Question 1

A resistor is used in a current loop system to convert the current signal to a voltage signal that can be measured by an indicator or a controller. The value of the resistor determines the voltage range that corresponds to the current range. For example, in a 4 to 20 mA system with a 250 ohm resistor, the voltage range is 1 to 5 V, because V = IR, where V is the voltage, I is the current, and R is the resistance. What is the value of resistance?

Options :

A : 50 ohms

B : 100 ohms

C : 125 ohms

D : 150 ohms

Answer: A

Question 2

Which of the following places the steps of the procedure model in the correct order?

Options :

A : Procedure, unit procedure, operation, phase, action, transition.

B : Procedure, operation, unit procedure, phase, transition, action.

C : Procedure, unit procedure, operation, transition, phase, action.

D : Procedure, unit procedure, operation, phase, transition, action.

Answer: A

Question 3

Which of the following information is included in the physical layer of the ISO/OSI seven-layer stack?

Options :

A : The layout of pins, voltages, and other physical requirements.

B : The transmission and reception of unstructured raw data over a physical medium.

C : The electrical signals that are used to encode the data over the wire.

D : All of the above.

Answer: A

Question 4

A contractor purchases and installs a manual motor protector in accordance with the manufacturer’s installation instructions and the applicable National Electric Code (NEC) installation code. What is the main advantage of using a manual motor protector over a conventional circuit breaker or fuse?

Options :

A : manual motor protector provides both overload and short-circuit protection in a single device, eliminating the need for additional components and wiring.

B : A manual motor protector provides a faster and more reliable response to short-circuit conditions, switching off the motor within milliseconds to prevent damage.

C : A manual motor protector provides a more accurate and adjustable current setting range, allowing for better motor control and performance.

D : All of the above.

Answer: A

Question 5

What are some of the systems that are typically included in the scope of building automation?

Options :

A : HVAC (heating, ventilation and air conditioning), electrical, lighting, shading, access control, security systems

B : HVAC (heating, ventilation and air conditioning), plumbing, fire protection, elevators, escalators, parking systems

C : HVAC (heating, ventilation and air conditioning), audiovisual, communication, network, data center, backup power systems

D : All of the above

Answer: A