Let’s strengthen your Mechanical concepts ✨
1. Which of the following two disciplines are tied by a common database?
A) CAD and CAM
B) drafting and documentation
C) documentation and geometric modeling
D) none of the mentioned
Explanation: Because of their joint benefits, computer-aided design and computer-aided manufacturing are often combined into CAD/ CAM systems. This combination allows the transfer of information from the design stage to the stage of planning for manufacture, without the need to reenter the data on part geometry manually.
2.Which of the following software is used to provide the users with various functions to perform geometric modeling and construction?
A) graphics software
B) graphics software
C) operating software
D) application software
Explanation: ee
What is the relationship between CAD/CAM?
A) manufacturing and marketing
B) science and engineering
C) design and marketing
D) design and manufacturing
Explanation:
Which of the following device is mostly associated with automation?
A) NC machine
B) flexible manufacturing
C) computer graphics workstation
D) robots
Explanation:
Why designs are periodically modified?
A) to strive for zero-based rejection and waste
B) to make products easier and faster to manufacture
C) to improve product performance
D) all of the mentioned
Explanation: Designs are periodically modified to
i) Consider new materials and processes that are continually being developed
ii) Strive for zero-based rejection and waste
iii) Improve product performance
iv) Make products easier and faster to manufacture
Which of the following are the chemical properties of good product material?
A) corrosion
B) surface treatment
C) oxidation
D) all of the mentioned
Explanation: Chemical properties of primary concern in manufacturing are susceptibility to oxidation and corrosion and to the various surface-treatment processes.
What is fluid mechanics?
A) Study of fluid behaviour at rest
B) Study of fluid behaviour in motion
C) Study of fluid behavior at rest and in motion
D) Study of fluid behavior at rest and in motion
Explanation: The study of fluid behaviour (liquids, gases, blood, and plasmas) at rest and in motion is known as fluid mechanics. Fluid mechanics has numerous applications in mechanical and chemical engineering, as well as biological and astrophysical systems.
Which of the following is the basic principle of fluid mechanics?
A) Momentum principle
B) Energy equation
C) Continuity equation
D) All of the mentioned
Explanation: The continuity equation (i.e. mass conservation), the momentum principle (or momentum conservation), and the energy equation are the three basic fluid mechanics principles.
Which of the following method is most commonly used in fluid mechanics for analysis?
A) Eulerian Method
B) Control volume analysis
C) Langragian method
D) None of the mentioned
Explanation: In Eulerian method,we describe velocity, acceleration pressure etc at a point in flow field.hence, it is also most commonly used in fluid mechanics.
Which among the following is referred to as the temperature at a stagnation point in the flow of fluids in fluid mechanics and thermodynamics.
A) Absolute temperature
B) Maximum temperature
C) Stagnation temperature
D) Hydraulic temperature
Explanation: Stagnation temperature is the temperature at the stagnation point of the flow of fluids. In thermodynamics and fluid mechanics, these terms find application. At a stagnation point the speed of the fluid is zero and all of the kinetic energy has been converted to internal energy and is added to the local static enthalpy.
When a fluid is subjected to resistance, it undergoes a volumetric change due to __________
A) Cohesion
B) Strain
C) Compressibility
D) Adhesion
Explanation: Compressibility is defined as a measure of relative change in volume of a fluid. In fluid mechanics, it is also called as isothermal compressibility due to increase in pressure and temperature.
Which of the following equation must be perfunctorily satisfied while dealing with fluid flow problems?
A) Newton’s third law
B) Law of conservation of momentum
C) Continuity equation
D) Newton’s second law
Explanation: Continuity equation must be perfunctorily satisfied while dealing with fluid flow problems.
Indicated power of a 4-stroke engine is equal to ___________
A) 4pLAN
B) pLAN/2
C) pLAN
D) 2pLAN
Explanation: Indicated power of a 4-stroke engine is equal to pLAN/2.
where p = mean effective pressure,
L = stroke
A = area of piston and
N = rpm of engine.
The thermal efficiency of diesel engines is about ___________
A) 65%
B) 50%
C) 80%
D) 70%
Explanation: The thermal efficiency of diesel engines is about 70% while the thermal efficiency of petrol and gas engines is about 30%.
The major loss in a S.I. engine is due to ____________
A) variation in specific heat and chemical equilibrium
B) pumping
C) exhaust blow down
D) incomplete combustion
Explanation: The major loss in a S.I. engine is due to variation in specific heat and chemical equilibrium while the major loss in a C.I. engine is loss due to incomplete combustion.
Which of the following does not relate to spark ignition engine?
A) Spark plug
B) Carburetor
C) Fuel injector
D) Ignition coil
Explanation: Fuel injector is not related to spark ignition engine as there is no fuel injection in spark ignition engine.
