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The North Eastern Electric Power Corporation Limited (NEEPCO) Engineer Previous Papers Civil Subject is as follows:


1. If A, B, C are square matrices of the same order, (ABC) -l is equal to
C -l A -1 B -1
C -l B -1 A -1
A -1 B -1 C -l
A -1 C -l B -1

2. The maximum number of linearly independent column vectors of a matrix A is called the rank of A.

II. If A is an N x N square matrix, it will be nonsingular if rank A = n. With reference to the above statements, which of the following applies?
(a) Both the statements are false.
(b) Both the statements are true.
(c) I is true, but II is false.
(d) I is false, but II is true.

3. The dimensions for the flexural rigidity of a beam element in mass (M), length (L) and time (T) is given by
(a) MT -2
(b) ML 3T -2
(c) ML -lT -2
(d) ML -l T 2*

4. Pick the incorrect statement from the following four statements:
(a) On the plane that carries maximum normal stress, the shear stress is zero.
(b) Principal planes are mutually orthogonal.
(c) On the plane that carries maximum shear stress, the normal stress is zero.
(d) The principal stress axes and principal strain axes coincide for an isotropic material.

5. The following two statements are made with reference to a simply supported under-reinforced RCC beam:

I. Failure takes place by the crushing of concrete before the steel has yielded.
II. The neutral axis moves up as the load is increased.
With reference to the above statements, which of the following applies?
(a) Both the statements are false. (c) I is true, but II is false.
(b) Both the statements are true. (d) I is false, but II is true.

6. A soil sample has a void ratio of 0.5, and its porosity will be close to
(a) 50%
(b) 66%
(c) 100%
(d) 33%

7. A borrow pit soil has a dry density of 17 kN/m 3. How many cubic meters of this soil will be required to construct an embankment of 100 m 3 volume with a dry density of 16 kN/m 3.
(a) 94 m 3
(b) 106 m 3
(c) 100 m 3
(d) 90 m 3

8. The group efficiency of a pile group
(a) will be always less than 100%.
(b) will be always greater than 100%
(c) may be less than 100% or more than 100%.
(d) will be more than 100% for pile groups in cohesionless soils and less than 100% for those in cohesive soils.

9. The two criteria for the determination of the allowable bearing capacity of a foundation are
(a) tensile failure and compression failure.
(b) tensile failure and settlement.
(c) bond failure and shear failure.
(d) shear failure and settlement.

10. If duty (D) is 1428 hectares/cumec and base period (B) is 120 days for an irrigated crop, then delta ( D ) in meters is given by
(a) 102.8 (b) 0.73

(c) 1.38 (d) 0.01

11. Cavitation is caused by
(a) high velocity
(b) low pressure
(c) high pressure
(d) high temperature

12. If the pump head is 15m, discharge is 0.464 m 3/s, and the motor speed is 1440 rpm at rated condition, the specific speed of the pump is about
(a) 4
(b) 26
(c) 38
(d) 1440

13. The BOD removal efficiency, in percentage, during primary treatment, under normal conditions is about
(a) 65%
(b) 85%
(c) 30%
(d) Zero

14. Critical factors for the activated sludge treatment process are
(a) maximum hourly flow rate.
(b) maximum and minimum flow rate.
(c) the maximum hourly flow rate and maximum daily organic load.
(d) the minimum hourly flow rate and minimum daily organic load.

15. Use of coagulants such as alum
(a) results in the reduction of pH of the treated water.
(b) results in the increase of pH of the treated water.
(c) results in no change in pH of the treated water.
(d) may cause an increase or decrease of pH of the treated water.

16. The disinfection efficiency of chlorine in water treatment
(a) is not dependent on pH value.
(b) is increase by increased pH value.
(c) remains constant at all pH values.
(d) is reduced by increased pH value.

17. The standard plate size in a plate bearing test for finding modulus of subgrade reaction (k) value is
(a) 100 cm diameter
(b) 50 cm diameter
(c) 75 cm diameter
(d) 25 cm diameter

18. Width of carriageway for a single lane is recommended to be
(a) 7.5 m
(b) 7.0 m
(c) 3.75 m
(d) 5.5 m

19. Stopping sight distance is the minimum distance available on a highway that is the
(a) distance of sufficient length to stop the vehicle without collision.
(b) distance visible to a driver during night driving.
(c) the height of the object above the road surface.
(d) a distance equal to the height of the drivers eye above the road surface.

20. Bituminous materials are commonly used in highway construction because of their good
(a) tensile and compression properties.
(b) binding and waterproofing properties.
(c) shear strength and tensile properties.
(d) bond and tensile properties.

21. A deep cut of 1m has to be made in clay with unit weight 16 kN/m 3 and a cohesion of 25 kN/m 2. What will be the factor of safety if one has to have a slope angle of 30? Stability number is given to be 0.178 (from Taylors chart) for a depth factor of 3.
(a) 0.80
(c) 1.25
(b) 1.1
(d) 1.0

22. In a drained triaxial compression test, a saturated specimen of a cohesionless sand fails under a deviatoric stress of 3 kgf/cm 2 when the cell pressure is 1 kgf/cm 2. The effective angle of shearing resistance of sand is about
(a) 37
(b) 45
(c) 53
(d) 20

23.Two footings, one circular and the other square, are founded on the surface of a purely cohesionless soil. The diameter of the circular footing is same as that of the side of the square footing. The ratio of their ultimate bearing capacities is

(a) 3/4
(b) 4/3

(c) 1.0
(d) 1.3

24. To have zero active pressure intensity at the tip of a wall in cohesive soil, one should apply a uniform surcharge intensity of

(a) 2 c tan a
(b) 2 c cot a
(c) 2 c tan a
(d) 2 c tan a

25. Water flows at a depth of 0.1m with a velocity of 6 m/s in a rectangular channel. The alternate depth is

0.30 m
0.40 m
0.86 m
0.81 m

26. In an area of 200 hectares, the water table drops by 4 m. If the porosity is 0.35 and the specific retention is 0.15, change in volume of storage in the aquifer is.

(a) 160 m 3
(b) 1.6 x 106 m
(c) 8 x 106 m 3
(d) 1.6 x 103 m 3

27. A tube well having a capacity of 4 m 3/hour operates for 20 hours each day during the irrigation season. How much area can be commanded if the irrigation interval is 20 days and depth of irrigation is 7 cm?

(a) 1.71 x 10 4 m 2
(b) 1.14 x 10 4 m 2
(c) 22.9 x 10 4 m 2
(d) 2.29 x 10 4 m 2

28. The parameters in Hortons infiltration equation [f(t) = f c + (f o f c ) e -kt] are given as, f o = 7.62 cm/hour, f c = 1.34 cm/hour and k = 4.182/hour.
For assumed continuous ponding the cumulative infiltration at the end of 2 hours is

(a) 2.68 cm
(b) 1.50 cm
(c) 1.34 cm
(d) 4.18 cm

29. Water flows at a rate of 10 m 3/s in a rectangular channel 3 m wide. The critical depth of flow is
1.13 m
2m
1.45 m
1.04 m

30. A circular sewer 2m diameter has to carry a discharge of 2 m 3/s when flowing nearly full. What is the minimum required slope to initiate the flow? Assume Mannings n = 0.015.
(a) 0.00023
(b) 0.000036
(c) 0.000091
(d) 0.000014

31. The following characteristics pertain to the sand filters used in the water industry.

Filtration rate is 1 to 4 m 3/(m 2 day).
The typical duration of operation in one run is 24 to 72 hours.
Operating cost is low.

Which of the above characteristics pertain to slow sand filters?(a) I, II and III

(a) I, II and III

(b) I and II

(c) II and III

(d) I and III

32. The ruling minimum radius of horizontal curve of a national highway in plain terrain for a ruling design speed of 100 km/hour with e = 0.07 and f = 0.15 is close to
(a) 250 m
(b) 360 m
(c) 36 m
(d) 300 m

33. Design rate of super elevation for horizontal highway curve of radius 450 m for a mixed traffic condition, having a speed of 125 km/hour is

(a) 1.0
(b) 0.05
(c) 0.07
(d) 0.1.54