600 Important Machine Design MCQ Question and Answer | PDF Free Download
1.In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called
- ANormal pitch
- BAxial pitch
- CDiametral pitch
- DModule
2.The ratio of pitch circle diameter in millimeters to the number of teeth, is called
- ACircular pitch
- BDiametral pitch
- CModule
- DNone of these
3.A screw is specified by its
- AMajor diameter
- BMinor diameter
- CPitch diameter
- DPitch
4.A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)
- Aσ [1 + (b/2a)]
- Bσ [1 + (2a/b)]
- Cσ [1 + (b/3a)]
- Dσ [1 + (3a/b)]
5.Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say tha
- AShaft B is better than shaft A
- BShaft A is better than shaft B
- CBoth the shafts are equally good
- DNone of these
6.18/8 steel contains
- A18% nickel and 8% chromium
- B18% chromium and 8% nickel
- C18% nickel and 8% vanadium
- D18% vanadium and 8% nickel
7.In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.
- ALarger than
- BSmaller than
- CEqual to
- DEqual to
8.Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.
- ATwice
- BFour times
- CEight times
- DSixteen times
9.A stud
- AHas a head on one end and a nut fitted to the other
- BHas head at one end and other end fits into a tapped hole in the other part to be joined
- CHas both the ends threaded
- DHas pointed threads
10.Which one of the following is a positive drive?
- AV-belt drive
- BRope drive
- CCrossed flat belt drive
- DChain drive
11.A key way lowers
- AThe strength of the shaft
- BThe rigidity of the shaft
- CBoth the strength and rigidity of the shaft
- DThe ductility of the shaft
12.Which of the following cotter joint will be used to connect strap end of a connecting rod?
- ASpigot and socket cotter joint
- BSleeve and cotter joint
- CGib and cotter joint
- DAny one of these
13.Which of the following statement is wrong for a connecting rod?
- AThe connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy
- BIf Ixx > 4 Iyy, the buckling will occur about Y-axis
- CIf Ixx < 4 Iyy, the buckling will occur about X-axis
- DThe most suitable section for the connecting rod is T-section
14.A single strap butt joint is always in __________ shear.
- ASingle
- BDouble
- CTriple share
- DNone of these
15.A crankshaft is a __________ shaft.
- ATransmission
- BMachine
- CMachine frame
- DNone of these
16.The V-belts are particularly suitable for __________ drives
- AShort
- BLong
- CBoth A and B
- DNone of these
17.The expansion joint is mostly used for pipes which carry steam at __________ pressures.
- ALow
- BHigh
- CMedium
- DNone of these
18.A riveted joint is a __________ fastening.
- APermanent
- BTemporary
- CEither A or B
- DNone of these
19.For tight leakage joints, following type of thread is best suited
- AMetric
- BButtress
- CSquare
- DNPT (national pipe threads).
20.The rolling contact bearings as compared to sliding contact bearings have
- ALow starting and low running friction except at very high speeds
- BAccuracy of shaft alignment
- CSmall overall dimensions
- DAll of the above