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GATE 2019: Machine Design Rapid Quiz-1 (App update required to attempt this test)

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Question 1

A gear is powered by a motor having 20 kW and torque of 120 Nm. The tangential force acting on the gear is 450 N and the number of teeth on the gears is 26. Find the module ( in mm) of the gears _______.

Question 2

Pre-tensioning of a bolted joint is used to

Question 3

Find the equivalent load of the bearing assuming rotation of its inner ring. 5kN and 2kN are the radial load and axial load respectively and the journal rotates at 1500 rpm. Take
X = 0.56, Y =1.6 and e = 0.34

Question 4

A cone clutch is used in synchronizers to transmit the required torque. The outer radius 30cm and inner radii as 10cm and cone angle is 12˚. The axial load is 70 N and the coefficient of friction is 0.2. During driving at the speed of 400 rpm, what will be the torque transmitted.

Question 5

A machine component made of a ductile material is subjected to a variable loading with

and

. If the corrected endurance limit and the yield strength for the material are

and

, the factor of safety is _______

Question 6

For an Oldham coupling used between two shafts, which among the following statements are correct?
I. Torsional load is transferred along shaft axis.
II. A velocity ratio of 1:2 between shafts is obtained without using gears
III. Bending load is transferred transverse to shaft axis.
IV. Rotation is transferred along shaft axis.

Question 7

A hydrodynamic journal bearing is subject to 2000 N load at a rotational speed of 2000 rpm. Both bearing bore diameter and length are 40 mm. If radial clearance is $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE-ME-2014-Set-1_files\image128.png$ and bearing is lubricated with an oil having viscosity 0.03 Pa.s, the Sommerfeld number of the bearing is ______

Question 8

A steel bar of 10 × 50 mm is cantilevered with two M 12 bolts (P and Q) to support a static load of 4 kN as shown in the figure.

The primary and secondary shear loads on bolt P, respectively, are

Question 9

A block brake is shown in the figure, is subjected to braking torsional moment of 500 Nm. What is the position of pivot i.e. the value of a (in mm) for self-locking condition in clockwise direction to occur?
Take coefficient of friction = 0.3

Question 10

Two members are connected with initial axial tightening force of 3 kN. The external force acting on the assembly is 10 kN. The bolt is made of plain carbon steel (σyt = 400 MPa) and factor of safety is 3. The effective stiffness of the parts held together by the bolt is 3 times the stiffness of the bolt. The diameter(in mm) of the bolt is:

$Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image047.jpg$

Question 11

For shaft the allowable shear stress and the maximum allowable twist are 55 MN/m² and 0.3 deg/m. Diameter of shaft, below which the angle of twist, and not the maximum stress is the controlling factor in design of solid shaft in torsion is _________ mm. [Take, C_p = 80 GN/m²]

Question 12

A bolt of major diameter 12 mm is required to clamp two steel plates. Cross sectional area of the threaded portion of the bolt is 84.3mm². The length of the threaded portion in grip is 30 mm, while the length of the unthreaded portion in grip is 8 mm. Young's modulus of material is 200 GPa. The effective stiffness (in MN/m) of the bolt in the clamped zone is ______

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ESE & GATE ME Machine Design

Sep 16ESE & GATE ME