Legal Metrology • Mechanical Engineering Paper-II
What is the gear ratio of a gear train consisting of a driver gear with 20 teeth and a driven gear with 40 teeth?
A)
1:2
B)
2:1
C)
20:40
D)
40:20
Gear ratio (driven/driver) = 40/20 = 2, so driver:driven speed ratio is 1:2.
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
Which type of governor uses rotating weights to control the speed of an engine?
A)
Centrifugal governor
B)
Flyball governor
C)
Hydraulic governor
D)
Pneumatic governor
A flyball/centrifugal governor controls engine speed using rotating centrifugal weights.
Legal Metrology • Mechanical Engineering Paper-II
What is the primary role of a governor in an engine?
A)
To balance the engine’s components
B)
To control fuel injection
C)
To regulate engine speed or output
D)
To improve fuel efficiency
A governor regulates engine speed/output under changing load.
Legal Metrology • Mechanical Engineering Paper-II
What graphical method is used to determine principal stresses and visualize stress transformations?
A)
Hooke’s Law
B)
Mohr’s Circle
C)
Pascal’s Triangle
D)
Euler’s Formula
Mohr’s circle graphically shows principal stresses and stress transformation.
Legal Metrology • Mechanical Engineering Paper-II
When selecting a material for a high-torque shaft, which property is most important to consider?
A)
Density
B)
Elastic modulus
C)
Thermal conductivity
D)
Yield strength
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Density' (Option A).
Legal Metrology • Mechanical Engineering Paper-II
What is the primary purpose of a flywheel in a machine?
A)
To control the engagement of gears
B)
To store and release energy to maintain a constant speed
C)
To convert rotary motion into reciprocating motion
D)
To regulate the flow of fluids in a system
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'To regulate the flow of fluids in a system' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
Linear vibration analysis in mechanical systems primarily deals with:
A)
Rotary motion
B)
Oscillatory motion along a straight line
C)
Circular motion
D)
Irregular, unpredictable motion
Linear vibration analysis studies oscillatory motion about an equilibrium position using linearized equations.
Legal Metrology • Mechanical Engineering Paper-II
What type of mechanical component is commonly used for fastening two parts together, preventing relative axial motion?
A)
Cotter
B)
Key
C)
Spline
D)
Welded joint
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'Spline' (Option C).
Legal Metrology • Mechanical Engineering Paper-II
When designing a threaded fastener joint, what is the primary purpose of the washer under the nut or bolt head?
A)
To increase axial load capacity
B)
To prevent corrosion
C)
To distribute the load over a larger area
D)
To make the joint easier to disassemble
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'To make the joint easier to disassemble' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
When two gears of different sizes mesh together, what effect does it have on the speed of the driven gear compared to the driving gear?
A)
The speed increases
B)
The speed decreases
C)
The speed remains constant
D)
The speed reverses direction
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'The speed reverses direction' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
What type of joint is created by permanently fusing two pieces of metal together through the application of heat?
A)
Cotter joint
B)
Key joint
C)
Spline joint
D)
Welded joint
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Key joint' (Option B).
Legal Metrology • Mechanical Engineering Paper-II
Which type of wire rope construction is characterized by a central core surrounded by multiple layers of helically wound wires in alternating directions?
A)
Fiber core
B)
Seale construction
C)
Warrington construction
D)
Filler wire construction
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Seale construction' (Option B).
Legal Metrology • Mechanical Engineering Paper-II
In a gear train, what is the term for the gear that receives power from the input source (driving gear)?
A)
Driver gear
B)
Idler gear
C)
Intermediate gear
D)
Driven gear
Option A is correct: Driver gear
Legal Metrology • Mechanical Engineering Paper-II
What is the primary objective of dynamic analysis in planar mechanisms?
A)
To study the geometry of linkages
B)
To determine the kinematic constraints
C)
To analyse the forces and torques involved during motion
D)
To study the material properties of components
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'To study the material properties of components' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
What is the primary focus of two-dimensional stress analysis?
A)
Determining thermal stresses
B)
Analysing stresses in two different materials
C)
Evaluating stresses in two perpendicular directions
D)
Studying stress in three dimensions
Two-dimensional stress analysis considers two mutually perpendicular in-plane normal/shear stress components.
Legal Metrology • Mechanical Engineering Paper-II
When performing kinematic analysis of a planar mechanism, what does the term “degrees of freedom” refer to?
A)
The number of joints in the mechanism
B)
The number of links in the mechanism
C)
The number of independent variables needed to define its position
D)
The range of motion of each joint
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'The range of motion of each joint' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
Splines are often used in mechanical designs to:
A)
Prevent axial movement between parts
B)
Transmit torque and axial loads
C)
Allow for easy disassembly
D)
Enhance weld strength
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Prevent axial movement between parts' (Option A).
Legal Metrology • Mechanical Engineering Paper-II
When balancing a single-cylinder engine, where is the correction mass typically added to achieve balance?
A)
Cylinder head
B)
Flywheel
C)
Crankshaft
D)
Exhaust system
Crankshaft correction masses are used to balance reciprocating/rotating engine forces.
Legal Metrology • Mechanical Engineering Paper-II
In a hydrodynamic bearing, what is the primary factor that generates the fluid film between the bearing surfaces?
A)
Lubricant viscosity
B)
Rolling elements
C)
Magnetic forces
D)
Heat conduction
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Rolling elements' (Option B).
Legal Metrology • Mechanical Engineering Paper-I
During peak load periods, the best method for compressor control is
A)
relief valve
B)
variable speed
C)
start-stop motor
D)
constant speed unloading
In the context of Mechanical Engineering, the most appropriate and technically accurate answer is 'constant speed unloading' (Option D).
Legal Metrology • Mechanical Engineering Paper-I
Which of the following is the extensive property of a thermodynamic system?
A)
viscosity
B)
specific enthalpy
C)
density
D)
potential energy
Potential energy depends on the total mass of the system, making it an extensive property.
Legal Metrology • Mechanical Engineering Paper-I
For the same operating temperature limits, the coefficient of performance (COP) of heat pump equals
A)
COP of refrigerators
B)
1 + COP of refrigerators
C)
COP of refrigerator - 1
D)
1 / COP of refrigerator
COP_HP=COP_R+1 for the same temperature limits.
Legal Metrology • Mechanical Engineering Paper-I
For incompressible flow diverging section acts as diffuser in the down-stream for
A)
sonic state only
B)
subsonic state only
C)
supersonic state
D)
both sonic and supersonic
In the context of Mechanical Engineering, the most appropriate and technically accurate answer is 'subsonic state only' (Option B).
Legal Metrology • Mechanical Engineering Paper-I
If Re is the Renold’s number, the coefficient of friction for laminar flow is
A)
16/Re
B)
8/Re
C)
64/Re
D)
128/Re
For laminar pipe flow, the Fanning friction factor is 16/Re.
