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.

ENGINEERING