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
Show solution
Solution
Average speed is calculated as total distance divided by total time: 100 m / 5 s = 20 m/s.
Correct Answer:
B
— 25 m/s
Learn More →
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
Show solution
Solution
Strain can be calculated using the formula: Strain = Stress / Young's Modulus. Thus, Strain = 100 MPa / 200 GPa = 0.0005.
Correct Answer:
A
— 0.0005
Learn More →
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
Show solution
Solution
The neutral axis in a beam subjected to bending is the axis where the bending stress is zero.
Correct Answer:
B
— The axis where bending stress is zero
Learn More →
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
Show solution
Solution
The area under the shear force diagram represents the bending moment at that section of the beam.
Correct Answer:
A
— Bending moment
Learn More →
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
Show solution
Solution
A positive bending moment indicates that the beam is sagging, meaning the top fibers are in compression and the bottom fibers are in tension.
Correct Answer:
A
— Beam is sagging
Learn More →
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
Show solution
Solution
The maximum shear force in a cantilever beam with a uniform distributed load occurs at the fixed support.
Correct Answer:
B
— At the fixed support
Learn More →
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
Show solution
Solution
The efficiency of a Carnot cycle is given by the formula η = 1 - (T_c/T_h), where T_c is the temperature of the cold reservoir and T_h is the temperature of the hot reservoir.
Correct Answer:
B
— The temperatures of the hot and cold reservoirs
Learn More →
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)
Show solution
Solution
The efficiency of a Carnot cycle is given by the formula η = 1 - (T_c/T_h), where T_c is the temperature of the cold reservoir and T_h is the temperature of the hot reservoir.
Correct Answer:
A
— 1 - (T_c/T_h)
Learn More →
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
Show solution
Solution
In a Carnot cycle, the hot reservoir must be at a higher temperature than the cold reservoir for the cycle to operate.
Correct Answer:
A
— T_hot > T_cold
Learn More →
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
Show solution
Solution
In a Carnot cycle, the isothermal process occurs during the heat absorption from the hot reservoir, where the temperature remains constant.
Correct Answer:
A
— Heat absorption from the hot reservoir
Learn More →
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
Show solution
Solution
In a closed system, if the internal energy increases, it means that heat must be added or work must be done on the system.
Correct Answer:
A
— Heat must be added or work must be done on the system
Learn More →
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
Show solution
Solution
Using F = ma, we have 20 N = 5 kg * a, thus a = 20 N / 5 kg = 4 m/s².
Correct Answer:
A
— 4 m/s²
Learn More →
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
Show solution
Solution
In a frictionless environment, all objects in free fall accelerate at 9.81 m/s² due to gravity.
Correct Answer:
B
— 9.81 m/s²
Learn More →
Q. In a Rankine cycle, what is the working fluid typically used?
A.
Air
B.
Water
C.
Refrigerant
D.
Helium
Show solution
Solution
The working fluid in a Rankine cycle is typically water, which is used to convert heat into work.
Correct Answer:
B
— Water
Learn More →
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
Show solution
Solution
For a simply supported beam with a point load P at the center, the maximum bending moment is given by M = PL/4.
Correct Answer:
B
— PL/2
Learn More →
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.
Show solution
Solution
If the sum of vertical and horizontal forces is zero, the system is in static equilibrium.
Correct Answer:
B
— The system is in static equilibrium.
Learn More →
Q. In a two-dimensional static equilibrium problem, how many equations are needed to solve for the unknowns?
Show solution
Solution
In a two-dimensional static equilibrium problem, two equations (sum of forces in x and y directions) are needed to solve for the unknowns.
Correct Answer:
B
— 2
Learn More →
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
Show solution
Solution
In an ideal gas, the internal energy increases with an increase in temperature.
Correct Answer:
C
— It increases
Learn More →
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
Show solution
Solution
CNC stands for Computer Numerical Control, which is a method used to control machine tools via a computer.
Correct Answer:
A
— Computer Numerical Control
Learn More →
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
Show solution
Solution
Conduction is the transfer of heat through direct contact between materials.
Correct Answer:
C
— Transfer of heat through direct contact
Learn More →
Q. In heat transfer, which mode does NOT require a medium?
A.
Conduction
B.
Convection
C.
Radiation
D.
All require a medium
Show solution
Solution
Radiation is the mode of heat transfer that does not require a medium; it can occur through a vacuum.
Correct Answer:
C
— Radiation
Learn More →
Q. In heat transfer, which mode involves the movement of fluid?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
Show solution
Solution
Convection is the mode of heat transfer that involves the movement of fluid, where heat is carried by the fluid as it moves.
Correct Answer:
B
— Convection
Learn More →
Q. In the Rankine cycle, what is the working fluid typically used?
A.
Air
B.
Water
C.
Refrigerant
D.
Helium
Show solution
Solution
The Rankine cycle typically uses water as the working fluid due to its favorable thermodynamic properties.
Correct Answer:
B
— Water
Learn More →
Q. In the Rankine cycle, what is the working fluid typically?
A.
Air
B.
Water
C.
Refrigerant
D.
Helium
Show solution
Solution
The Rankine cycle typically uses water as the working fluid, which undergoes phase changes to absorb and release heat.
Correct Answer:
B
— Water
Learn More →
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
Show solution
Solution
Green sand casting uses a mixture of sand and a binding agent to create the mold.
Correct Answer:
B
— Green sand casting
Learn More →
Q. In which forming process is a material deformed by compressive forces?
A.
Bending
B.
Drawing
C.
Forging
D.
Stamping
Show solution
Solution
Forging involves deforming a material by applying compressive forces.
Correct Answer:
C
— Forging
Learn More →
Q. In which process are materials typically joined using heat and pressure?
A.
Casting
B.
Welding
C.
Milling
D.
Additive Manufacturing
Show solution
Solution
Welding is a joining process that uses heat and pressure to fuse materials together.
Correct Answer:
B
— Welding
Learn More →
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
Show solution
Solution
MIG welding (Metal Inert Gas) involves feeding a continuous filler wire into the weld pool.
Correct Answer:
B
— MIG welding
Learn More →
Q. What does CNC stand for in manufacturing?
A.
Computer Numerical Control
B.
Computerized Network Control
C.
Controlled Numerical Computing
D.
Computerized Nonlinear Control
Show solution
Solution
CNC stands for Computer Numerical Control, which refers to the automated control of machining tools via computer.
Correct Answer:
A
— Computer Numerical Control
Learn More →
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
Show solution
Solution
The second law of thermodynamics states that the entropy of the universe tends to increase, indicating the direction of spontaneous processes.
Correct Answer:
C
— Entropy of the universe tends to increase
Learn More →
Showing 31 to 60 of 163 (6 Pages)