Tail Briz



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Qualification Master
Subject ENGINEERING
Country Korea, Republic of
Gender Male
Tail Briz ENGINEERING   -   Chemical Engineering

According to the first law of thermodynamics, what is the mathematical expression for the change in internal energy of a system undergoing a process?

The first law of thermodynamics states that the change in internal energy (ΔU) of a system undergoing a process is equal to the heat transfer (Q) into the system plus the work done (W) on the system.
Tail Briz ENGINEERING   -   Chemical Engineering

Which type of control system utilizes feedback from the controlled variable to adjust the manipulated variable and maintain desired process conditions?

In a closed-loop control system, feedback from the controlled variable is continuously compared to the desired setpoint, and adjustments to the manipulated variable are made to maintain the desired process conditions.
Tail Briz ENGINEERING   -   Chemical Engineering

What is the driving force for mass transfer in a binary gas mixture undergoing diffusion?

In diffusion, the driving force for mass transfer is the concentration gradient of the species in the mixture, causing molecules to move from regions of high concentration to regions of low concentration.
Tail Briz ENGINEERING   -   Chemical Engineering

Which parameter is used to characterize the flow behaviour of a fluid in laminar and turbulent flow regimes?

The Reynolds number is a dimensionless parameter used to characterize the flow behavior of a fluid, distinguishing between laminar and turbulent flow regimes based on the fluid velocity, density, viscosity, and characteristic length.
Tail Briz ENGINEERING   -   Chemical Engineering

In a reversible exothermic reaction, what effect does increasing the temperature have on the equilibrium conversion?

According to Le Chatelier's principle, increasing the temperature of an exothermic reaction will shift the equilibrium towards the reactants, resulting in a decrease in the equilibrium conversion.
Tail Briz ENGINEERING   -   Mechanical Engineering

What is the main function of a Pelton wheel turbine in a hydropower plant?

A Pelton wheel turbine is designed to extract energy from high-pressure water jets and convert it into rotational mechanical energy, which is then used to drive an electrical generator in a hydropower plant.
Tail Briz ENGINEERING   -   Mechanical Engineering

Which mode of heat transfer predominates in a vacuum?

Radiation is the primary mode of heat transfer in a vacuum because it does not require a medium for energy transfer and can occur through electromagnetic waves.
Tail Briz ENGINEERING   -   Mechanical Engineering

What is the Reynolds number used to determine in fluid flow analysis?

The Reynolds number is a dimensionless parameter used in fluid mechanics to predict the flow regime (i.e., laminar, transitional, or turbulent) of a fluid flow based on its velocity, density, viscosity, and characteristic length.
Tail Briz ENGINEERING   -   Mechanical Engineering

In a static equilibrium system, what condition must be satisfied for the sum of all forces acting on a rigid body?

In a static equilibrium system, the sum of all forces acting on a rigid body must be zero to ensure that the body remains stationary.
Tail Briz ENGINEERING   -   Mechanical Engineering

Which of the following materials exhibits the highest strength-to-weight ratio at room temperature?

Carbon fiber reinforced polymer (CFRP) composites offer exceptional strength-to-weight ratios due to the high strength of carbon fibers combined with the low density of the polymer matrix.
Tail Briz ENGINEERING   -   Civil Engineering

What is the purpose of a hydrograph in hydrology?

A hydrograph is a graphical representation of river flow over time and is commonly used in hydrology to model flood routing and assess flood risk.
Tail Briz ENGINEERING   -   Civil Engineering

Which method of structural analysis is particularly suitable for analysing tall and slender structures subjected to lateral loads, such as skyscrapers?

The finite element method is well-suited for analyzing complex structures like skyscrapers under lateral loads due to its ability to model geometric and material nonlinearities.
Tail Briz ENGINEERING   -   Civil Engineering

What is the purpose of a detention basin in stormwater management?

Detention basins are designed to temporarily store excess stormwater runoff, reducing peak flow rates and preventing flooding downstream.
Tail Briz ENGINEERING   -   Civil Engineering

Which equation governs the flow of water through a porous medium, considering both Darcy's law and the continuity equation?

The Dupuit-Forchheimer equation combines Darcy's law and the continuity equation to describe the flow of water through porous media.
Tail Briz ENGINEERING   -   Civil Engineering

In the design of reinforced concrete beams, what is the purpose of providing shear reinforcement such as stirrups or links?

Shear reinforcement, such as stirrups or links, is provided in reinforced concrete beams to increase their shear capacity and prevent shear failure.
Tail Briz ENGINEERING   -   Civil Engineering

What is the recommended minimum pressure head required for a water distribution system to ensure adequate flow and pressure?

According to the AWWA standards, the minimum pressure head required for a water distribution system is approximately 20 m (66 ft) to ensure adequate flow and pressure for domestic and commercial uses.
Tail Briz ENGINEERING   -   Civil Engineering

A simply supported beam with a span of 8 m is subjected to a point load of 10 kN at midspan. What is the maximum bending moment in the beam?

The maximum bending moment in a simply supported beam occurs at midspan and is calculated as M = (w x L) / 4, where w is the point load and L is the span. In this case, M = (10 kN x 8 m) / 4 = 40 kNm.
Tail Briz ENGINEERING   -   Civil Engineering

What is the recommended minimum stopping sight distance (SSD) for a highway with a design speed of 60 km/h?

According to the AASHTO Green Book, the minimum SSD for a highway with a design speed of 60 km/h is approximately 100 m, considering a perception-reaction time of 2.5 seconds and a deceleration rate of 3.5 m/s^2.
Tail Briz ENGINEERING   -   Civil Engineering

A soil sample has a liquid limit of 40% and a plastic limit of 20%. What is its plasticity index?

The plasticity index (PI) is calculated as PI = LL - PL, where LL is the liquid limit and PL is the plastic limit. In this case, PI = 40 - 20 = 20.
Tail Briz ENGINEERING   -   Civil Engineering

What is the maximum allowable compressive strength of concrete for a reinforced concrete beam according to ACI 318-19?

According to ACI 318-19, the maximum allowable compressive strength of concrete for a reinforced concrete beam is 6,000 psi (41.4 MPa) to ensure ductility and prevent brittle failure.
Tail Briz ENGINEERING   -   Electrical Engineering

In a DC generator, what is the function of the commutator?

The commutator in a DC generator converts the alternating voltage induced in the armature winding into direct current by reversing the direction of current flow in each armature coil as it rotates.
Tail Briz ENGINEERING   -   Electrical Engineering

In a separately excited DC motor, if the field winding is open-circuited while the armature winding is connected to a DC supply, what will happen to the motor speed?

In a separately excited DC motor, the speed is primarily controlled by the armature voltage. Opening the field winding circuit does not affect the armature voltage, so the motor speed remains unchanged.
Tail Briz ENGINEERING   -   Electrical Engineering

What is the primary purpose of using transformers in the transmission and distribution of electrical power?

Transformers are used in transmission and distribution systems to step up voltage for long-distance transmission to reduce losses and then step down voltage for distribution to end-users.
Tail Briz ENGINEERING   -   Electrical Engineering

A transformer has a turns ratio of 1:10. If the primary winding has 500 turns, how many turns are there in the secondary winding?

The turns ratio of 1:10 means that for every turn in the primary winding, there are 10 turns in the secondary winding. Therefore, if the primary winding has 500 turns, the secondary winding will have 500 x 10 = 5000 turns.
Tail Briz ENGINEERING   -   Electrical Engineering

In a buck-boost converter circuit, if the duty cycle of the switch is increased, what effect does it have on the output voltage?

In a buck-boost converter, increasing the duty cycle of the switch decreases the output voltage since it increases the time during which the switch is off, reducing the average voltage across the load.