Mechanical Engineering MCQs
Mechanical Engineering MCQs
Answer these 200+ Mechanical Engineering MCQs and assess your grip on the subject of Mechanical Engineering.
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1: What aspect of machine virabtion is described in cycles per second?
A. Regularity
B. Consistency
C. Continuity
D. Frequency
2: Creep is the tendency of a solid to:
A. deform permanently under mechanical stress
B. undergo elastic deformation
C. fracture under extreme loads
D. deform due to electromagnetic forces
3: As related to steam production, what do the letters BHP stand for?
A. Boiler heat production
B. Boiler horsepower
C. Burner heat potential
D. Burner heat product
4: Which fan configuration is designed to add energy to airflow passing straight through the fan blades?
A. Centrifugal fan configuration
B. Axial fan configuration
C. High velocity fan configuration
D. Vortex fan configuration
5: What must happen to fuel oil at the burner for efficient combustion?
A. Desintigration
B. Oxygen depletion
C. Atomization
D. Conical spraying
6: What is the term for the ability of a material to withstand the force of being pulled apart?
A. Tensile strength
B. Shear strength
C. Elasticity
D. Flexibility
7: What is a term for heat transfer between two objects in contact, driven by a constant temperature difference?
A. convection
B. steady state conduction
C. constant diffusion
D. advection
8: The reduction in effectiveness of a vehicular brake is called:
A. smooth-out
B. drag
C. brake fade
D. force fade
9: Which of these processes involves melting the workpieces?
A. soldering
B. brazing
C. welding
10: What is the lowest stress that produces a permanent deformation in a material?
A. strain threshhold
B. fatigue
C. fracture threshold
D. Yield strength
11: Which machine tool rotates the workpiece on its axis?
A. drill
B. milling machine
C. lathe
12: Which fieldlines are instantaneously tangent to the velocity vector of flow?
A. timelines
B. streaklines
C. streamlines
D. pathlines
13: What describes the effect of a material expanding in the directions perpendicular to its direction of compression?
A. Poisson Effect
B. Bellowing effect
C. Newton effect
D. Accordion effect
14: What is the density of water?
A. 500 kg/m^3
B. 4000 kg/m^3
C. 1 kg/m^3
D. 1000 kg/m^3
15: What is an upward force exerted by a fluid that opposes the weight of an immersed object?
A. buoyancy
B. capillary action
C. surface tension
16: Why are fan assemblies usually designed with spring isolators?
A. To increase airflow
B. To eliminate noise
C. To minimize vibration
D. To reduce friction
17: True or False: Vapour compression used in most household refrigerators is a non-cyclic process.
A. True
B. False
18: How is the heat energy that changes the state of an object but not its temperature described?
A. Superheat
B. Latent heat
C. Sensible heat
D. Thermal heat
19: What does ASME stand for?
A. Association for Service of Mechanical Equipment
B. American Standards for Mechanical Equipment
C. American Society of Mechanical Engineers
D. Association of Science and Materials Engineering
20: What is the rotational force exerted by a spinning shaft?
A. Radial velocity
B. Momentum
C. Inertia
D. Torque
21: Which device is used to store rotational energy?
A. generator
B. flywheel
C. motor
22: Which if these is NOT a component of aerodynamic force?
A. pinch
B. drag
C. thrust
D. lift
23: What is the measure of a fluid's resistance to gradual deformation by shear stress or tensile stress?
A. viscosity
B. fluidity
C. buoyancy
D. fluid tension
24: What are the units for Reynold's number?
A. m^3/s
B. kg/m^3
C. no dimensions
D. Pascal second
25: What is defined as the ratio of tensile stress to tensile strain?
A. shear modulus
B. Pascal's ratio
C. bulk modulus
D. Young's modulus
26: Which value must be calculated into piping system designs?
A. Expansion denominator
B. Expansion derivative
C. Expansion estimate
D. Expansion coefficient
27: What is the result of continous cyclic loads on a metal object?
A. Increased pliability
B. Hardened metal
C. Metal fatigue
D. Softened metal
28: The set of equations used to describe motion?
A. Kinesetic
B. Newtonian
C. Motive
D. Kinematic
29: True or False: Silicon can be used to make microelectromechanical systems.
A. True
B. False
30: True or False: A perfect Carnot heat engine cannot be built in reality.
A. False
B. True
31: Newton's law of cooling states that the rate of heat loss of a body is proportional to:
A. the absolute temperature of the body
B. the absolute temperature of the surrounding
C. the difference in temperatures between the body and its surroundings
32: Which of these manufacturing processes involves pouring liquid metal into a mould?
A. casting
B. forging
C. forming
D. welding
33: Total mechanical energy is the sum of what two forms of energy?
A. Kinetic Energy and Potential Energy
B. Used energy and unused energy
C. Mechanical energy and electrical energy
D. Static energy and dynamic energy
34: True or False: All matter with a temperature greater than absolute zero emits thermal radiation.
A. True
B. False
35: How do we describe the property of an object or material which will restore it to its original shape after distortion?
A. Strength
B. Elasticity
C. Rigidity
D. Flexibility
36: What are the three basic methods of heat tranfser?
A. Thermal, Osmosis and Linear
B. Steam, Flame and Hydronic
C. Tactile, Friction, and Combustion
D. Conduction, Convection and Radiation
37: What term describes the calculations related to objects with greater than zero velocity?
A. Moving parts
B. Actives
C. Dynamics
D. Statics
38: What is a tool used for stamping metal by a press?
A. clamp
B. jig
C. mould
D. die
39: What is one advantage of multi-stage centrifugal pump configurations over single-stage centrifugal pump configurations?
A. Higher pressures can be derived
B. Lower pressures can be derived
C. Lower volumes can be derived
D. Higher volume can be derived
40: Which of these is a turbine for hydro power?
A. Carnot wheel
B. Ericsson wheel
C. Pelton wheel
41: Which type of gear meshing should be employed to transmit torque to a linear force?
A. Rack and Pinion
B. Epicyclic gear
C. Helical gear
D. Bevel gear
42: How many degrees of freedom does a rigid body have in three dimensional space?
A. six
B. one
C. four
D. three
43: Which mechanism can convert rotational motion to reciprocating motion?
A. spring
B. gear train
C. pendulum
D. slider-crank
44: What is the simple mechanics description of a force acting upon an object to cause a displacement of the object?
A. Movement
B. Work
C. Action
D. Motion
45: Which stress acts in parallell with the cross section of a material?
A. shear
B. compression
C. normal
D. tension
46: What is the unit of measurement defined as "the amount of heat needed to raise 1 pound of water 1 degree"?
A. Farenheit
B. Watt
C. BTU
D. Ampere
47: What is constant in an isochoric process?
A. temperature
B. pressure
C. volume
48: Which of these factors least affects the heat dissipation by a heat sink?
A. surface area exposed to air
B. material of heat sink
C. mechanical pressure on heat sink
49: Which term is used to describe the angle of the cutting face relative to the cutting work?
A. Slice angle
B. Strike angle
C. Leverage angle
D. Rake angle
50: What type of deformation may take place when large amounts of tensile strain are localized in a small area of a material?
A. Crinkling
B. Smashing
C. Necking
D. Crunching
51: Which chemical can be added to a closed loop system to prevent freezing?
A. Glycol
B. Molybdate
C. Nitrite
D. Ammonia
52: What is the purpose of simple machines such as pulleys and levers?
A. To create mechanical advantage.
B. To establish geometric ratios
C. To lift heavy objects
D. Levers and pulleys are not considered simple machines.
53: What force describes the principle of Newton's second Law of Motion that objects naturally resist changes to their course of motion?
A. Inertia
B. Acceleration
C. Balance
D. Momentum
54: What is the function of a feeler gauge?
A. to measure pitch of screw
B. To check thickness of clearance
C. to measure surface roughness
D. To measure radius of circular rod
55: When a material is compressed in one direction, it tends to expand in the other two directions perpendicular to the direction of compression. What is this effect called?
A. transverse effect
B. Bulk material change
C. Young's Effect
D. Poisson Effect
56: What is another name for a gear traing's torque ratio?
A. linkage constant
B. mechanical advantage
C. speed factor
57: Which of these is NOT a state function?
A. pressure
B. heat
C. temperature
D. volume
58: What can be done to increase the capacity of a plate frame heat exchanger?
A. Install additional plates
B. Increase motor horsepower
C. Increase temperature delta
D. Increase motor rpm
59: What kind of an engine does an Otto cycle describe?
A. compression ignition
B. hydraulic ignition
C. spark ignition
60: What is designed into gear sets to provide the proper amount of teeth clearance to avoid binding?
A. Angled openings
B. Dead space
C. Gapped teeth
D. Backlash
61: Which is the most common stress used to evaluate the yielding of ductile materials?
A. Shear Stress
B. Principle Stress
C. Von Mises Stress
D. Coulomb-Mohr
62: What is the term for the cutting process where the tool and cutting surface are perpendicular to each other?
A. Orthogonal cutting
B. Diagonal cutting
C. Perpendicular cutting
D. Side cutting
63: Which of these is a method used to evaluate new product ideas?
A. CAD simulation
B. SWOT analysis
C. MATLAB simulatioin
64: Place these in the correct order for torsion: T,L,J,theta
A. JL/Ttheta
B. TL/Jtheta
C. Ltheta/JT
65: Approximately how much does one gallon of water weigh?
A. .433 lbs
B. 16.24 lbs
C. 64 lbs
D. 8.33 lbs
66: What is the maximum allowable working pressure for a low pressure steam boiler?
A. 5 psi
B. 50 psi
C. 15 psi
D. 1 psi
67: How do we describe the process for determining the magnitudes of the components of a vector directed in two dimensions?
A. Vector Resolution
B. Vector Assesment
C. Vector calculus
D. Vector Calculation
68: Which law of thermodynamics captures the idea that higher temperature materials will always gravitate toward cooler temperatures?
A. The second law of Thermodynamics
B. The third law of Thermodynamics
C. The first law of Thermodynamics
D. The fourth law of Thermodyamics
69: What is the force that prevents a material from being torn apart?
A. Adhesive strength
B. Tensile strength
C. Shear strength
D. Cohesive strength
70: According to Newton's first law, if the vector sum of all forces acting on a body is zero, then its:
A. acceleration is constant
B. velocity is zero
C. velocity is constant
71: What is the name of the 3 valve configuration designed to continuously vent unwanted fuel away from it's point of use?
A. Block and bleed
B. Closed and vented
C. Stop and block
D. Normally open normally closed
72: What are the units for a moment of inertia?
A. radians per second
B. kg/m^2
C. kg.m^2
D. Newton meter
73: True or False: The force needed to extend a spring by a certain distance is inversely proportional to that distance.
A. False
B. True
74: According to Bernoulli's principle, what happens in an ideal fluid with a decrease in pressure?
A. increase in speed
B. increase in volume
C. decrease in speed
75: What quality should shock resisting steel posses?
A. High Ductility
B. High Toughness
C. High Hardness
D. High Stiffness
E. High Shear Strength
76: Cooling tons are calculated as the amount of heat energy needed to turn one ton of ice into water over what time period?
A. 1 hour
B. 24 hours
C. 8 hours
D. 12 hours
77: What two fuel types are commonly incorporated into dual fuel burner design?
A. Propane and natural gas
B. Coal and wood
C. Natural gas and fuel oil
D. Gasoline and fuel oil
78: What machinability rating has the American Iron and Steel Institute (AISI) given to AISI No. 1112 carbon steel?
A. 0%
B. 50%
C. 100%
D. 25%
79: What type of fuel oil pump will deliver consistent pressure and volume with minimal fluctuations to combustion eqiupment?
A. A positive displacement pump
B. A single stage centrifugal pump
C. A multi-stage centrifugal pump
D. A recriprocating pump
80: A four bar linkage system meets the Grashof condition if:
A. The shortest link can rotate fully with respect to a neighboring link.
B. The crank length is greater than the rocker length.
C. The mechanism contains more than one degree of freedom.
D. The coupler curve follows a symmetrical path.
81: In a heat exchanger application, what value does the term "temperature delta" refer to?
A. The resultant temperture of the heat exchange process
B. The heat energy lost through system operation
C. The difference in temperature between supply and return on one side of the system
D. The difference in temperature between the two sides exchanging heat energy
82: Cogeneration commonly combines the production of what two forms of energy?
A. Electricity and Steam
B. Steam and Gas
C. Gas and Electricity
D. Heating and Cooling
83: A Mohr's circle reduces to a point when the body is subjected to which of the following conditions?
A. Equal and opposite axial stress on two mutually perpendicular planes, the planes being free of shear
B. Pure shear
C. Equal axial stress on two mutually perpendicular planes, the planes being free of shear
D. Uniaxial stress only
84: Doubling the thickness of a rectangular cantilever beam will do what to the stiffness?
A. The beam becomes 8x stiffer.
B. The beam becomes 6x stiffer.
C. The beam becomes 4x stiffer.
D. The beam becomes 2x stiffer.
85: Water can be raised in temperature by means of what type of energy?
A. Sensible heat
B. Superheat
C. Latent heat
D. Thermodynamic energy
86: In relation to O-Ring sealing, what are back up seals.
A. A second O-Ring seal to provide redundancy against failure
B. O-Rings made with special tolerances
C. O-Rings made from HNBR material to prevent failure
D. Additional rings which help prevent O-Ring extrusion
87: What is the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure?
A. Compressibility factor
B. volume factor
C. ideal ratio
D. Boyle's ratio
88: Which thermodynamic cycle is ideally isobaric?
A. Boyle's cycle
B. Brayton cycle
C. Rankine cycle
89: For a completely isolated system, what is the entropy at thermodynamic equilibrium?
A. undefined
B. maximum
C. minimum
90: When dimensioning drawings with Inches which of these is the correct format?
A. 0.05±0.01
B. 0.05±.01
C. .05±0.01
D. .05±.01
91: What is the term for the horizontal portion of a chimney draft system extending from combustion equipment?
A. Breeching
B. Tailpipe
C. Flatpipe
D. Sideways run
92: What is the SI unit for thermal resistance?
A. Kelvins per ohm
B. Ohms
C. joules per Kelvin
D. Kelvins per Watt
93: What is the static head pressure of a column of water 2 ft high?
A. 2 psi
B. .433 psi
C. .866 psi
D. .216 psi
94: For a machine resting on four legs, how do you describe the leg not carrying equal weight to the other three?
A. The free leg
B. The light-weighted foot
C. The soft foot
D. The light leg
95: What type of loading is applied to a coil spring in compression?
A. Tension
B. Torsion
C. Bending
D. Compression
96: What is the function of unloaders in a reciprocating compressors design?
A. To prevent motor overload
B. To relieve excess pressure
C. To unload all cylinders
D. To decrease the compressor capacity
97: Which of these is NOT a type of truss?
A. Thomas truss
B. Pratt truss
C. Bowstring truss
D. King post
98: Which of these is a method for visualizing and analyzing fluid flow?
A. Particle image velocimetry
B. computational fluid dynamics
C. particle kinematics
99: What are the axes in Mohr's circle diagram?
A. X - axis : Normal Stress, Y - axis : Normal Strain
B. X - axis : Tensile Stress, Y - axis : Shear Stress
C. X - axis : Normal Stress, Y - axis : Shear Stress
D. X - axis : Stress, Y - axis : Strain
100: Which among the following is also known as croning process in which cast parts are produced with dimensional tolerances as low as ±0.2 millimeters.
A. Centrifugal casting
B. Investment casting
C. Slush casting
D. Shell casting
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