Mixed Deck — All Plant Operator Selection System Test Topics Flashcards

A pattern sequence shows a shape rotating 90° clockwise each step. If step 1 is an arrow pointing right, what does step 3 show?

Answer: Arrow pointing left

Step 1 points right, step 2 points down (90° CW), and step 3 points left (another 90° CW).

A shape is reflected across a vertical axis. If the original shows a right-pointing arrow on the left side of a box, what does the reflection show?

Answer: Left-pointing arrow on the right side

Reflection across a vertical axis flips left-to-right and reverses horizontal direction, moving the arrow to the right side and pointing left.

If a 100 lb object is lifted using a block-and-tackle system with 4 rope segments supporting the load, approximately how much pull force is required (ignoring friction)?

Answer: 25 lb

The mechanical advantage equals the number of rope segments supporting the movable block, so 100 ÷ 4 = 25 lb.

A rectangular equipment pad measures 20 feet long (running east-west) and 8 feet wide (running north-south). An operator walks around the entire perimeter of the pad. What is the total distance walked?

Answer: 56 feet

The perimeter of a rectangle is calculated as 2 × (length + width) = 2 × (20 + 8) = 2 × 28 = 56 feet.

A pressure gauge reads 85 psi. If atmospheric pressure is 14.7 psi, what is the absolute pressure?

Answer: 99.7 psi

Absolute pressure = gauge pressure + atmospheric pressure = 85 + 14.7 = 99.7 psi.

A sequence shows: square with 1 dot inside → square with 2 dots inside → square with 3 dots inside. What comes next?

Answer: Square with 4 dots inside

The pattern adds one dot inside the square with each step, so the next figure has 4 dots.

A chart shows that Motor 3 consumes 18 kW at full load and 6 kW at no load. What percentage of full-load power is the no-load consumption?

Answer: 33%

6 kW ÷ 18 kW = 0.333 = 33.3%, so no-load is approximately 33% of full-load power.

Each figure in a row has one more side than the previous. The row starts with a triangle. What is the fourth figure?

Answer: Hexagon

Triangle (3) → square (4) → pentagon (5) → hexagon (6), so the fourth figure is a hexagon.

A level transmitter in a tank reads higher than the actual level. The most likely cause is:

Answer: A plugged or blocked impulse line on the low-pressure side

A blocked low-pressure impulse line traps pressure, reducing the differential and making the instrument report a falsely high level.

A rectangular containment basin is 50 meters long, 25 meters wide, and 4 meters deep. If it is 75% full, what is the volume of the liquid in the basin in cubic meters?

Answer: 3,750 cubic meters

First, calculate the total volume of the basin: Volume = length * width * depth = 50 m * 25 m * 4 m = 5,000 cubic meters. Next, calculate 75% of the total volume: 5,000 m³ * 0.75 = 3,750 cubic meters.

A pattern matrix rule: each figure in column 3 = column 1 figure with column 2 figure's shading removed (XOR). Column 1 row 2 = shaded square, column 2 row 2 = shaded square. What is column 3 row 2?

Answer: Unshaded square

When both column 1 and column 2 have shading (XOR: same inputs cancel), the result is an unshaded square.

A batch reactor requires 3 hours 45 minutes per cycle. How many complete cycles can be run in a 24-hour period?

Answer: 6 cycles

3 hr 45 min = 3.75 hr; 24 ÷ 3.75 = 6.4, so 6 complete cycles.

An operator faces north and makes a 90-degree turn to the right, then another 90-degree turn to the right. What direction is the operator now facing?

Answer: South

Facing north and turning 90 degrees right faces east; turning another 90 degrees right from east faces south.

Static electricity happens when?

Answer: Whenever the number of positive and the number of negative charges in a person's body is out of balance.

"Static electricity" (more properly "net electric charge" or "net electric charge") happens if the quantity of positive and negative electric charges is not exactly equal, according to the third statement in the third paragraph.

5 cubits equal? inches.

Answer: 9

18 inches make up one cubit, as you are aware. Multiply 18 by 0.5 to see how many inches are contained in 0.5 cubits. This equals nine. 18 inches are one cubit. 18 x 0.5 = 9 inches since 0.5 cubits equals? inches.

A sequence of shapes follows this rule: circle → square → triangle → circle → square → ? What comes next?

Answer: Triangle

The pattern repeats in a three-item cycle: circle, square, triangle, so after square comes triangle.

The first pair of figures has a specific relationship. Choose the figure that completes the second pair in the same way. Pair 1: [A large circle with the right half shaded black] is to [A large circle with the left half shaded black]. Pair 2: [A large square divided into four smaller squares, with the top-right and bottom-left quadrants shaded black] is to [?]

Answer: A large square divided into four smaller squares, with the top-left and bottom-right quadrants shaded black.

The relationship in the first pair is a horizontal reflection of the shading. The shading on the right side moves to the left side. Applying this same logic to the second pair, the shaded top-right quadrant moves to the top-left, and the shaded bottom-left quadrant moves to the bottom-right.

The IDLH (Immediately Dangerous to Life or Health) concentration for a gas is the level at which:

Answer: A worker could not escape without severe health effects

IDLH defines the concentration from which a worker could not escape within 30 minutes without irreversible harm or death.

Read the following passage from a troubleshooting manual and answer the question. "Symptom: Filter Press exhibits a slow filtration rate. Initial Actions: 1. Verify feed pump P-201 discharge pressure on gauge PG-101. The pressure must be within the normal operating range of 80-90 psig. Low pressure indicates a pump or suction line issue that must be resolved first. 2. If pressure is normal, check the differential pressure across the filter press. A reading above 25 psid indicates clogged filter media. 3. Only after confirming both normal feed pressure and high differential pressure should the operator initiate an automated backwash cycle." An operator observes a slow filtration rate and notes that the pressure on gauge PG-101 is 85 psig. What is the immediate next step according to the manual?

Answer: Check the differential pressure across the filter press.

The manual specifies a sequence of checks. Since the feed pump pressure of 85 psig is within the normal range (80-90 psig), the operator should proceed to the second step, which is to check the differential pressure.

A temperature drops from 212°F to 98.6°F. By how many degrees did it drop?

Answer: 113.4°F

212 − 98.6 = 113.4°F.