सडक तथा यातायात इन्जिनियरिङ – Highway & Transportation MCQ
सडक तथा यातायात इन्जिनियरिङ – सिभिल इन्जिनियरिङ
Highway & Transportation · Civil Engineering · ४०३ प्रश्न
४०३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
सडक तथा यातायात 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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A clear zone that must be kept free of obstructions on the inner side of a horizontal curve to provide the required sight distance is defined by the:
सही उत्तर: क) Set-back distance
Set-back distance is measured from the centre line of the inner lane to the obstruction, so that the sight line remains unobstructed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 7.5 m wide pavement is superelevated to 0.07 by rotating about its inner edge, at a rate of 1 in 150. The length of superelevation runoff is about:
सही उत्तर: क) 78.8 m
Rise of outer edge = 7.5 × 0.07 = 0.525 m; length = 0.525 × 150 ≈ 78.8 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IRC, the maximum superelevation on hill roads not affected by snow is:
सही उत्तर: ग) 10%
IRC limits superelevation to 7% in plain/rolling terrain and snow-bound hill areas, and 10% on hill roads not bound by snow.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For V = 80 km/h and R = 250 m on a plain-terrain road, e = V²/(225R) gives 0.114. The superelevation to be provided and the friction then developed at full design speed are:
सही उत्तर: ग) 0.07, with f ≈ 0.13 (less than 0.15, so safe)
Since 0.114 exceeds the 7% limit, provide e = 0.07; then f = V²/(127R) − e = 0.2016 − 0.07 ≈ 0.13, which is below 0.15, so the design is safe.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A horizontal curve has radius 100 m, superelevation 0.07 and lateral friction 0.15. The maximum safe speed on it is about:
सही उत्तर: क) 53 km/h
V = √[127R(e + f)] = √(127 × 100 × 0.22) = √2794 ≈ 52.9 km/h.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IRC, superelevation on curves of hill roads should be introduced at a rate (longitudinal slope of the outer edge relative to the centre line) not steeper than:
सही उत्तर: घ) 1 in 60
IRC allows the superelevation to be attained at 1 in 150 in plain and rolling terrain and 1 in 60 in mountainous and steep terrain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a design speed of 80 km/h with maximum superelevation 0.07 and lateral friction 0.15, the ruling minimum radius of horizontal curve is about:
सही उत्तर: ग) 229 m
R = V²/[127(e + f)] = 80²/(127 × 0.22) = 6400/27.94 ≈ 229 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IRC, the minimum length of an overtaking zone should be:
सही उत्तर: ग) Three times the overtaking sight distance
Overtaking zones should be at least 3 × OSD long (desirably 5 × OSD) and marked with signs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In overtaking sight distance, the minimum spacing between vehicles is s = 0.7vb + 6 (vb in m/s). For an overtaken vehicle speed of 50 km/h, s is about:
सही उत्तर: क) 15.7 m
vb = 50/3.6 = 13.89 m/s; s = 0.7 × 13.89 + 6 ≈ 15.7 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For measuring stopping sight distance as per IRC, the driver's eye height and the object height are taken respectively as:
सही उत्तर: घ) 1.2 m and 0.15 m
SSD uses eye height 1.2 m and object 0.15 m; for overtaking sight distance both are taken as 1.2 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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