Q. In transportation planning, what does the term 'level of service' (LOS) indicate?
A.
The cost of road maintenance
B.
The quality of traffic flow
C.
The environmental impact of transportation
D.
The safety record of a highway
Solution
Level of service (LOS) is a qualitative measure that describes the operational conditions of a roadway, indicating the quality of traffic flow experienced by drivers.
Q. What does the term 'level of service' (LOS) refer to in traffic engineering?
A.
The quality of road surface
B.
The efficiency of traffic signals
C.
The operational conditions of a traffic stream
D.
The amount of traffic congestion
Solution
Level of service (LOS) is a qualitative measure that describes the operational conditions of a traffic stream, ranging from free flow to congested conditions.
Correct Answer:
C
— The operational conditions of a traffic stream
Q. What does the term 'level of service' (LOS) refer to in transportation planning?
A.
The quality of road surface
B.
The efficiency of traffic signals
C.
The operational conditions of a traffic stream
D.
The number of lanes on a highway
Solution
Level of service (LOS) refers to the operational conditions of a traffic stream, indicating how well a roadway or intersection performs under varying traffic conditions.
Correct Answer:
C
— The operational conditions of a traffic stream
Q. What does the term 'plasticity index' indicate in soil mechanics?
A.
The range of moisture content over which soil behaves plastically
B.
The soil's shear strength
C.
The soil's compaction characteristics
D.
The soil's permeability
Solution
The plasticity index indicates the range of moisture content over which soil behaves plastically, calculated as the difference between the liquid limit and plastic limit.
Correct Answer:
A
— The range of moisture content over which soil behaves plastically
Q. What is the bearing capacity of a square footing with a side length of 1.5 m on a soil with a cohesion of 40 kPa and a depth of 1 m?
A.
120 kPa
B.
160 kPa
C.
200 kPa
D.
240 kPa
Solution
The ultimate bearing capacity for a square footing can be calculated as q_u = c*N_c + q. For a depth of 1 m, N_c is approximately 5.0. Thus, q_u = 40 kPa * 5 = 200 kPa.
Q. What is the coefficient of consolidation (Cv) used for in settlement analysis?
A.
To determine the shear strength of soil
B.
To calculate the rate of consolidation
C.
To assess soil permeability
D.
To evaluate soil compaction
Solution
The coefficient of consolidation (Cv) is used to calculate the rate at which consolidation occurs in saturated soils, influencing the time it takes for settlement to occur.
Correct Answer:
B
— To calculate the rate of consolidation
Q. What is the deflection formula for a simply supported beam with a point load at the center?
A.
(P * L^3) / (48 * E * I)
B.
(P * L^3) / (3 * E * I)
C.
(P * L^3) / (12 * E * I)
D.
(P * L^2) / (2 * E * I)
Solution
The deflection (δ) at the center of a simply supported beam with a point load (P) at the center is given by δ = (P * L^3) / (48 * E * I), where E is the modulus of elasticity and I is the moment of inertia.
B.
The speed at which a road is designed to be safely traveled
C.
The average speed of traffic
D.
The speed of emergency vehicles
Solution
The design speed is the speed at which a road is designed to be safely traveled, taking into account various factors such as road geometry and traffic conditions.
Correct Answer:
B
— The speed at which a road is designed to be safely traveled