANSWER: 37900.22 N

Explanation:
No explanation is available for this question!
2)   Which of the following bearings carry thrust load in one direction?

a. Spherical roller thrust bearings
b. Taper roller bearings
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Both a. and b.

Explanation:
No explanation is available for this question!
3)   A deep groove ball bearing rotating at 1200 r.p.m. is subjected to radial and an axial force of 2000 N and 1500 N respectively. What will be the basic dynamic capacity of bearing if 20,000 hours is the rating life?
(Consider radial factor = 0.55, Thrust factor = 2 & application factor = 1.5?

a. 69.448 kN
b. 54.498 kN
c. 50.236 kN
d. 12.726 kN
Answer  Explanation 

ANSWER: 69.448 kN

Explanation:
No explanation is available for this question!
4)   A cylindrical roller bearing is subjected to radial force of 4500 N and application factor 1.3. What is the equivalent dynamic load acting on bearing if it has 90% reliability with desired life of 10000 hrs?

a. 3461.53 N
b. 5000 N
c. 5850 N
d. Insufficient data
Answer  Explanation 

ANSWER: 5850 N

Explanation:
No explanation is available for this question!
5)   Which of the following elements is not used as a roller in roller bearings?

a. Cylindrical
b. Taper
c. Spherical
d. None of the above
Answer  Explanation 

ANSWER: None of the above

Explanation:
No explanation is available for this question!
6)   Load acting on bearing in its plane of rotation is called as __________

a. axial load
b. radial load
c. thrust load
d. none of the above
Answer  Explanation 

ANSWER: radial load

Explanation:
No explanation is available for this question!
7)   Which of the following is a Stribeck's equation to determine basic static capacity of ball bearings?
(where d = roller diameter, L = roller length)

a. KdLZ / 5
b. Kd2Z / 5
c. K2dL / 5Z
d. 5 Kd / Z
Answer  Explanation 

ANSWER: Kd2Z / 5

Explanation:
No explanation is available for this question!
8)   What will be the static capacity of single-row deep groove ball bearing having 10 balls of 15 mm?
(Assume K = 62 N/mm2)

a. 25900 kN
b. 124 kN
c. 31.00 kN
d. 27.900 kN
Answer  Explanation 

ANSWER: 27.900 kN

Explanation:
No explanation is available for this question!
9)   A cylindrical roller bearing is subjected to frictional torque of 500 N-mm. What is the approximate power loss if the shaft rotates at 1500 r.p.m?

a. 0.0785 kW
b. 0.0392 kW
c. 0.0526 W
d. 0.0236 W
Answer  Explanation 

ANSWER: 0.0785 kW

Explanation:
No explanation is available for this question!
10)   What is the frictional torque acting on a cylindrical roller bearing of 50 mm diameter which is subjected to radial load of 30 kN and has coefficient of friction 0.0011?

a. 109 kN-mm
b. 900 kN-mm
c. 825 N-mm
d. 1650 N-mm
Answer  Explanation 

ANSWER: 825 N-mm

Explanation:
No explanation is available for this question!

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