An aircraft is flying in level flight at a speed of 200 km/hr through air (density, p = 1.2 kg/m2, and viscosity m = 1.6x10-5 N-s/m2). The lift co-efficient at this speed is 0.4 and the drag co-efficient is 0.0065. The mass of the aircraft is 800 kg. The effective lift area of the aircraft is

1.  21.2 m2

2.  10.6 m2

3.  2.2 m2

4.  1.1 m2

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4
Correct Answer :

1.1 m2


Explanation :
No Explanation available for this question

A frictionless fluid of density r flow through a bent pipe as shown below. If A is the cross sectional area and V is the velocity of flow, the forces exerted on segment 1-2 of the pipe in the x and y directions are, respectively

1.  ρAV2;0

2.  rAV2;√2 ρAV2

3.  0;0

4.  0; (1/2) ρAV2

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4
Correct Answer :

0;0


Explanation :
No Explanation available for this question

Some of the structural strength of a clayey material that is lost by remoulding is slowly recovered with time.  This property of soils to undergo an isothermal gel-to sol-to-get transformation upon agitation and subsequent rest is termed 

1.  Isotropy

2.  Anisotropy

3.  Thixotropy

4.  Allotropy

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4
Correct Answer :

Thixotropy


Explanation :
No Explanation available for this question

If soil is dried beyond its shrinkage limit, it will show

1.  Large volume change

2.  Moderate volume change

3.  Low volume change

4.  No volume change

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4
Correct Answer :

No volume change


Explanation :
No Explanation available for this question

The stress-strain behaviour of soils as shown in the Figure correspondence to

1.  Curve 1 : Loose sand and normally consolidated clay Curve 2 : Loose sand and over consolidated clay

2.  Curve 1 : Dense sand and normally consolidated clay Curve 2 : Loose sand and over consolidated clay

3.  Curve 1 : Dense sand and over consolidated clay Curve 2 : Loose sand and normally consolidated clay

4.  Curve 1 : Loose sand and over consolidated clay Curve 2 : Dense sand normally consolidated clay

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4
Correct Answer :

Curve 1 : Dense sand and over consolidated clay

Curve 2 : Loose sand and normally consolidated clay


Explanation :
No Explanation available for this question

In cohesive soils he depth of tension crack (Zcr) is likely to be

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

The settlement of prototype in granular material may be estimated using plate load test data from the following expression

1.  Sprototype = Splate x (B prototype/Bplate)

2.  Sprototype = Splate x (B plate /B prototype)

3.  Sprototype = Splate x [2B prototype/ (B prototype + Bplate)]2

4.  Sprototype = Splate x [(B prototype + Bplate)/2B prototype]2

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4
Correct Answer :

Sprototype = Splate x (B prototype/Bplate)


Explanation :
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In which one of the following arrangement would the vertical force on the cylinder due to water be the Maximum

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be

1.  2.0

2.  1.63

3.  1.00

4.  0.61

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4
Correct Answer :

1.00


Explanation :
No Explanation available for this question

Three reservoirs A, B and C are interconnected by pipes as shown in the Figure. Water surface elevations in the reservoirs and the Pirzometric head at the junction J are indicated in the Figure. Discharge Q1, Q2 and Q3 are related as

1.  Q1+Q2 = Q3

2.  Q1= Q2+Q3

3.  Q2=Q1+Q3

4.  Q1+Q2+Q3 = 0

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4
Correct Answer :

Q1= Q2+Q3


Explanation :
No Explanation available for this question
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