HIGH GEAR RATIO A B C D A B C D (A) 5 4 3 1 (B) 2 3 4 5 (C) 5 3 4 1...
5.
High
gear
ratio
A B C D A B
C
D
(a) 5
4
3
1
(b)
2
3
4
5
(c) 5
3
4
1
(d)
2
4
3
5
IES-10Ans. (a)
IES-11. Which type of gear is used for shaft axes having an offset? [IES-2004]
(a) Mitre gears
(b) Spiral bevel gears
(c) Hypoid gears
(d) Zerol gears
IES-11.Ans. (c)
IES-12. The gears employed for connecting two non-intersecting and non-parallel,
i.e., non-coplanar shafts are
[IES-2003; 2005]
(a) Bevel gears (b) Spiral gears
(c) Helical gears
(d) Mitre gears
IES-12.Ans. (b)
IES-13. When two shafts are neither parallel nor intersecting, power can be
transmitted by using
[IES-1998]
(a) A pair of spur gears
(b) a pair of helical gears
(c) An Oldham's coupling
(d) a pair of spiral gears
IES-13Ans. (d)
IES-14. In a single reduction, a large velocity ratio is required. The best
transmission is
[IES-1999]
(a) Spur gear drive
(b) helical gear drive
(c) Bevel gear drive
(d) worm gear drive
IES-14Ans. (a)
IES-15. Which one of the following pairs is not correctly matched? [IES-1995]
(a) Positive drive .... Belt drive
(b) High velocity ratio .... Worm gearing
(c) To connect non-parallel and non- intersecting shafts .... Spiral gearing.
Design of Power Transmission System
S K Mondal’s
Chapter 3
(d) Diminished noise and smooth operation .... Helical gears.
IES-15Ans. (a)
Mitres gearIES-16. Mitre gears
[IES-1992]
(a) spur-gears with gear ratio 1: 1
(b) Skew gears connecting non-parallel and nonintersecting shafts
(c) Bevel gears transmitting power at more than or less than 90°
(d) Bevel gears in which the angle between the axes is 90° and the speed ratio of
the gears is 1: 1
IES-16Ans. (d)
IES-17. Match List-I (Gears) with List-II (Configurations) and select the correct
answer using the codes given below the Lists:
[IES-2003]
List-I
List-II
(Gears)
(Configurations)
A Spur
1. Connecting two non-parallel or intersecting but coplanar
shafts
B. Bevel
2. Connecting two parallel and coplanar shafts with teeth
parallel to the axis of the gear wheel
C. Helical
3. Connecting two parallel and coplanar shafts with teeth
inclined to the axis of the gear wheel
D. Mitre
4. Connecting two shafts whose axes are mutually
perpendicular
to
each
other
Codes:
A
B
C
D
A
B
C
D
(a)
2
4
3
1
(b)
3
1
2
4
(c)
2
1
3
4
(d)
3
4
2
1
IES-17Ans. (c)
Pitch pointIES-18. Gearing contact is which one of the following?
[IES 2007]
(a) Sliding contact
(b) Sliding contact, only rolling at pitch point
(c) Rolling contact
(d) Rolling and sliding at each point of
contact
IES-18Ans. (b)
When pair of teeth touch at the pitch point ,they have for the instant pure rolling
action. At any other position they have the slidingaction.
IES-19. When two spur gears having involute profiles on, their teeth engage, the
line of action is tangential to the
[IES-2003]
(a) Pitch circles
(b) Dedendum circles
(c) Addendum circles
(d) Base circles
IES-19Ans. (d)
Pressure angleIES-20. What is the value of pressure angle generally used for involute gears?
[IES-2006]
(a) 35°
(b) 30°
(c) 25 °
(d) 20°
IES-20Ans. (d)
IES-21. Consider the following, modifications regarding avoiding the interference
between gears:
[IES-2003]