Devices MCQs In Basic Mechanical With Answers Part 4 for all competitive exams, placements, GATE and all university exams.
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1 Which of the following type of gears are used for noiseless operation?
A. spur gears
B. bevel gears
C. worm gears
D. helical gears
Ans. D
2 Which of the following type of gears provide maximum velocity ratio?
A. spur gears
B. bevel gears
C. worm gears
D. helical gears
Ans. C
3 Cycloidal tooth gears are used in
A. automobile gearbox
B. machine tool gearbox
C. spring driven watches and clocks
D. materials handling equipment
Ans. C
4 In metric system, the size of the gear tooth is specified by,
A. circular pitch
B. diametral pitch
C. module
D. pitch circle diameter
Ans. C
5 All dimensions for a standard gear system can be defined in terms of,
A. module and number of teeth
B. pressure angle and number of teeth
C. module
D. circular and diametral pitch
Ans. A
6 The thickness of gear tooth is measured
A. along the pitch circle
B. along the base circle
C. along the addendum circle
D. along the root circle
Ans. A
7 The tooth thickness of an involute gear in terms of module ‘m’ is
A. A.157m
B. A.5m
C. 2m
D. A.5708m
Ans. D
8 The curves that satisfy fundamental law of gearing are,
A. cycloid
B. spiral
C. involute
D. a and c
Ans. D
9 Driven pulley is also called as ___
A. Tail pulley
B. Driving pulley
C. Head pulley
D. All of the above
Ans. A
10 Driving pulley is also called as _______
A. Tail pulley
B. Head pulley
C. Driving pulley
D. All of the above
Ans. B
11 The width of flat belt is __ than its thickness
A. greater
B. less
C. same
D. none of these
Ans. A
12 The pulley on which flat belts are mounted is ____
A. Grooved pulley
B. Crown pulley
C. Flat pulley
D. Compound pulley
Ans. B
13 Flat belts are used when two pulleys are not more than ____ meter apart
A. 10
B. 12
C. 14
D. 8
Ans. D
14 The power transmitted by means of a belt does not depends upon
A. velocity of the belt
B. tension under which the belt is placed on the pulleys
C. arc of contact between the belt & the smaller pulley
D. material of the belt
Ans. D
15 When the speed of belt increases
A. the coefficient of friction between the belt & pulley increases
B. the coefficient of friction between the belt & pulley decreases
C. power transmitted will decrease
D. all of the above
Ans. A
16 Creep in belt is due to
A. material of the belt
B. material of the pulley
C. uneven extension & contraction due to varying tension
D. low coefficent of friction
Ans. C
17 An open belt drive is used when
A. shaft are arranged parallel & rotate in the opposite directions
B. shafts are arranged parallel & rotate in the same directions
C. shafts are arranged at right angles & rotate in one definite direction
D. driven shaft is to be started or stopped whenever desired without interferring with the driving shaft.
Ans. B
18 In a crossed belt drive,the shafts are arranged parallel & rotate in the same directions
A. Right
B. Wrong
C. partially wrong
D. partially right
Ans. B
19 In a belt drive,the velocity ratio is the inverse ratio of the diameters of driving & driven pulleys
A. True
B. False
C. partially true
D. partially false
Ans. A
20 The tensions on the slack side of belt is always ------- the tight side of the belt
A. equal to
B. less than
C. greater than
D. negligible
Ans. B
21 All stresses produced in a belt are
A. compressive stresses
B. tensile stresses
C. both tensile &compressive stresses
D. shear stresses
Ans. B
22 In a multiple V-belt drive if one of the belts break then
A. only the broken belt is replaced
B. the entire set of belts is replaced
C. the broken belt & the belt on either side of it is replaced
D. the broken belt need not to be replaced
Ans. B
23 Crowning on pulley helps
A. in decreasing the slip of the belt
B. in increasing the slip of the belt
C. to keep the belt in centre on a pulley while it is in motion
D. to increase pulley life
Ans. C
24 Idler pulley is used for
A. increasing velocity ratio
B. for applying tension
C. changing the direction of motion of belt
D. incresing the speed
Ans. B
25 The V-belt are particularly suitable for ______ drives
A. short
B. long
C. very long
D. all of the above
Ans. A
26 A drive ______ transmits more power as compared to belt drive is
A. chain
B. rope
C. intermediate
D. compound
Ans. A
27 The size of a gear is usually specified by
A. pressure angle
B. pitch circle diameter
C. circular pitch
D. diametral pitch
Ans. B
28 An imaginary circle which by pure rolling action gives the same motion as the actual gear is called
A. addendum circle
B. dedendum circle
C. pitch circle
D. clearance circle
Ans. C
29 The radial distance of a tooth from the pitch circle to the top of the tooth is called
A. dedendum
B. addendum
C. clearance
D. working depth
Ans. B
30 The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
A. dedendum
B. addendum
C. clearance
D. working depth
Ans. A
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