Explore topic-wise MCQs in Machine Design.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.

1.

A herringbone speed reducer consist of 20 teeth pinion driving a 100 teeth gear. The normal module of gear is 2mm. The face width of each half is 30mm and Lewis factor is 0.4. Calculate the ratio factor Q.

A. 1.2
B. 1.4
C. 1.7
D. 1.4
Answer» D. 1.4
Discussion
2.

A herringbone speed reducer consist of 20 teeth pinion driving a 100 teeth gear. The normal module of gear is 2mm. The face width of each half is 30mm and Lewis factor is 0.4. If permissible bending stress is 500N/mm , then calculate the beam strength.

A. 15000N
B. 12000N
C. 8000N
D. 10000N
Answer» C. 8000N
Discussion
3.

Helix angle of herringbone and double helical gears is relatively higher.

A. True
B. False
Answer» B. False
Discussion
4.

The net axial force acting on bearing is zero in case of double helical gears while none zero in case of herringbone gears.

A. True
B. False
Answer» C.
Discussion
5.

A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the tangential force If surface hardness is 260BHN. Also face width=35mm, module=4mm and helix angle=25 . The velocity of operation is 3.5m/s and service factor 1.5.

A. 1136.5N
B. 3983.7
C. 2012.6N
D. 3226.5N
Answer» C. 2012.6N
Discussion
6.

A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the wear strength If surface hardness is 260BHN. Also face width=35mm, module=4mm and helix angle=25 .

A. 443.5N
B. 1125.6N
C. 7971.9N
D. 1014.2N
Answer» D. 1014.2N
Discussion