Quiz: Civil Engineering
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes
Q1. If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then
(a) Cd = Cc . Cv
(a) Cr = 1 + Cv2/Cd
(c) Cv = Cc + Cd
(d) Cc = Cv/Cd
Q2. The critical depth of flow in a most economical triangular channel section for a discharge of 1 m³/sec is given by
Q3. If the velocity, bulk modulus of elasticity and the mass density of a fluid are denoted by U, K and ρ respectively, then the Mach number is given by
Q4. Poise is the unit of:
(a) Mass density
(a) Kinetic viscosity
(c) Dynamic viscosity
(d) Velocity gradient
Q5. Which one of the following methods is used for the approximate estimation?
(a) Both central line and short wall and long wall method
(b) Central line method
(c) Plinth area method
(d) Short wall and long wall method
Q6. Accuracy in the measurement of the thickness of the slab or sectional dimension of column and beam (in centimetre) should be
Sol. coefficient of discharge is defined as the ratio of the actual discharge from an orifice to the theoretical discharge from the orifice. It is denoted by C_d.
C_d=(Actual discharge)/(Theoritical discharge)
=(Actual velocity)/(Theoritical velocity)×(Actual area)/(Theoritical Area)
C_V= coefficient of velocity
C_C= coefficient of contraction.
Sol. for most economical triangular channel section, the side slope m = tanθ = tan 45
Given, Q = 1 m³/sec.
Now, critical depth for triangular channel
Sol. Mach Number = √((Intertia force)/(Elastic force))
Sol. The unit of dynamic viscosity is (N-sec)/m^2 or poise.
1 (N-sec.)/m^2 = 10 Poise.
Sol. The approximate estimate is prepared from the practical knowledge and cost of similar projects. There are some methods for the approximation estimate.
Plinth area method
Unit base method
Cubical contents method
Sol. The accuracy in the measurement of the thickness of the slab or sectional dimension of column and beam should be 0.5 cm.
Wood work = 2 mm
Steel work = 1 mm
Volume = 0.01 m³
Area = 0.01 m²