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Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1


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20 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series | Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 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 - 1 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 - 1 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 - 1 below.
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Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 1

In vibration isolation system, if ω/ωn, then the phase difference between the transmitted force and the disturbing force is

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

In Vibration-isolation system, If the phase difference between transmitted force and the disturbing force is 180°C, then ω/ωn = 1.

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

One tooth of a gear having 4 module and 32 teeth is shown in the figure. Assume that the gear tooth and the corresponding tooth space make equal intercepts on the pitch circumference. The dimensions 'a' and 'b', respectively, are closest to

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 3

Which one of the following causes the whirling of shafts?

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 4

In spur gears, the circle on which the involute is generated is called the

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 5

Rotating shafts tend of vibrate violently at whirling speeds because  

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 6

Tooth interference in an external in volute spur gear pair can be reduced by

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 6


There are several ways to avoid interfering:
i. Increase number of gear teeth
ii. Modified involutes
iii. Modified addendum
iv. Increased centre distance

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 7

Critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 8

The minimum number of teeth on the pinion to operate without interference in standard full height involute teeth gear mechanism with 20° pressure angle is

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 9

The critical speed of a rotating shaft depends upon

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 9

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 10

Interference in a pair of gears is avoided, if the addendum circles of both the gears intersect common tangent to the base circles within the points of tangency.

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 11

A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 12

A spur gear has a module of 3 mm, number of teeth 16, a face width of 36 mm and a pressure angle of 20°. It is transmitting a power of 3 kW at 20 rev/s. Taking a velocity factor of 1.5, and a form factor of 0.3, the stress in the gear tooth is about

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 13

A shaft carries a weight W at the centre. The CG of the weight is displaced by an amount e from the axis of the rotation. If y is the additional displacement of the CG from the axis of rotation due to the centrifugal force, then the ratio of y to e (where ωc, is the critical speed of shaft and w is the angular speed of shaft) is given by  

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 14

Twenty degree full depth involute profiled 19-tooth pinion and 37-tooth gear are in mesh. If the module is 5 mm, the centre distance between the gear pair will be  

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 14

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 15

The critical speed of a shaft is affected by the

Detailed Solution for Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 15

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 16

A 20o full depth involute spur pinion of 4 mm module and 21 teeth is to transmit 15 kW at 960 rpm. Its face width is 25 mm.

Q. The tangential force transmitted (in N) is

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 17

A 20o full depth involute spur pinion of 4 mm module and 21 teeth is to transmit 15 kW at 960 rpm. Its face width is 25 mm.

Q. 

Given that the tooth geometry factor is 0.32 and the combined effect of dynamic load and allied factors intensifying the stress is 1.5; the minimum allowable stress (in MPa) for the gear material is

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 18

 Number of teeth on a wheel per unit of its pitch diameter is called

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 19

A gear set has a pinion with 20 teeth and a gear with 40 teeth. The pinion runs at 30 rev/s and transmits a power of 20 kW. The teeth are on the 20c full-depth system and have a module of 5 mm. The length of the line of action is 19 mm.

Q. The center distance for the above gear set in mm is​

Test: Critical Speeds or Whirling of Shaft & Gear Train & Gear Design - 1 - Question 20

A gear set has a opinion with 20 teeth and a gear with 40 teeth. The pinion runs at 0 rev/s and transmits a power of 20 kW. The teeth are on the 20° full –depth system and have module of 5 mm. The length of the line of action is 19 mm.

Q.

The contact ratio of the contacting tooth

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