Legal Metrology • Mechanical Engineering Paper-III
A dummy activity in a net work diagram
A)
is represented by a dotted line
B)
isan artificial activity
C)
does not consume time or resources
D)
all ofthese
A dummy activity is artificial, uses no time or resources, and is drawn with a dotted line in network diagrams.
Legal Metrology • Mechanical Engineering Paper-III
The interchangeability can be achieved by
A)
standardisation
B)
better process planning
C)
bonus plan
D)
better product planning
Standardization of dimensions and parts is critical to achieving interchangeability.
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 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
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 advantage of a chain drive over a belt drive?
A)
Lower cost
B)
Higher efficiency
C)
Smoother operation
D)
Easier maintenance
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Higher efficiency' (Option B).
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
What is the primary goal of balancing rigid rotors in machinery?
A)
To increase the speed of rotation
B)
To reduce vibration and ensure smooth operation
C)
To add weight to the rotor for stability
D)
To decrease the energy consumption
Rotor balancing reduces unbalanced centrifugal forces and therefore vibration and wear.
Legal Metrology • Mechanical Engineering Paper-II
What is the primary function of a cam in a mechanical system?
A)
To transmit power between shafts
B)
To convert rotary motion into reciprocating motion or vice versa
C)
To store energy for later use
D)
To regulate the speed of a machine
A cam converts rotary input to a prescribed reciprocating/oscillating follower motion, or vice versa.
Legal Metrology • Mechanical Engineering Paper-II
Which type of belt drive is known for its high efficiency and is commonly used in automotive engines?
A)
Flat belt drive
B)
V-belt drive
C)
Serpentine belt drive
D)
Timing belt drive
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'V-belt drive' (Option B).
Legal Metrology • Mechanical Engineering Paper-II
Which type of gear has teeth that are parallel to the axis of rotation and is known for transmitting motion smoothly and quietly?
A)
Spur gear
B)
Helical 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 B).
Legal Metrology • Mechanical Engineering Paper-II
In wire rope design, what is the term for the number of wires bundled together to form a strand?
A)
Strand diameter
B)
Wire pitch
C)
Laylength
D)
Wire gauge
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Strand diameter' (Option A).
Legal Metrology • Mechanical Engineering Paper-II
In automatic control systems, what is the primary function of a controller?
A)
To sense the system’s output
B)
To compare the actual output to the desired setpoint
C)
To supply power to the system
D)
To monitor system temperature
A controller compares the actual/feedback value with the reference setpoint and acts on the error.
Legal Metrology • Mechanical Engineering Paper-II
What is the primary function of a shaft in a power transmission system?
A)
To provide mechanical advantage
B)
To change the direction of rotation
C)
To support and transmit torque between components
D)
To reduce friction in the system
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'To reduce friction in the system' (Option D).
Legal Metrology • Mechanical Engineering Paper-II
Critical speed in rotating machinery is associated with:
A)
The point at which the machine should be turned off
B)
The point at which vibrations become negligible
C)
The point at which resonance occurs
D)
The point at which maximum power output is achieved
Critical speed corresponds to resonance between shaft rotation and a natural frequency.
Legal Metrology • Mechanical Engineering Paper-II
Flywheels are crucial in machines that require a steady output of power because they:
A)
Increase the overall weight of the machine
B)
Store kinetic energy and release it during fluctuations in power demand
C)
Convert mechanical energy into electrical energy
D)
Regulate the flow of fluids in the system
A flywheel stores rotational kinetic energy and releases it when instantaneous power demand exceeds input.
Legal Metrology • Mechanical Engineering Paper-II
When designing a power screw, which parameter determines how much axial force can be applied to the screw without causing it to fail?
A)
Thread pitch
B)
Screw diameter
C)
Lead angle
D)
Thread strength
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Screw diameter' (Option B).
Legal Metrology • Mechanical Engineering Paper-II
What type of bearing relies on a thin film of lubricating fluid to separate moving parts and reduce friction?
A)
Rolling element bearing
B)
Hydrodynamic bearing
C)
Thrust bearing
D)
Sleeve bearing
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Hydrodynamic bearing' (Option B).
Legal Metrology • Mechanical Engineering Paper-II
In field balancing, what is the primary tool used to detect unbalance in a rotating machine?
A)
Microscope
B)
Stethoscope
C)
Vibration analyser
D)
Thermometer
A vibration analyser measures the frequency/amplitude signatures used to identify rotor unbalance.
Legal Metrology • Mechanical Engineering Paper-II
Wire ropes are commonly used in applications that require:
A)
Low tensile strength
B)
Flexibility and resistance to bending
C)
Low weight-bearing capacity
D)
High speed transmission
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Low weight-bearing capacity' (Option C).
Legal Metrology • Mechanical Engineering Paper-II
Whirling of shafts occurs when:
A)
The shaft is perfectly balanced
B)
The shaft is subjected to high temperatures
C)
The shaft rotates at a critical speed
D)
The shaft is lubricated improperly
Whirling is a resonance phenomenon occurring when shaft speed approaches a critical speed.
Legal Metrology • Mechanical Engineering Paper-II
What is the primary purpose of gears in a power transmission system?
A)
To support the weight of rotating equipment
B)
To transmit power between parallel or intersecting shafts
C)
To provide flexibility in shaft alignment
D)
To reduce friction between moving parts
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'To support the weight of rotating equipment' (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
What is the primary purpose of a coupling in a mechanical system?
A)
To transmit power between two shafts at a constant speed
B)
To allow for misalignment between two shafts
C)
To control the engagement and disengagement of power transmission
D)
To increase the efficiency of a belt drive
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'To allow for misalignment between two shafts' (Option B).
Legal Metrology • Mechanical Engineering Paper-II
Which type of gear is known for its ability to change the direction of rotation between two shafts at right angles to each other?
A)
Spur gear
B)
Helical 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 B).
