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WorksheetsBasics of Machine Design
Total questions: 30
Worksheet time: 30mins
The main objective of machine design is to:
Reduce material costl.
Ensure product reliability and efficiency
Increase product weight
Simplify appearance
Developmental design is based on:
Copying competitor design
Improvement of existing product with new materials
Trial and error
Random imagination
Ferrous materials mainly contain:
Copper
Iron
Aluminium
Zinc
Ergonomics in design deals with:
Product shape
Human comfort and usability
Machine strength
Cost control
Adaptive design involves:
Modifying existing designs
Using standard components
Developing from scratch
Ignoring previous data
Types of loads acting on machine components include:
Static load
Impact load
Fatigue load
Magnetic load
Stress-strain curve helps to determine:
Density of material
Ductility and toughness
Weight
Shape
Bending Moment Diagram (BMD) shows:
Distribution of bending moment along beam
Change in load
Stress-strain relation
Reaction at supports
A steel rod 10 mm in diameter is subjected to a tensile load of 10 kN.
Find the stress induced.
97 MPA
127 MPA
168 MPA
213 MPA
A brass rod elongates by 0.5 mm under a tensile load.
If original length = 500 mm, find the strain.
0.0001
0.001
1
0.1
A riveted joint is generally:
Temporary
Permanent
Friction type
Threaded
The stiffness of a spring is defined as:
Stress per unit strain
Energy per unit load
Length per diameter
Load per unit deflection
Functions of a spring are to:
Store mechanical energy
Absorb shock or vibration
Transmit torque
Maintain contact force between parts
The main function of a fastener is to:
Transmit power
Increase aesthetics
Join machine parts securely
Reduce friction
Helical springs are generally used for —
Energy storage and shock absorption
Transmitting torque
Support Part
Joining two shafts
The function of a key is to:
Hold bearing
Transmit torque between shaft and hub
Reduce speed
Support axial load
A ball bearing has a dynamic load capacity C=25 000 NC = 25\,000 \,NC=25000N and is subjected to an equivalent load P=10 000 NP = 10\,000 \,NP=10000N.
Find the L10 bearing life in million revolutions.
22.12
10.78
15.63
18.25
Functions of a bearing include:
Supporting rotating shafts
Reducing friction
Assisting load transmission
Maintaining torque
Flexible couplings are used to:
Allow slight misalignment
Increase speed
Reduce torque
Maintain speed
The main function of a bearing lubricant is:
Increase wear
Increase load
Clean shaft
Reduce friction and temperature
Advantages of V-belt drives are:
Compact design
Less slippage
Shock absorption
Suitable for very long distances
Gears are used to:
Change torque
Change speed ratio
Transmit power between shafts
Reduce friction
A flat belt drive connects two pulleys.
Driver pulley diameter D1=300 mm
Speed of driver N1=900 rpm
Speed of driven pulley N2=450 rpm
Find the diameter of the driven pulley (D₂).
588 mm
569 mm
574 mm
595 mm
A roller chain drive has a driver sprocket with 17 teeth running at 600 rpm.
The driven sprocket runs at 300 rpm.
Find the number of teeth on the driven sprocket
38
32
36
34
Which one of the following is a positive drive?
Flat Belt Drive
V-Belt Drive
Rope Drive
Roller Chain Drive
The speed of the sprocket reduces as the chain pitch _____________ for a given number of teeth.
increases
decrease
remains same
can't say
Role of Artificial Intelligence in design includes:
Optimization of geometry
Drafting
Prediction of failures
Generative design
Benefits of applying automation in design are:
Increase work
Reduced human error
Improved accuracy
Faster design iterations
Assembly of components is required for:
Design presentation
Product realization
Simulation
Safety testing
Evaluation in the design process is:
Preparing detailed drawings
Manufacturing the product
Comparing different ideas to select the best one
Promoting or marketing the design
