JKSSB JE Civil Mock Test - 7 - Civil Engineering (CE) MCQ

Shafts in parallel combination- driving torque is applied at the junction of the shafts. Angle of twist is same for both the shafts but the applied torque is divided.

Central Standards Office (CSO) and the Railway Testing and Research Centre (RTRC) were integrated into a single unit named Research Designs and Standards Organisation (RDSO) in 1957, under Ministry of Railways at Lucknow.

For most of the soils the value of specific gravity (G_s) lies between 2.65 to 2.8. Coarse grained soils have lower values. Soils having organic matter has very low values which may fall below 2. Soil rich in iron or mica show higher values.

The start or end of an activity is called an event. Lathe installed is example of an event as it shows completion of an activity.

Launching apron- stone cover placed on the bed of the river. It is an arrangement of packed stones which covers the base and side of the scour hole, preventing it from developing further.

Strain is a deformation caused by stress.

Continuity equation: Quantity of fluid per second is constant.
Q = VA
Quantity of fluid per second is constant and depends upon area and velocity of flow. Quantity of fluid per second increases as velocity of flow increases.

NAGPUR ROAD CONFERENCE -1943

• Nagpur development plan is the first road development plan that took place in Nagpur under the guidance of IRC.
• The duration of the road plan was 20 years (1943 to 1963)
• The target road density was 16km/100 km²
• Road were classified into 5 categories - National Highway (NH), State Highway (SH), Major District Road (MDR), Ordinary District Road (ODR) and Village Road (VR).
• The recommended road system was star and grid pattern.

Bitumen Penetration Test:

• Determines hardness or softness of bitumen
• Penetration value represents the grade of bitumen
• Penetration value is determined by measuring the depth in tenths of millimeter to which standard loaded needle will penetrate the sample vertically in 5 sec. The Bitumen sample is maintained at a temperature of 25^oC.

M40 grade has characteristic compressive strength (28-day, 150 mm cubes) of 40 N/mm².

Premix carpet (PC)- is a good, economical, bituminous wearing course mix to be placed on roads. It can be hot mix as well as cold mix. The premix carpet is also provided with a bituminous sand seal coat. Premix carpet is laid and compacted after a tack coat is applied on the clean surface.

Duty of water is a relationship between volume of water and area of crop it matures. It is number of hectares of land irrigated for maturity of a given crop by supply of 1 m³/sec of water continuously throughout the base period of the crop.

As per IS 456:2000, Cl. 23.1.2-
For continuous beams and frames, the distance between points of zero moments in the beam is assumed as 0.7 times effective span.

Desirable length of overtaking zone = 5 OSD
5 OSD = 950 or OSD = 950/5 =190 m
Minimum length of overtaking zone = 3 OSD
Minimum length of overtaking zone = 3 x 190 = 570 m

Discharge will be maximum when the depth of flow is critical for given specific energy.
Specific energy = (3/2) x critical depth of flow
Critical depth = depth of flow= (2/3) x specific energy= 2 x 4.5/3 = 2 x 1.5 = 3 m

Displacement = (l sin∅)/S
Given:
l = 5m
The scale: 5 m to 1 cm
∅ = 5^o,sin5^o = 0.087,S = 5
Displacement = (5 X 0.087)/5 = 0.087cm

Limitations of bar chart:
1) Only major activities are shown in bar chart.
2) A bar chart does not show progress of work. It cannot be used as a control device.
3) A bar chart does not show interdependencies of various activities.
4) When there are uncertainties in determination of estimated time required for completion of various activities, bar charts are not preferred.
Bar chart diagrams are preferred for small projects.

If BOD of a water sample is zero, it means that there is no organic matter present in the water because oxygen demand is zero. BOD of safe drinking water must be nil.

Contingencies- these are incidental expenses of miscellaneous nature which cannot be classified under any distinct item sub-head in the preparation of estimate. Certain amount of 3% to 5% of estimated cost is added to the total estimate to account for contingencies.

Slump test (IS:1199, Cl. 5)- maximum size of aggregate used is 38 mm.

Torsional equation:

I_P/R = polar modules of shaft section

As per IS 456:2000, Cl.26.5.3.2-
The pitch of lateral ties shall not be more than the least of the following distances

• The least lateral dimension the compression members
• 16 times the smallest diameter of the longitudinal reinforcement bar to be tied
• 300 mm

Individual wall method or long and short method of estimation-
Long wall length out to out = centre to centre length + one breadth
Short wall length in to in = centre to centre length - one breadth

Chezy's constant has the dimensions of [L^1/2T^-1]

R_A + R_C = 15 kN
R_C x 5 = 5 x 8 +5 x 2 = 50; R_C = 10 kN

kinetic energy per unit weight or kinetic head = v²/2g
v²/2g = 4.905
v = (2 x 9.81 x 4.905)^1/2
v = 9.81 m/s

Kharif crops: sown at the advent of the south-west monsoon season and are harvested at the end of monsoon season (October-November).
Ex: rice, maize, pulses, groundnuts
Rabi crops: are sown in winter and harvested in spring season in India.
Ex: wheat, barley, mustard, tobacco, potato

Momentum x velocity= mass x velocity² = [ML²T^-2]

Detonating signals - Detonating signals otherwise known as detonators or fog signals are appliances which are fixed on the rails, and when an Engine (or vehicle) passes over them, they explode with a loud report so as to attract the attention of the Driver.

Thermit welding is basically a fusion process, the required heat being evolved from a mixture of powdered aluminium and iron oxide.