Mechanical Engineering

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Q. If a car travels 100 meters in 5 seconds, what is its average speed?
  • A. 20 m/s
  • B. 25 m/s
  • C. 15 m/s
  • D. 30 m/s
Q. If a material has a Young's modulus of 200 GPa and is subjected to a tensile stress of 100 MPa, what is the strain?
  • A. 0.0005
  • B. 0.005
  • C. 0.05
  • D. 0.5
Q. In a beam subjected to bending, what does the neutral axis represent?
  • A. The axis where shear stress is maximum
  • B. The axis where bending stress is zero
  • C. The axis where axial stress is maximum
  • D. The axis where deflection is maximum
Q. In a beam, what does the area under the shear force diagram represent?
  • A. Bending moment
  • B. Deflection
  • C. Shear stress
  • D. Axial load
Q. In a bending moment diagram, what does a positive bending moment indicate?
  • A. Beam is sagging
  • B. Beam is hogging
  • C. Beam is in tension
  • D. Beam is in compression
Q. In a cantilever beam with a uniform distributed load, where does the maximum shear force occur?
  • A. At the free end
  • B. At the fixed support
  • C. At the midpoint
  • D. Uniformly distributed along the length
Q. In a Carnot cycle, what is the efficiency dependent on?
  • A. The work done by the system
  • B. The temperatures of the hot and cold reservoirs
  • C. The type of working fluid
  • D. The pressure of the system
Q. In a Carnot cycle, what is the efficiency formula?
  • A. 1 - (T_c/T_h)
  • B. T_h/T_c
  • C. T_c/T_h
  • D. 1 + (T_c/T_h)
Q. In a Carnot cycle, what is the relationship between the temperatures of the hot and cold reservoirs?
  • A. T_hot > T_cold
  • B. T_hot = T_cold
  • C. T_hot < T_cold
  • D. T_hot + T_cold = constant
Q. In a Carnot cycle, which process is isothermal?
  • A. Heat absorption from the hot reservoir
  • B. Heat rejection to the cold reservoir
  • C. Adiabatic expansion
  • D. Adiabatic compression
Q. In a closed system, if the internal energy increases, what must happen to the heat and work?
  • A. Heat must be added or work must be done on the system
  • B. Heat must be removed or work must be done by the system
  • C. Both heat and work must be removed
  • D. Neither heat nor work affects internal energy
Q. In a frictionless environment, if a 5 kg block is pushed with a force of 20 N, what will be its acceleration?
  • A. 4 m/s²
  • B. 2 m/s²
  • C. 5 m/s²
  • D. 0 m/s²
Q. In a frictionless environment, what is the acceleration of an object in free fall?
  • A. 0 m/s²
  • B. 9.81 m/s²
  • C. Depends on mass
  • D. Depends on shape
Q. In a Rankine cycle, what is the working fluid typically used?
  • A. Air
  • B. Water
  • C. Refrigerant
  • D. Helium
Q. In a simply supported beam, what is the maximum bending moment at the center when a point load is applied at the center?
  • A. PL/4
  • B. PL/2
  • C. PL
  • D. 0
Q. In a static system, if the sum of vertical forces is zero and the sum of horizontal forces is also zero, what can be concluded?
  • A. The system is in dynamic equilibrium.
  • B. The system is in static equilibrium.
  • C. The system is unstable.
  • D. The system is in motion.
Q. In a two-dimensional static equilibrium problem, how many equations are needed to solve for the unknowns?
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. In an ideal gas, what happens to the internal energy when the temperature increases?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It becomes zero
Q. In CNC machining, what does CNC stand for?
  • A. Computer Numerical Control
  • B. Computerized Network Control
  • C. Controlled Numerical Calculation
  • D. Computerized Numerical Command
Q. In heat transfer, what is conduction?
  • A. Transfer of heat through fluid motion
  • B. Transfer of heat through electromagnetic waves
  • C. Transfer of heat through direct contact
  • D. Transfer of heat through phase change
Q. In heat transfer, which mode does NOT require a medium?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. All require a medium
Q. In heat transfer, which mode involves the movement of fluid?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. Insulation
Q. In the Rankine cycle, what is the working fluid typically used?
  • A. Air
  • B. Water
  • C. Refrigerant
  • D. Helium
Q. In the Rankine cycle, what is the working fluid typically?
  • A. Air
  • B. Water
  • C. Refrigerant
  • D. Helium
Q. In which casting process is the mold made from a mixture of sand and a binding agent?
  • A. Shell molding
  • B. Green sand casting
  • C. Lost foam casting
  • D. Centrifugal casting
Q. In which forming process is a material deformed by compressive forces?
  • A. Bending
  • B. Drawing
  • C. Forging
  • D. Stamping
Q. In which process are materials typically joined using heat and pressure?
  • A. Casting
  • B. Welding
  • C. Milling
  • D. Additive Manufacturing
Q. In which welding process is a filler material fed into the weld pool?
  • A. TIG welding
  • B. MIG welding
  • C. Oxy-fuel welding
  • D. Spot welding
Q. What does CNC stand for in manufacturing?
  • A. Computer Numerical Control
  • B. Computerized Network Control
  • C. Controlled Numerical Computing
  • D. Computerized Nonlinear Control
Q. What does the second law of thermodynamics state?
  • A. Energy is conserved
  • B. Heat cannot flow from cold to hot spontaneously
  • C. Entropy of the universe tends to increase
  • D. All processes are reversible
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