HAT Subject (Mechanical Engineering) FLP 3 Free Quiz

1. What are the characteristics of polymers?

A. Metals B. Ceramics C. Composites D. Polymers

2. What are the characteristics of ceramics?

A. Metals B. Ceramics C. Polymers D. Composites

3. What are the characteristics of cast iron?

A. Low carbon B. High ductility C. Good corrosion resistance D. High carbon, brittle

4. What are plastics?

A. Metals B. Ceramics C. Plastics D. Composites

5. What type of polymer hardens irreversibly when heated?

A. Thermoplastics B. Thermosets C. Elastomers D. Ceramics

6. What does the Rockwell test measure?

A. Tensile B. Hardness C. Impact D. Fatigue

7. What is the ultimate tensile strength?

A. Yield strength B. Fracture strength C. Ultimate tensile strength D. Fatigue strength

8. What branch of mechanics studies motion with forces?

A. Kinetics B. Kinematics C. Statics D. Dynamics

9. What is Newton's First Law?

A. F = ma B. Action-reaction C. Law of inertia D. Body at rest stays at rest

10. What is Newton's Second Law?

A. F = mv B. F = ma C. F = m/a D. F = m/v

11. What is a free body diagram?

A. Structural diagram B. Schematic C. Free body diagram D. Flowchart

12. What is the centroid?

A. Centroid B. Center of gravity C. Center of mass D. Center of pressure

13. What is a couple?

A. A single force B. Two perpendicular forces C. Two unequal forces D. Two equal and opposite parallel forces

14. What is friction?

A. Inertia B. Friction C. Momentum D. Energy

15. What type of friction acts during relative motion?

A. Static B. Rolling C. Kinetic D. Fluid

16. What is a column?

A. Beam B. Truss C. Column D. Arch

17. What is the moment of inertia?

A. Mass B. Area C. Volume D. Moment of inertia

18. What is the radius of gyration?

A. Moment of inertia B. Radius of gyration C. Centroid D. Center of gravity

19. What is energy?

A. Power B. Force C. Momentum D. Energy

20. What is potential energy?

A. Potential energy B. Kinetic energy C. Thermal energy D. Elastic energy

21. What does fluid mechanics study?

A. Liquids and gases in motion and at rest B. Liquids only C. Gases only D. Fluids in motion only

22. What is Newton's law of viscosity?

A. τ = μu B. τ = μ(du/dy) C. τ = μ/y D. τ = μu/y

23. What law states that pressure in a confined fluid is transmitted equally?

A. Bernoulli's principle B. Pascal's law C. Archimedes' principle D. Newton's law

24. What principle does a hydraulic lift work on?

A. Bernoulli B. Pascal C. Archimedes D. Newton

25. When is flow considered compressible?

A. Incompressible flow B. Subsonic flow C. Compressible flow D. Supersonic flow

26. In which flow regime do shock waves occur?

A. Subsonic B. Transonic C. Hypersonic D. Supersonic

27. The continuity equation is based on which conservation principle?

A. Energy conservation B. Mass conservation C. Momentum conservation D. Angular momentum conservation

28. What equation describes the motion of an inviscid fluid?

A. Euler equation B. Navier-Stokes equation C. Bernoulli equation D. Reynolds equation

29. What is heat transfer?

A. Movement of thermal energy B. Conduction only C. Convection only D. Radiation only

30. What is thermal conductivity?

A. Density B. Thermal conductivity C. Specific heat D. Thermal diffusivity

31. What is radiation?

A. Conduction B. Radiation C. Convection D. Advection

32. What is emissivity?

A. Absorptivity B. Reflectivity C. Transmissivity D. Emissivity

33. What is a heat exchanger?

A. Boiler B. Heat exchanger C. Condenser D. Evaporator

34. What does U represent in heat transfer?

A. Overall heat transfer coefficient B. Convective coefficient C. Thermal conductivity D. Thermal resistance

35. What is used to increase heat transfer by increasing surface area?

A. Heat pipe B. Fin C. Heat sink D. Radiator

36. What is an internal combustion engine?

A. Burns fuel inside cylinders B. Burns fuel outside C. Turbine engine D. Electric motor

37. How many strokes are in a four-stroke engine?

A. Three B. Four C. Five D. Six

38. What cycle is used in spark-ignition engines?

A. Diesel B. Rankine C. Brayton D. Otto

39. How does the compression ratio of a diesel engine compare to a gasoline engine?

A. Lower B. Equal C. Higher D. Variable

40. What does the cetane number indicate?

A. Cetane number B. Octane number C. Flash point D. Fire point

41. What uses exhaust gases to increase intake air pressure?

A. Supercharger B. Fuel injector C. Turbocharger D. Compressor

42. What cycle does a gas turbine power plant operate on?

A. Brayton B. Rankine C. Otto D. Diesel

43. What condenses steam into water?

A. Boiler B. Turbine C. Pump D. Condenser

44. What type of power plant uses water to generate electricity?

A. Hydroelectric B. Thermal C. Nuclear D. Solar

45. What converts wind energy into electricity?

A. Solar B. Hydro C. Wind D. Geothermal

46. What converts solar energy into electricity?

A. Wind B. Hydro C. Geothermal D. Solar

47. What is the thermal efficiency of a power plant?

A. Work/Heat B. Heat/Work C. Power/Heat D. Net work output / Heat input

48. What reduces the work of compression in a gas turbine?

A. Regeneration B. Reheat C. Intercooling D. Cogeneration

49. What increases the work output in a gas turbine?

A. Regeneration B. Intercooling C. Cogeneration D. Reheat

50. What is machining?

A. Forming B. Casting C. Machining D. Joining

51. What joining process fuses materials using heat?

A. Brazing B. Soldering C. Adhesive bonding D. Welding

52. What joining process uses a filler metal above 450°C?

A. Soldering B. Brazing C. Welding D. Adhesive bonding

53. What joining process uses a filler metal below 450°C?

A. Soldering B. Brazing C. Welding D. Adhesive bonding

54. What manufacturing process involves pressing and sintering metal powders?

A. Casting B. Forging C. Powder metallurgy D. Machining

55. What process is used for producing plastic parts?

A. Casting B. Forging C. Extrusion D. Injection molding

56. What process produces hollow plastic parts?

A. Injection molding B. Blow molding C. Compression molding D. Transfer molding

57. What processes are included in sheet metal forming?

A. Casting B. Forging C. Machining D. Sheet metal forming

58. What heat treatment process hardens metal by rapid cooling?

A. Annealing B. Quenching C. Tempering D. Normalizing

59. What manufacturing process builds parts layer by layer?

A. Subtractive B. Additive C. Formative D. Casting

60. What is CNC machining?

A. Computer-controlled B. Manual C. Hydraulic D. Pneumatic

61. What uses machines and control systems for production?

A. Manual B. Semi-automated C. Automated D. Manual

62. What is forced vibration?

A. Free vibration B. Damped vibration C. Undamped vibration D. Forced vibration

63. What manages the behavior of a dynamic system?

A. Sensor B. Actuator C. Controller D. Control system

64. What does the proportional controller do?

A. Integral B. Derivative C. Both D. Proportional

65. Which controller eliminates steady-state error?

A. Proportional B. Integral C. Derivative D. None

66. What is the transfer function?

A. Time ratio B. Frequency ratio C. Laplace ratio D. Gain

67. What is the characteristic equation?

A. Numerator zero B. Gain zero C. Input zero D. Denominator zero

68. What is an overdamped system?

A. Underdamped B. Overdamped C. Critically damped D. Undamped

69. What is a Nyquist plot?

A. Bode B. Root locus C. Nyquist D. Nichols

70. What are gain margin and phase margin?

A. Steady-state measures B. Transient measures C. Error measures D. Stability margin measures

71. What measures a physical quantity and converts it to a signal?

A. Actuator B. Controller C. Sensor D. Transducer

72. What transform is used in control systems for analysis?

A. Laplace B. Fourier C. Z-transform D. Hilbert

73. What is Young's modulus?

A. Shear modulus B. Young's modulus C. Bulk modulus D. Poisson's ratio

74. What is shear stress?

A. Normal stress B. Bending stress C. Shear stress D. Torsional stress

75. What is Poisson's ratio?

A. Modulus of rigidity B. Poisson's ratio C. Bulk modulus D. Elastic modulus

76. What is the flexural formula for bending stress?

A. τ = VQ/It B. σ = My/I C. τ = Tc/J D. σ = P/A

77. What is the yield strength?

A. Yield strength B. Ultimate strength C. Fracture strength D. Fatigue strength

78. What region of the stress-strain curve is reversible?

A. Plastic B. Elastic C. Rupture D. Necking

79. What is ductility?

A. Hardness B. Toughness C. Ductility D. Brittleness

80. What is brittleness?

A. Ductility B. Toughness C. Hardness D. Brittleness

81. What is toughness?

A. Hardness B. Toughness C. Ductility D. Brittleness

82. What is fatigue?

A. Creep B. Fracture C. Yield D. Fatigue

83. What is a mechanism?

A. Structure B. Machine C. Mechanism D. Frame

84. What is a link in a mechanism?

A. Joint B. Link C. Frame D. Mechanism

85. What is a kinematic pair?

A. Kinematic pair B. Link C. Mechanism D. Frame

86. What is the most common gear tooth profile?

A. Involute B. Cycloidal C. Straight D. Spiral

87. What type of bearing supports a rotating shaft with lubricant?

A. Ball bearing B. Roller bearing C. Thrust bearing D. Journal bearing

88. What type of bearing uses rolling elements?

A. Journal B. Ball C. Thrust D. Plain

89. What type of drive uses sprockets?

A. Belt B. Gear C. Chain D. Rope

90. What is a brake?

A. Brake B. Clutch C. Coupling D. Bearing

91. What type of brake uses a rotating disc and friction pads?

A. Drum B. Band C. Disc D. Shoe

92. What type of brake uses a rotating drum and friction shoes?

A. Disc B. Band C. Shoe D. Drum

93. What is thermodynamics?

A. Heat, work, and energy transformations B. Heat transfer only C. Fluid flow only D. Combustion only

94. What is entropy?

A. Enthalpy B. Internal energy C. Entropy D. Gibbs free energy

95. What is a Carnot engine?

A. Internal combustion B. Steam turbine C. Carnot engine D. Gas turbine

96. What transfers heat from cold to hot using work?

A. Refrigerator B. Heat pump C. Heat engine D. Generator

97. Which cycle is used in compression-ignition engines?

A. Diesel B. Otto C. Rankine D. Brayton

98. Which cycle is used in gas turbines?

A. Otto B. Diesel C. Brayton D. Rankine

99. What type of process is throttling?

A. Constant entropy B. Constant enthalpy C. Constant internal energy D. Constant temperature

100. What is a pure substance in thermodynamics?

A. Mixture B. Solution C. Compound D. Pure substance

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