# Upwork Manufacturing Design Test Answer

|## Upwork Manufacturing Design Test Answer

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*Calculate the radius of curvature of a beam on which a bending stress of 1000 newtons per square meter is applied. The distance from extreme fiber to the neutral axis of the beam is 50 meters and the value of the Young’s modulus for the material of the beam is 2 x 10 ^{5} newtons per square meter.*

- 1000 meters
- 2000 meters
- 3000 meters
- 5000 meters

*The value of the stress concentration factor for static loading for a lap joint or a butt joint is ___________.*

- 1
- 1.2
- 1.5
- 2

*If the strength of the key and the shaft is equal, then the length of the key will be ____________.*

- equal to the diameter of the shaft.
- 1.2 times the diameter of the shaft
- 2 times the diameter of the shaft
- 1.8 times the diameter of the shaft
- half of the diameter of the shaft

*Which type of belt is used for shafts which rotate in opposite direction?*

- open belt drive
- twist belt drive
- quarter turn belt drive
- fast and loose pulley drive

*Which among the following is a heavy duty key?*

- square key
- rectangular key
- woodruff key
- round key

*What is the value of margin of a riveted joint which is kept to prevent the tearing of the riveted plates at the edges?
*

Here d is the diameter of the rivet hole

- 4d
- 2d
- 2.5d
- 1.5d

*The distance between the center of adjacent rivets on adjacent gauge lines is known as ___________.*

- diagonal pitch
- pitch
- marginal distance
- unit length

*Calculate the factor of safety of a key in crushing, given that the yield stress in crushing is 400 newtons per square millimeter and crushing stress induced in the key is 100 newtons per square millimeter.*

- 1
- 2
- 3
- 4
- 5

*A feather key permits __________.*

- turning moment
- axial moment
- both turning and axial moment

*The value of the lateral strain in a steel rod is 100 meters and the value of the linear strain in the same rod is 300 meters. Calculate the Poisson’s ratio.*

- 3
- 4/3
**1/3**- 2/3

*Calculate the diameter of a hole which is to be drilled in a 50 millimeters bolt, given that the core diameter is 40 millimeters.*

- 10 millimeters
- 15 millimeters
- 25 millimeters
- 30 millimeters

*In a helical gear, the helix angle for a single helical gear ranges from __________.*

- 5° to 20°
- 20° to 35°
- 40° to 55°
- 60° to 75°

*The included angle in a British Standard Whitworth thread is ___________.*

- 47.5°
- 60°
- 45°
- 55°

*If the shaft diameter is 20 millimeters, calculate the pitch circle diameter of the bolts for a flange coupling.*

- 60 millimeters
- 80 millimeters
- 120 millimeters
- 140 millimeters

*In which among the following types of gear does the pressure angle remains constant?*

- cycloidal gear
**involute gear**- worm and wheel gear
- herringbone gear

*For a plate thickness ranging between 10 millimeters to 16 millimeters, the minimum weld size will be __________.*

- 14 millimeters
- 20 millimeters
- 6 millimeters
- 10 millimeters

*If the rivet hole diameter is 19.5 millimeters, calculate the nominal diameter of the rivet.*

- 16 millimeters
- 18 millimeters
- 20 millimeters
- 22 millimeters

*Calculate the maximum shear stress in a circular fillet weld made between a circular rod of 50 millimeters diameter and a plate subjected to a torsional moment of 100 newton millimeters. The size of the weld is 5 millimeters and the diameter of the circular rod is 2 millimeters.*

- 2.3 newtons per square millimeter
- 3.5 newtons per square millimeter
- 4.5 newtons per square millimeter
- 5 newtons per square millimeter

*In a screw thread, the nominal diameter represents the __________.*

- major diameter
- minor diameter
- pitch diameter
- effective diameter

*The module of a gear is 10 millimeters and the number of teeth is 25. Calculate the pitch circle diameter of the gear.*

- 200 millimeters
**250 millimeters**- 400 millimeters
- 500 millimeters

*Calculate the bending moment of a circular fillet weld made between a rod of 20 millimeters diameter and a plate. The maximum bending stress on the fillet weld is 100 newtons per square millimeter. The size of the weld is 10 millimeters.*

- 2.2 x 10
^{5}newton millimeters - 3.5 x 10
^{5}newton millimeters - 5 x 10
^{5}newton millimeters - 6 x 10
^{5}newton millimeters

*In a full journal bearing, the angle of contact of the bearing with the journal is _________.*

- 90°
- 180°
- 270°
- 360°

*Calculate the crushing area per rivet, given that the diameter of the rivet hole is 20 millimeters and the thickness of the plate on which the riveting is done is 30 millimeters.*

- 600 square millimeters
- 400 square millimeters
- 900 square millimeters
- 430 square millimeters

*Calculate the centrifugal tension in a belt, given that the mass of the belt per unit length is 2 pounds and the linear velocity of the belt is 10 meters per second.*

- 100 newtons
- 200 newtons
- 300 newtons
- 400 newtons

*Calculate the attitude of a hydrodynamic journal bearing, given that the eccentricity of the bearing is 10 and the radial clearance is 5.*

- 0.5
- 2
- 15
- 50

*Calculate the diameter of the rivet hole if the thickness of the plate to be riveted is 9 millimeters.*

**18 millimeters**- 36 millimeters
- 27 millimeters
- 45 millimeters

*In a single start threaded worm gear, the lead is __________ the axial pitch.*

- two times
- equal to
- half of
- three times
- one fourth of

*Which type of nut among the following is used on objects which are subjected to sudden shocks and vibrations?*

- Jam nut
- Sawn nut
- Castle nut
- Penn nut
- Lock nut

*Calculate the shear modulus in a material which undergoes a shear strain of 10 meters. The shear stress applied on the material is 20 newtons per square meter.*

**2 newtons per meter**- 10 newtons per meter
- 200 newtons per meter
- 30 newtons per meter

*Calculate the tensile strength of a double transverse fillet weld, given that the size of the weld is 5 millimeters and the length of the weld is 10 millimeters. The shear stress on the weld is 100 newtons per square millimeter.*

- 5050 newtons
- 6060 newtons
- 7070 newtons
- 8080 newtons

*The modulus of elasticity of material A is 100 newtons per square meter and of material B is 200 newtons per square meter. Calculate the modular ratio between the two materials.*

- 3
**2**- 1
- 0.5

*If the diameter of the rivet hole is 10 millimeters, calculate the shearing area at the cross section of the rivet.*

- 78.5 millimeters
- 7.85 millimeters
- 785 millimeters
- 0.785 millimeters

*Which property among the following should have the lowest value while selecting a material for sliding contact bearing?*

- thermal conductivity
- compressive strength
- coefficient of thermal expansion
- bondability

*The value of the included angle for a V-belt is ____________.*

- 10° to 20°
**30° to 40°**- 50° to 60°
- 65° to 75°

*Calculate the solid length of a spring, given that the number of coils in the spring is 10 and the diameter of the spring wire is 2 millimeters.*

- 5 millimeters
- 10 millimeters
- 15 millimeters
- 20 millimeters

*The pitch of the rivet should never be less than ___________.
*

Here d is the diameter of the rivet

- d
- 2d
- 6d
- 8d

*The resistance of a bolt can be increased by ____________.*

- increasing the shank diameter of the bolt
- increasing the length of the bolt
- decreasing the shank diameter of the bolt
- decreasing the length of the bolt

*____________ are used to connect two non-parallel or intersecting shafts which are coplanar in nature.*

- Spur gears
- Helical gears
**Bevel gears**- Spiral gears

*__________ is fixed at one end and free at the other end.*

- Overhanging beam
- Continuous beam
- Simply supported beam
- Cantilever beam

*Which among the following types of bevel gear connects two shafts whose axes intersect at right angles?*

- Mitre gear
- Crown bevel gear
- Angular bevel gear
- Internal bevel gear