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GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering PDF Download

Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:In the gear train shown gear 3 is carried on arm 5, Gear 3 meshes with gear 2 and gear 4. The number of teeth on gear 2, 3 and 4 are 60, 20, and 100, respectively. If gear 2 is fixed and gear 4 rotates with an angular velocity of 100 rpm in the counterclockwise direction, the angular speed of arm 5 (in rpm) is

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

[2016,Set-1]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:A gear train is made up of five spur gears as shown in the figure. Gear 2 is driver and gear 6 is driven member. N2, N3, N4, N5 and N6 represent number of teeth on gears 2,3,4,5 and 6 respectively. The gear(s) which act(s) as idler(s) is/are

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

[2015,Set-3]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:The number of degree of freedom of the planetary gear train shown in the figure is

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

[2015,Set-2]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:Gear 2 rotates at 1200 rpm is counter clockwise direction and engages with Gear 3 and Gear 4 mounted on the same shaft. Gear 5 engages with Gear 4. The numbers of teeth on Gears 2, 3, 4 and 5 are 20, 40, 15 and 30, respectively. The angular speed of Gear 5 is 

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

[2014,Set-3]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:A compound gear train with gears P, Q, R and S has number of teeth 20,40,15 and 20 respectively.Gears Q and P are mounted on the same shaft as shown in the figure below. The diameter of the gear Q is twice that of the gear R. If the module of the gear R is 2 mm, the centre distance in mm between gears Pand S is

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

[2013]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:For the epicyclic gear arrangement shown in the figure, ω2 = 100 rad/s clockwise (cw) and ωarm = 80 rad/s counter clockwise (ccw). The angular velocity ω5 (in rad/s) is

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

[2010]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:An epicyclic gear train is shown schematically in the adjacent figure. The sun gear 2 on the input shaft is a 20 teeth external gear. The planet gear 3 is a 40 teeth external gear. The ring gear 5 is a 100 teeth internal gear. The ring gear 5 is fixed and the gear 2 is rotating at 60 rpm ccw(ccwcounterclockwise and cw- clockwise).

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

The arm 4 attached to the output shaft will rotate at

[2009]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:The arm OA of a epicyclic gear train shown in figure revolves counter clockwise about Owith an angular velocity of 4 rad/s. Both gear are of same size. The angular velocity of gears C, if the sun gear B is fixed is

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

[1995]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:The sun gear in the figure is driven clockwise at 100 rpm. The ring gear is held stationary. For the number of teeth shown on the gears, the arm rotates at

GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering

[1993]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:A spur gear has pitch circle diameter D and number of teeth T. The circular pitch of the gear is

[2019,Set 2]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:A spur gear with 200 full depth teeth is transmitting 20 kW at 200 rad/s. The pitch circle diameter of the gear is 100 mm. The magnitude of the force applied on the gear in the radial direction is

[2019, Set 1]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:It is desired to avoid interference in a pair of spur gears having a 20° pressure angle. With increase in pinion to gear speed ratio, the minimum number of teeth on the pinion

[2014,Set-4]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:The following are the data for two crossed helical gears used for speed reduction:
Gear I : Pitch circle diameter in the plane of rotation 80 mm and helix angle 30°
Gear II : Pitch circle diameter in the plane of rotation 120 mm and helix angle 22.5°

If the input speed is 1440 rpm, the output speed in rpm is

[2012]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:Tooth interference in an external involute spur gear pair can be reduced by

[2010]

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Question for GATE Past Year Questions: Gears & Gear Trains
Try yourself:A 1.5 kW motor is running at 1440 rev/min. It is to be connected to a stirrer running at 36 rev/min. The gearing arrangement suitable for this application is

[2000]

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The document GATE Past Year Questions: Gears & Gear Trains | Theory of Machines (TOM) - Mechanical Engineering is a part of the Mechanical Engineering Course Theory of Machines (TOM).
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FAQs on GATE Past Year Questions: Gears & Gear Trains - Theory of Machines (TOM) - Mechanical Engineering

1. What are gears and gear trains?
Ans. Gears are mechanical devices with teeth that transmit rotation from one shaft to another. Gear trains, on the other hand, are systems made up of multiple gears that work together to transmit motion and torque. They are commonly used in machines and mechanisms to transfer power and change the speed or direction of rotation.
2. How do gears and gear trains work?
Ans. Gears work by engaging their teeth with the teeth of another gear, causing rotational motion to be transferred from one gear to the other. Gear trains work by combining multiple gears in a specific arrangement, such as series or parallel, to achieve the desired speed or torque output. The size and number of teeth on each gear determine the gear ratio, which determines the relationship between the input and output speeds or torques.
3. What are the different types of gears?
Ans. There are several types of gears, including spur gears, helical gears, bevel gears, worm gears, and rack and pinion gears. Spur gears have straight teeth and are commonly used for parallel shafts. Helical gears have angled teeth and provide smoother and quieter operation. Bevel gears are used to transmit motion between intersecting shafts. Worm gears consist of a worm and a worm wheel and are used for large speed reductions. Rack and pinion gears convert rotational motion into linear motion.
4. What is the significance of gear ratio in gear trains?
Ans. The gear ratio in a gear train determines the relationship between the input and output speeds or torques. It indicates how many times the output shaft rotates compared to the input shaft for each rotation. A gear train with a high gear ratio will provide a higher output torque but lower speed, while a gear train with a low gear ratio will provide a higher speed but lower torque. Gear ratio is crucial in designing gear trains to meet the specific requirements of a mechanical system.
5. What are some applications of gears and gear trains in mechanical engineering?
Ans. Gears and gear trains have a wide range of applications in mechanical engineering. They are commonly used in vehicles, such as cars and bicycles, to transmit power from the engine to the wheels. They are also used in industrial machinery, such as conveyor systems and manufacturing equipment, to transfer motion and control speed. Gears are essential in many mechanical systems, including watches, wind turbines, and robotics, where precise motion control and power transmission are required.
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