Quiz: Civil Engineering
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes
Q1. The addition of CaCl_2 in concrete results in
(i) Increased shrinking
(ii) Decreased setting time
(iii) Decreased shrinkage
(iv) Increased setting time
(a) only (i) and (iv)
(b) only (iv)
(c) only (i)
(d) only (i) and (ii)
Q2. The maximum safe permissible limit of sulphates in domestic water supply is
(a) 200 mg/l
(b) 600 mg/l
(c) 100 mg/l
(d) 500 mg/l
Q3. Base period of a crop is the time between
(a) The instant of sowing to its harvesting
(b) First watering at the time of sowing to its last watering before harvesting
(c) Sowing to last watering
(d) First watering at the time of sowing to the time of harvesting
Q4. Calculate the length (m.) of the longer chord of 260 m radius curve having deflection angle of 90 degree.
(a) 353.6 m
(b) 392.7 m
(c) 367.7 m
(d) 500 m
Q5. What will be the shift of transition curve, if the length of transition curve is 80 m. and radius of the curve is 320 m?
Q6. Minimum pitch of the rivets shall not be less than:
Sol. Calcium chloride is used as accelerators. it decreases the setting time of concrete and Increase shrinkage of concrete.
Sol. The maximum safe-limits in domestic water supply are:
Chloride ≤ 250 mg/l
Nitrates ≤ 45 mg/l
Sulphates ≤ 200 mg/l
Fluorides ≤ 1.5 mg/l
Sol. The base period of a crop is the time between first watering at the time of sowing to its last watering before harvesting.
Sol. Given, Radius of curve (R) = 260 m.
Deflection angle (∆) = 90°
Length of Long chord is given by–
T₁DT₂ = 2R sin ∆/2
= 2 × 260 × sin 90/2
▭(T_1 DT_2=367.7 m)
Length of transition curve (L_s) = 80 m
Radius of the curve (R) = 320 m
Shift(s) = (L_s^2)/24R
= 0.83 m
Sol. The minimum pitch of rivets should be 2.5 times the nominal diameter or rivet i.e., 2.5d.
d = nominal diameter of rivet.