इन्जिनियरिङ काउन्सिल (NEC) – Engineering Council (NEC) MCQ
इन्जिनियरिङ काउन्सिल (NEC) – लाइसेन्स परीक्षा
Engineering Council (NEC) · Nepal Professional License Exams · ५९७ प्रश्न
५९७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ काउन्सिल (NEC): 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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In a rectangular channel, the loss of energy in a hydraulic jump with sequent depths y1 and y2 is:
सही उत्तर: घ) (y2 − y1)³ / (4 y1 y2)
Combining momentum and energy equations for a rectangular channel gives the head loss EL = (y2 − y1)³/(4 y1 y2).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When two identical centrifugal pumps are operated in parallel instead of one pump alone, the main effect is that:
सही उत्तर: क) The discharge is increased for the same head
In parallel the pumps work against the same head and their discharges add; series operation adds heads at the same discharge.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Priming of a centrifugal pump means:
सही उत्तर: ख) Filling the suction pipe, casing and impeller with the liquid before starting
A centrifugal pump cannot develop enough suction with air in the casing, so it must be filled with liquid (primed) before starting.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A draft tube is an essential part of which turbines?
सही उत्तर: ख) Reaction turbines such as Francis and Kaplan
In reaction turbines the draft tube allows the runner to be placed above tail water and recovers kinetic energy at exit; impulse turbines discharge to atmosphere.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The specific speed of a hydraulic turbine (N in rpm, power P, net head H) is given by:
सही उत्तर: ग) N√P / H^(5/4)
Turbine specific speed Ns = N√P/H^(5/4); the form N√Q/H^(3/4) is used for pumps.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In fully developed laminar flow through a circular pipe, the maximum velocity at the centre is how many times the mean velocity?
सही उत्तर: घ) 2
The velocity profile in Hagen-Poiseuille flow is parabolic, giving umax = 2 × mean velocity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The force exerted by a water jet of cross-sectional area A and velocity V striking normally on a stationary flat plate is:
सही उत्तर: क) ρAV²
Force = mass flow rate × change of velocity = (ρAV) × V = ρAV², since the jet's normal velocity is destroyed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The free surface of a liquid rotating with its container as a forced vortex takes the shape of a:
सही उत्तर: क) Paraboloid of revolution
In a forced vortex the rise of surface is z = ω²r²/(2g), which describes a paraboloid of revolution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The metacentric height GM of a floating body, with I the second moment of the waterline area about the axis of tilt, V the displaced volume and BG the distance between centres of buoyancy and gravity (G above B), is:
सही उत्तर: ख) I/V − BG
BM = I/V, and with G above B, GM = BM − BG = I/V − BG; the body is stable if GM is positive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of surface tension is:
सही उत्तर: ग) N/m
Surface tension is force per unit length (N/m), equivalently energy per unit area (J/m²); N·s/m² is the unit of dynamic viscosity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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