600 Important Machine Design MCQ Question and Answer | PDF Free Download
1.When the shaft rotates in anticlockwise direction at high speed in a bearing, it will
- AHave contact at the bottom most of the bearing
- BMove towards right of the bearing making metal to metal contact
- CMove towards right of the bearing making no metal to metal contact
- DMove towards left of the bearing making metal to metal contact
2.When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will
- AWhen the shaft rotates in anticlockwise direction at slow speed in a bearing, it will
- BMove towards right of the bearing making no metal to metal contact
- CMove towards right of the bearing making the metal to metal contact
- DMove towards left of the bearing making metal to metal contact
3.When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.
- A10 times
- B5 times
- C15 times
- D20 times
4.A V-belt designated as B 4430 LP has
- A4430 mm as diameter of small pulley
- B4430 mm as nominal pitch length
- C4430 mm as diameter of large pulley
- D4430 mm as centre distance between pulleys
5.The face angle of a bevel gear is equal to
- APitch angle - addendum angle
- BPitch angle + addendum angle
- CPitch angle - dedendum angle
- DPitch angle + dedendum angle
6.The root angle of a bevel gear is equal to
- APitch angle - addendum angle
- BPitch angle + addendum angle
- CPitch angle - dedendum angle
- DPitch angle + dedendum angle
7.The property of a material which enables it to be drawn into wires with the application of a tensile force, is called
- APlasticity
- BElasticity
- CDuctility
- DMalleability
8.When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be
- AKnuckle threads
- BSquare threads
- CAcme threads
- DButtress threads
9.In a horizontal flat belt drive, it is customary to use
- ABottom side of belt as slack side
- BTop side of belt as slack side
- CIdler pulley
- DNone of the above
10.The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is
- ALarger
- BSmaller
- CEqual
- DLarger/smaller depending on diameter of spring coil
11.The size of a cam depends upon
- ABase circle
- BPitch circle
- CPrime circle
- DPitch curve
12.If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to
- AT₁ - T₂ + Tc
- BT₁ + T₂ + Tc
- C(T₁ - T₂ + Tc)/2
- D(T₁ + T₂ + Tc)/2
13.The objective of 'crowning' of the flat pulleys of belt drive is to
- APrevent the belt from running off the pulley
- BIncrease the power transmission capacity
- CIncrease the belt velocity
- DPrevent the belt joint from damaging the belt surface
14.When a machine member is subjected to torsion, the torsional shear stress set up in the member is
- AZero at both the centroidal axis and outer surface of the member
- BMaximum at both the centroidal axis and outer surface of the member
- CZero at the centroidal axis and maximum at the outer surface of the member
- DMaximum at the centroidal axis and zero at the outer surface of the member
15.The suitable material for belt used in flour mill is
- ALeather
- BRubber
- CCanvas or cotton duck
- DBalata gum
16.The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)
- Ad/8
- Bd/6
- Cd/4
- Dd/2
17.According to Indian standard specifications, 100 H6/g5 means that
- ATolerance grade for the hole is 6 and for the shaft is 5
- BTolerance grade for the shaft is 6 and for the hole is 5
- CTolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
- DTolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
18.The longitudinal joint in boilers is used to get the required
- ALength of boiler
- BDiameter of boiler
- CLength and diameter of boiler
- DEfficiency of boiler
19.The longitudinal joint in boilers is used to get the required
- ALength of boiler
- BDiameter of boiler
- CLength and diameter of boiler
- DEfficiency of boiler