BT-204 Basic Civil Engineering & Mechanics - Jun 2024 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aGive an explanation of "workability of concrete" and discuss over the factors that affect it.
   How to answer

   • Define workability as ease of mixing, placing, compacting and finishing.
   • List factors: water content, aggregate, admixtures, temperature, time.
   • Explain effect of each factor.
   • Mention workability tests.
2. 7 Marks
   bExplain about any two-laboratory experiments that were done on concrete.
   How to answer

   • Name two laboratory tests on concrete.
   • Outline apparatus and procedure for each.
   • State observations and calculations.
   • State significance for quality control.
3. 7 Marks
   aGive a brief explanation of the various levelling operations (Profile, Cross-sectional, Differential, and Fly levelling) that are utilized in field surveys.
   How to answer

   • Define levelling in field surveys.
   • Explain Profile levelling.
   • Explain Cross-sectional, Differential and Fly levelling.
   • Give field applications.
4. 7 Marks
   bGive a brief explanation of remote sensing and how it is used in the construction field.
   How to answer

   • Define remote sensing and its principle.
   • Describe sensors and platforms.
   • Explain uses in construction field.
   • State advantages and limitations.
5. 7 Marks
   aUsing a clear sketch, describe the various stair case types utilized in the construction of structures.
   How to answer

   • List staircase types: straight, dog-legged, open-well, spiral etc.
   • Provide clear labelled sketches.
   • Describe construction features.
   • Mention suitability.
6. 7 Marks
   bIdentify the various kinds of stones that serve a purpose in the construction Industry.
   How to answer

   • Define building stones and classification.
   • List various kinds: granite, sandstone, limestone, marble etc.
   • State properties and uses in construction.
   • Identify suitable stones for different works.
7. 10 Marks
   aAn embankment of a width 10m and side slope of 1.5:1 is required to be made on a ground which is level in a direction transverse to the centreline. The centreline heights at 40 m intervals area as follows: 1.90, 2.25, 3.15, 1.50, 3.85, 2.35 and 1.85. Calculate the volume of earth work according to trapezoidal and prismoidal method.
   How to answer

   • Compute cross-sectional area from width, height and side slope.
   • List centre heights at 40 m intervals.
   • Apply trapezoidal formula for volume.
   • Apply prismoidal formula for volume.
8. 4 Marks
   bExplain the different terminology used in profile levelling.
   How to answer

   • Define profile levelling.
   • Explain terms: datum, reduced level, backsight, foresight etc.
   • Explain longitudinal section and cross-section.
   • Give example usage.
9. 8 Marks
   aThe following are the consecutive reading were taken with a level and a 4-meter levelling staff on a continuously sloping ground at a common interval of 30 m. 0.555(A), 2.545, 3.345, 4.125, 5.835, 0.755, 2.350, 3.455, 1.825, 4.485, 1.585, 2.415, 1.840, 3.765 and 3.855(B). The R.L. of the first reading at A was 490.500. Make entries in level book and apply the usual check. Determine the gradient of AB. The instrument is shifted after 4th and 10th reading.
   How to answer

   • Tabulate readings and identify backsight, intermediate, foresight.
   • Compute HI and RLs and apply arithmetic check.
   • Determine fall/rise and gradient of AB.
   • Note instrument shifts after 4th and 10th reading.
10. 6 Marks
    bExplain in brief about the difference between the line of collimation and Rise & Fall Method.
    How to answer

    • Define line of collimation method.
    • Define rise and fall method.
    • Compare procedure, checks and accuracy.
    • State suitability of each.
11. 6 Marks
    aDefine and prove the theorem of Lami's.
    How to answer

    • Define Lami's theorem for three concurrent forces.
    • Draw free body diagram of concurrent system.
    • Derive sine rule relation for equilibrium.
    • State conditions and limitations.
12. 8 Marks
    bSolve the problem using theorem the Block P = 5 kg and Block Q of mass "m" kg is suspended through the chord is in the equilibrium position as shown in figure. Determine the mass of Block Q.

    How to answer

    • Draw free body diagram at joint B with angles 30 deg and 70 deg.
    • Apply Lami's theorem at joint B.
    • Solve for tension in chord and weight of Q.
    • Compute mass m of Block Q.
13. 6 Marks
    aDifferentiate the difference between Moment of inertia of mass, Moment of inertia of Area and Product of inertia.
    How to answer

    • Define mass moment of inertia.
    • Define area moment of inertia.
    • Define product of inertia and units.
    • Differentiate physical meaning and applications.
14. 8 Marks
    bFind the moment of inertia of the below fig.

    How to answer

    • Divide composite into triangle, rectangle minus circle.
    • Compute centroidal distances and areas.
    • Apply parallel axis theorem about x-axis.
    • Sum to get total moment of inertia.
15. 14 Marks
    Explain about the following terms: a) Centroid and Centre of Gravity b) EDM measurement and conventional measurement c) Method of joints and Method of Section
    How to answer

    • Define centroid vs centre of gravity.
    • Explain EDM vs conventional measurement.
    • Explain method of joints vs method of sections.
    • Give applications in civil and mechanics.