सिभिल इन्जिनियरिङ
सिभिल इन्जिनियरिङ
Civil Engineering · ५,१७१ प्रश्न
५,१७१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
सिभिल इन्जिनियरिङ: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Water flows over a rectangular sharp-crested weir 1 m long under a head of 0.3 m. With Cd = 0.62 and Q = (2/3)Cd·b·√(2g)·H^1.5, the discharge is about:
सही उत्तर: घ) 0.30 m³/s
Q = (2/3) × 0.62 × 1 × √(19.62) × 0.3^1.5 = 0.413 × 4.429 × 0.164 ≈ 0.30 m³/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The impulse-momentum equation in fluid mechanics is used mainly to find:
सही उत्तर: ग) Forces exerted by flowing fluid on bends, nozzles and vanes
The momentum equation relates the net force to the rate of change of momentum, giving forces on pipe bends, nozzles and vanes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coefficient of discharge of a well-made venturimeter is usually about:
सही उत्तर: ग) 0.95 to 0.99
Gradual contraction and diffuser give very small losses, so Cd of a venturimeter is high (about 0.98), much higher than an orifice meter (about 0.6).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Pitot tube in a water stream shows a dynamic head (stagnation minus static) of 0.2 m. Neglecting losses, the velocity of flow is about:
सही उत्तर: क) 1.98 m/s
V = √(2gh) = √(2 × 9.81 × 0.2) ≈ 1.98 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Flow in which the velocity at a point does not change with time is called:
सही उत्तर: क) Steady flow
Steady flow has ∂V/∂t = 0 at every point; uniform flow means velocity does not change with distance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In steady flow, streamlines, path lines and streak lines:
सही उत्तर: घ) Are identical
In steady flow the velocity field does not change with time, so all three lines coincide.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The line traced by a single fluid particle over a period of time is called a:
सही उत्तर: क) Path line
A path line follows one particle; a streak line joins particles that passed through a fixed point; a streamline is tangent to velocity at an instant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water flows from a 300 mm pipe at 2 m/s into a 150 mm pipe. The velocity in the smaller pipe is:
सही उत्तर: घ) 8 m/s
A1V1 = A2V2 ⇒ V2 = V1(D1/D2)² = 2 × (300/150)² = 8 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fully submerged body is in stable equilibrium when its:
सही उत्तर: घ) Centre of buoyancy lies above its centre of gravity
For a submerged body the centre of buoyancy is fixed relative to the body, so stability needs B above G.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body of volume 0.5 m³ is fully submerged in water (ρ = 1000 kg/m³, g = 9.81 m/s²). The buoyant force on it is about:
सही उत्तर: ग) 4.91 kN
By Archimedes' principle, FB = ρgV = 1000 × 9.81 × 0.5 = 4905 N ≈ 4.91 kN.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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