Civil Engineering - Comprehensive Mock Test 5

Question 41 Medium

For a prestressed concrete bridge beam, a minimum clear spacing of the cable of group of cables should be

A) 50mm B) 25mm C) 25mm of 6mm plus the largest size of the aggregates D) 40mm

---

Solution Breakdown:

The grouping of cable is permissible but not more than two cables should touch each other in vertical plan and minimum spacing in vertical planes between such grouped cable should be 50mm

Question 42 Hard

The cable for a prestressed concrete simply supported beam subject to a uniformly distributed load over the entire span should ideally be

A) Parabolic with zero eccentricity at the ends and maximum eccentricity at the centre of span B) Placed at some eccentricity over the entire span C) Placed at the centre of cross section over entire span D) Varying linearly from the centre of cross section at the ends to the maximum eccentricity at the midsection

---

Solution Breakdown:

It should be ideal if it has parabolic profile with zero eccentricity at the ends and maximum eccentricity at the centre of the span.Due to this dead load is carried free of cost

Question 43 Hard

At the time of initial tensioning, the maximum tensile stress in tendon immediately behind the anchorage shall not exceed

A) 40% of the ultimate tensile strength of the wire or bar or strand B) 60% of the ultimate tensile strength of the wire or bar or strand C) 50% of the ultimate tensile strength of wire or bar or strand D) 80% of the ultimate tensile strength of wire or bar or strand

---

Solution Breakdown:

As per IS code 1343,the maximum tensile stress in tendon immediately behind the anchorage shall not exceed 80% of the ultimate tensile strength of wire or bar or strand

Question 44 Medium

In the design of two way slab restrained at all esges, torsional reinforcement required is

A) 0.375 times the area of steel provided at the midspan in the same direction B) 0.75 times the area of steel provided at the midspan in the same direction C) 0.375 times the area of steel provided in the shorter span D) Nil

---

Solution Breakdown:

As per IS code 456:1978 the torsional reinforcement required is 0.75 times that of the area of steel provided at the mid span in the same direction

Question 45 Medium

A reinforced concrete slab is 75mm thick. The maximum size of reinforcement bar that can be used is

A) 8 mm diameter B) 6 mm diameter C) 12 mm diameter D) 10 mm diameter

---

Solution Breakdown:

The diameter of reinforcing bar shall not exceed the one right of the total thickness of slab i.e 75/8=9.375, hence use 8mm dia bar

Question 46 Hard

The final deflection due to all load including the effect of temperature, creep and shrinkage measured from as cast level of supports of floors,roofs and all other horizontal members should not exceed

A) Span/350 B) Span/250 C) Span/200 D) Span/300

---

Solution Breakdown:

As per IS code 456:1978,the final deflection due to all loads including the effects of temperature,creep and shrinkage for all the horizontal members shouldnot exceed span/250

Question 47 Medium

The reduction coefficient of a reinforced concrete column with an effective length of 4.8m and size 250 mm x 300 mm is

A) 0.95 B) 0.8 C) 0.85 D) 0.9

---

Solution Breakdown:

From formula, reduction coefficient is equal to Cr,

Question 48 Hard

A 200mm thick brick masonry wall made of modular bricks carries an axial load of 30KN/m from wall above and an eccentric load of 20KN/m from RCC floor acting at a distance of 47.5mm from centre line of the wall. The resultant eccentricity ratio is

A) 0.09 B) 0.095 C) 0.1 D) 0.105

---

Solution Breakdown:

Thickness of wall=200mm ,e1=47.5mm

Question 49 Hard

A 200mm thick wall made of modular bricks is 5m long between cross walls and 3.8m clear height between RCC slabs at top and bottom. The slenderness ratio of the wall is

A) 15 B) 19 C) 20 D) 25

---

Solution Breakdown:

Slenderness ratio of wall = Height/thickness=(3.8*1000)/200=19

Question 50 Medium

In a tilted aerial photograph, if the swing is 230°, then the rotation angle is equal to

A) 140° B) 130° C) 50° D) 25°

---

Solution Breakdown:

While a specific detailed explanation is not available for this query, reviewing the core principles of Civil Engineering will help clarify the concept. This principle is vital for GATE, SSC JE, State Engineering Services, and PSU recruitment exams. Consistent practice is the key to mastering these patterns.