Introduction to Mechanical Engineering MCQs (Part-10)
What is the primary function of a gearbox?
A Control speed
B Transfer power
C Convert heat
D Store energy
A gearbox is used to transmit mechanical power between components. It can change the speed, torque, and direction of rotation, which is essential in machines like vehicles, industrial equipment, and generators.
Which component helps to convert rotary motion into linear motion?
A Gear
B Pulley
C Lever
D Cam
A cam converts rotary motion into linear motion or oscillating motion through its shape and design. It is widely used in engines, automatic machines, and other mechanical systems where specific motion patterns are required.
What is the purpose of CAD software in mechanical design?
A Monitor speed
B Create designs
C Test materials
D Measure forces
CAD (Computer-Aided Design) software is used to create, modify, and optimize detailed designs for mechanical systems and components. It allows engineers to visualize and simulate their designs in 2D or 3D to ensure accuracy before manufacturing.
Which property describes a material’s ability to withstand deformation under stress?
A Strength
B Ductility
C Elasticity
D Hardness
Strength is the ability of a material to resist deformation or failure under applied stress. Materials with high strength, such as steel, are used in construction and manufacturing of structural components that need to bear heavy loads.
What is the role of a bearing in machinery?
A Control motion
B Increase speed
C Support rotation
D Absorb shock
Bearings are mechanical components used to support rotating parts, reduce friction, and enable smooth motion. They are essential in machinery like motors, wheels, and turbines to ensure efficient operation and prevent wear.
Which energy conversion occurs in a heat engine?
A Chemical to electrical
B Heat to mechanical
C Electrical to mechanical
D Kinetic to potential
Heat engines convert thermal energy into mechanical energy by using the expansion of gases or liquids. This conversion is used in machines like internal combustion engines, steam engines, and turbines to produce work or electricity.
What does the term “fluid mechanics” deal with?
A Electrical energy
B Energy conservation
C Material properties
D Fluid motion
Fluid mechanics is the study of the behavior of fluids (liquids and gases) in motion and at rest. It is critical for designing systems like pumps, turbines, HVAC systems, and fluid transportation pipelines.
What is the primary purpose of a valve in a fluid system?
A Regulate temperature
B Store energy
C Control flow
D Measure pressure
A valve is used to control the flow of fluids or gases in a system. It can regulate, stop, or redirect the flow in pipes, engines, and machinery, ensuring efficient operation of hydraulic, pneumatic, and plumbing systems.
What is the function of an actuator in mechanical systems?
A Control speed
B Increase power
C Convert energy to motion
D Measure temperature
An actuator converts various forms of energy, such as electrical, hydraulic, or pneumatic, into mechanical motion. It is widely used in robotics, industrial automation, and machinery to perform tasks like moving parts or adjusting mechanisms.
What is the purpose of insulation in thermal systems?
A Reduce heat loss
B Increase speed
C Store energy
D Control pressure
Insulation is used to minimize heat transfer in thermal systems. It helps maintain the desired temperature, reduces energy consumption, and improves efficiency in systems like boilers, refrigeration units, and home heating systems.
Which machine component is used to transmit rotational motion between shafts?
A Bearing
B Gear
C Pulley
D Spring
Gears are used to transmit motion and torque between shafts. They can change the speed, direction, and torque of rotating machinery, and are commonly used in automotive systems, industrial machines, and clocks.
What is the role of a governor in an engine?
A Control fuel intake
B Reduce vibration
C Regulate speed
D Measure power
A governor regulates the speed of an engine by automatically adjusting the fuel supply or other system variables to maintain a constant speed, even as the load on the engine changes. It is critical for engine stability.
What is the primary purpose of vibration analysis in machinery?
A Increase efficiency
B Measure power
C Detect faults
D Regulate speed
Vibration analysis helps detect irregularities in machinery, such as misalignment, imbalance, or wear. By analyzing vibration patterns, engineers can identify potential issues early, allowing for proactive maintenance and reducing the risk of mechanical failure.
What is the purpose of a flywheel in an engine?
A Store energy
B Increase torque
C Regulate speed
D Measure vibration
A flywheel stores rotational energy and helps smooth out fluctuations in an engine’s power delivery. It absorbs excess energy during high-speed rotation and releases it during low-speed operation, ensuring smoother and more consistent engine performance.
What is the purpose of using welding in manufacturing?
A Increase power
B Join materials
C Measure temperature
D Reduce weight
Welding is a process used to join two or more materials, typically metals or thermoplastics, by applying heat and pressure. It creates strong, durable bonds used in construction, automotive, and manufacturing industries for creating complex parts and structures.