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Question 1
What defines a Radioactive Work Area (RWA)?
Correct Answer:
An area where radioactive work is performed and airborne activity >= 1 MPCa and any loose contamination
Explanation:
Radioactive Work Area is a space where radioactive work is being done and there is potential for radioactive material to become airborne and to contaminate surfaces. The key threshold is 1 MPCa, which means the airborne radioactivity in that area is at least the maximum permissible concentration for air. If the area has airborne activity at or above this level and there is any loose contamination on surfaces, it becomes an RWA so stricter controls, access restrictions, monitoring, and decontamination procedures apply. This setup protects workers from elevated inhalation doses and prevents the spread of contamination. Areas with no radioactive work, or areas that contain only sealed sources (which do not release contamination), do not meet the criteria for an RWA. An area used only for breaks is not involved in handling radioactive material and would not be designated as an RWA.
Question 2
What is a primary reason for requiring authorization before entering a radioactive area?
Correct Answer:
To ensure proper training and authorization from the crew leader and RPC supervision
Explanation:
In radiological work, access to a radioactive area is tightly controlled to protect people from exposure and contamination. Requiring authorization ensures the person entering has received the necessary training and is cleared to work there by the crew leader and the Radiation Protection staff. This check confirms you understand the hazards, know the required controls (time, distance, shielding, dosimetry, and PPE), and are ready to follow the documented procedures. It also means the entry is tied to a specific task with appropriate supervision, so the work stays within approved bounds and dose and contamination risks are managed. The other options don’t address safety or exposure control—they relate to activities like meetings, financials, or weather, which aren’t relevant to entering a radioactive area.
Question 3
In a balanced three-phase system, how is real power P related to apparent power S and power factor PF?
Correct Answer:
P = S × PF
Explanation:
In an AC system, real power is the portion of the apparent power that actually does useful work, while apparent power is the product of voltage and current regardless of phase. The power factor tells you how much of that apparent power is being converted to real work, and it is defined as PF = P / S. So the real power is P = S × PF. In a balanced three-phase setup, S = √3 V_L I_L and P = √3 V_L I_L cos φ with PF = cos φ, which leads to P = S cos φ = S × PF. This is the straightforward relationship that ties together real power, apparent power, and power SAMPLEfactor.
Question 4
What approval is required before entering a radioactive area?
Correct Answer:
Authorization from the radiography crew leader, and direct supervision of an RPC
Explanation:
Access to a radioactive area must be tightly controlled to protect workers from radiation exposure. The necessary entry approval combines both authorization and supervision. The radiography crew leader is the person who authorizes a worker to enter, confirming they have the proper training, qualifications, and assignment. The direct supervision by the RPC (Radiation Protection Coordinator) ensures ongoing safety oversight while inside the area, enforcing procedures, monitoring dosimetry, and ensuring that all controls—shielding, PPE, access logs, and work procedures—are correctly followed. Without either element, there’s a risk of entering without clearance or without immediate protection and guidance, increasing exposure risk.
Question 5
In a pipe of constant cross-sectional area, if the velocity of a liquid doubles, what happens to the volumetric flow rate?
Correct Answer:
It doubles.
Explanation:
Volumetric flow rate is the amount of liquid that passes a point per unit time, and it’s the product of cross-sectional area and velocity: Q = A × v. With a pipe of constant cross-section, the area A stays the same, so changing velocity directly scales Q. If the velocity doubles, you push the same amount of area twice as fast, so Q becomes twice its original value. The other scenarios would require different changes in velocity: staying the same would mean velocity doesn’t change Q, halving would halve Q, and increasing velocity fourfold would yield a fourfold increase in Q.
Question 1
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About this Exam

Prepare with the Ontario Power Generation (OPG) Orange 1 Practice Test practice quiz. This question bank includes 10 questions covering radioactive, area, radiation, power, and exposure. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Ontario Power Generation (OPG) Orange 1 Practice Test

This practice set contains 10 questions from the matching question bank and focuses on radioactive, area, radiation, power, and exposure. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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