Legal Metrology • Mechanical Engineering Paper-II
Which of the following is a common material used for rolling elements in rolling element bearings?
A)
Brass
B)
Rubber
C)
Steel
D)
Aluminium
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Steel' (Option C).
Legal Metrology • Mechanical Engineering Paper-II
Which type of controller continuously adjusts the system’s input based on the error signal to maintain a setpoint?
A)
Proportional controller
B)
Integral controller
C)
Derivative controller
D)
Proportional-Integral-Derivative (PID) controller
A PID controller combines proportional, integral, and derivative action continuously based on error.
Legal Metrology • Mechanical Engineering Paper-II
What type of automatic control system has an open-loop configuration?
A)
A system that relies on feedback
B)
A system that does not adjust its output based on the input
C)
A system that continuously adjusts its output
D)
A system that requires manual intervention
Open-loop control uses no feedback to correct the output based on the input/result.
Legal Metrology • Mechanical Engineering Paper-II
In a gear drive system, what is the term for the ratio of the number of teeth on the driven gear to the number of teeth on the driving gear?
A)
Gear modulus
B)
Gear pitch
C)
Gear ratio
D)
Gear engagement
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Gear modulus' (Option A).
Legal Metrology • Mechanical Engineering Paper-II
Which type of bearing is often used in applications requiring high radial load capacity, such as in car wheel hubs?
A)
Thrust bearing
B)
Angular contact bearing
C)
Needle roller bearing
D)
Deep groove ball bearing
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Deep groove ball bearing' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
In field balancing, why is it important to correct unbalance in rotating machinery?
A)
To increase energy efficiency
B)
To simplify maintenance procedures
C)
To prevent excessive wear and damage to components
D)
To improve sound quality
Field balancing prevents excessive vibration, wear, and component damage during operation.
Legal Metrology • Mechanical Engineering Paper-II
In a chain drive system, what is responsible for transferring power from one sprocket to another?
A)
Chain links
B)
Belt tension
C)
Chain lubrication
D)
Chain tensioner
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'Belt tension' (Option B).
Legal Metrology • Mechanical Engineering Paper-II
What is the significance of identifying critical speeds in a rotating shaft system?
A)
To determine the shaft’s length
B)
To ensure the shaft operates at its maximum speed
C)
To avoid resonant vibrations that can lead to failure
D)
To increase the torque applied to the shaft
Critical speeds correspond to resonance; operation through/near them must be controlled to prevent excessive vibration.
Legal Metrology • Mechanical Engineering Paper-II
What type of interference fit joint involves pressing two mating parts together with a force to achieve a desired interference between them?
A)
Cotter fit
B)
Key fit
C)
Spline fit
D)
Press fit
A press fit is an interference fit assembled by pressing mating parts together.
Legal Metrology • Mechanical Engineering Paper-II
In vibration analysis, what is resonance?
A)
The point at which vibrations are minimal
B)
A state where the system’s natural frequency matches the excitation frequency
C)
A condition where vibrations are completely eliminated
D)
The point where the system reaches maximum speed
Resonance occurs when excitation frequency equals a system natural frequency, producing a large response.
Legal Metrology • Mechanical Engineering Paper-II
Governors are commonly used in engines and machines to:
A)
Control the flow of electricity
B)
Regulate the temperature of a system
C)
Maintain a constant speed under varying loads
D)
Convert rotary motion into linear motion
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Convert rotary motion into linear motion' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
Threaded fasteners, such as bolts and screws, are commonly used to create which type of joint?
A)
Cotter joint
B)
Key joint
C)
Spline joint
D)
Bolted joint
Bolts and screws form bolted/threaded joints.
Legal Metrology • Mechanical Engineering Paper-II
Which of the following is NOT a common type of belt used in belt drive systems?
A)
V-belt
B)
Flat belt
C)
Roller chain
D)
Timing belt
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'Timing belt' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
A clutch in a vehicle is an example of what type of device in a friction drive system?
A)
Coupling
B)
Belt drive
C)
Chain drive
D)
Power screw
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'Chain drive' (Option C).
Legal Metrology • Mechanical Engineering Paper-II
Which type of joint is typically used for connecting two shafts that are slightly misaligned and require flexibility?
A)
Cotter joint
B)
Key joint
C)
Spline joint
D)
Flexible joint
Flexible joints (like flexible couplings) accommodate slight misalignments between shafts.
Legal Metrology • Mechanical Engineering Paper-II
What is the primary advantage of a rolling element bearing over a hydrodynamic bearing?
A)
Higher load capacity
B)
Self-lubricating properties
C)
Lower cost
D)
Greater speed capability
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Greater speed capability' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
In gear design, what type of gear is known for its curved teeth, resulting in smoother and quieter operation compared to spur gears?
A)
Helical gear
B)
Spur gear
C)
Bevel gear
D)
Worm gear
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Helical gear' (Option A).
Legal Metrology • Mechanical Engineering Paper-II
When designing a threaded fastener joint, what is the term for the force that resists the tendency of the joint to rotate?
A)
Tensile force
B)
Shear force
C)
Torque
D)
Axial load
Torque is the moment that resists unwanted rotation of a threaded joint.
Legal Metrology • Mechanical Engineering Paper-II
Which of the following represents a kinematic constraint in a planar mechanism?
A)
The force required to move a link
B)
The maximum torque applied to a joint
C)
The relationship between velocities and positions of components
D)
The material strength of a component
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'The material strength of a component' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
Principal stresses represent:
A)
The maximum shear stress in a material
B)
The maximum and minimum normal stresses in a material
C)
The stresses that cause material failure
D)
The average stress in a material
Principal stresses are the maximum and minimum normal stresses at a point.
Legal Metrology • Mechanical Engineering Paper-II
Which law or principle is commonly used in dynamic analysis to relate the motion of a planar mechanism to the forces acting on it?
A)
Ohm’s Law
B)
Newton’s Second Law of Motion
C)
Boyle’s Law
D)
Kepler’s Third Law of Planetary Motion
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Boyle’s Law' (Option C).
Legal Metrology • Mechanical Engineering Paper-II
Which of the following mechanical components is primarily used for transmitting torque between a rotating shaft and a hub?
A)
Key
B)
Cotter
C)
Spline
D)
Welded joint
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Spline' (Option C).
Legal Metrology • Mechanical Engineering Paper-II
What is the primary advantage of using a worm gear in a power transmission system?
A)
High efficiency
B)
Bidirectional rotation capability
C)
Self-locking property
D)
Low cost
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Self-locking property' (Option C).
Legal Metrology • Mechanical Engineering Paper-II
Which type of cam has a shape that results in a continuous and smooth motion for the follower?
A)
Plate cam
B)
Groove cam
C)
Offset cam
D)
Disc cam
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Offset cam' (Option C).
Legal Metrology • Mechanical Engineering Paper-II
In the context of planar mechanisms, what does kinematic analysis primarily deal with?
A)
Forces and torques
B)
Motion and geometry
C)
Material properties
D)
Electrical circuits
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Material properties' (Option C).
