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Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2


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30 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series | Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 for Mechanical Engineering 2023 is part of GATE Mechanical (ME) 2023 Mock Test Series preparation. The Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 MCQs are made for Mechanical Engineering 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 below.
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Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 1

The critical speed of a uniform shaft with a rotor at the centre of the span can be reduced by

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 1

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 2

A compacting machine shown in the figure below is used to create a desired thrust force by using a rack and pinion arrangement. The input gear is mounted on tile motor shaft. The gears have involute teeth of 2 mm module.

Q. 

If the drive efficiency is 80%, then torque required on the input shaft to create 1000 N output thrust is 

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 2



Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 3

A compacting machine shown in the figure below is used to create a desired thrust force by using a rack and pinion arrangement. The input gear is mounted on tile motor shaft. The gears have involute teeth of 2 mm module.

Q. 

If the pressure angle of the rack is 20°, then force acting along the line of action between the rack and the gear teeth is

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 3

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 4

Assertion (A): The critical speed of an elastic shaft calculated by the Rayleigh's method is higher than the actual critical speed.

Reason (R): The higher critical speed is due to higher damping ratio.

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 5

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 = counter-clockwise and cw = clockwise).
The arm 4 attached to the output shaft will rotate at

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 6

The danger of breakage and vibration is maximum?

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 7

Two mating spur gears have 40 and 120 teeth respectively. The pinion rotates at 1200 rpm and transmits a torque of 20 Nm. The torque transmitted by the gear is

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 7



where, NP speed of pinion, NG speed of gear wheel

TG = number of teeth of gear,
TP = number of teeth of pinion

Since power transmitted by both gear will be equal

where, TP = torque transmitted by pinion, TG = torque transmitted by gear wheel

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 8

A shaft of 50 mm diameter and 1 m length carries a disc which has mass eccentricity equal to 190 microns. The displacement of the shaft at a speed which is 90% of critical speed in microns is

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 9

The arm OA of an epicyclic gear train shown in figure revolves counter clockwise about O with an angular velocity of 4 rad/s. Both gears are of same size. The angular velocity of gear C, if the sun gear B is fixed, is

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 9


Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 10

If a spring-mass-dashpot system is subjected to excitation by a constant harmonic force, then at resonance, its amplitude of vibration will be            

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 11

Whirling speed of a shaft coincides with the natural frequency of its

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 12

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

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 12


For 5 Re volutions Of Sun , Arm rotates by 1
∴ for 100 revolutions of Sun, Arm rotates by 100/5 = 20

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 13

Whirling speed of shaft is the speed at which

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 14

Large speed reductions (greater than 20) in one stage of a gear train are possible through

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 15

Consider the following statements

The critical speed of a shaft if affected by the
1. eccentricity of the shaft
2. span of the shaft
3. diameter of the shaft

Of these statements:

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 16

To make a worm drive reversible, it is necessary to increase

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 17

The rotor of a turbine is generally rotated at

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 18

For (ω1 = 60 rpm clockwise (cw) when looked from the left, what is the angular velocity of the carrier and its direction so that Gear 4 rotates in counter clockwise (ccw) direction at twice the angular velocity of Gear 1 when looked from the left?

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 18

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 19

Assertion (A): Every rotating shaft has whirling speeds

Reason (R): Eccentricity of rotors on rotating shafts is unavoidable.

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 19

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 20

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

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 20

speed reduction = 1440/36 = 40

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 21

Consider the following statements:    

When two gears are meshing, the clearance is given by the
1. Difference between dedendum of one gear and addendum of the mating gear.
2. Difference between total and the working depth of a gear tooth.
3. Distance between the bottom land of one gear and the top land of the mating gear.
4. Difference between the radii of the base circle and the dedendum circle.

Which of these statements are correct?

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 22

Assertion (A): When one body drives another by direct contact, their contact points must have equal components of velocity normal to the surfaces at the point of contact.

Reason (R): Two points in the same body must have the same component of velocity relative to the third body, in the direction of the line joining the two points. 

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 23

The working surface above the pitch surface of the gear tooth is termed as

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 24

Match List I with List II and select the correct answer using the codes given below the lists: 



Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 25

Match List I with List II and select the correct answer 



Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 26

Which type of gear is used for shaft axes having an offset?  

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 27

When two shafts are neither parallel nor intersecting, power can be transmitted by using

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 28

Which one of the following pairs is not correctly matched?

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 29

The gears employed for connecting two non-intersecting and non-parallel, i.e., non coplanar shafts are

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 2 - Question 30

Mitre gears

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