Question

Class -A USWB pan has the following specifications:
A. It has metallic sheet of 22 gauge.
B. It has a diameter of 1.2 m.
C. It is painted as green.
D. It has a depth of 25 cm.
E. It is directly placed on the ground surface.
Choose the correct answer from the options given below:

• A. A, C, D and E only
• B. B and D only
• C. A, B and D only
• D. B, C, D and E only

Hint:

For the Class A pan, remember these key features: \(\sim\)1.2 m diameter, 25 cm depth, 22-gauge galvanized iron, UNPAINTED, and placed ON a wooden platform above the ground.

Answer 1

The Correct Option is C

Step 1: Recall the standard specifications of a U.S. Weather Bureau (USWB) Class A Evaporation Pan.
- Statement A: The pan is constructed from unpainted galvanized iron of 22-gauge thickness. This statement is correct.
- Statement B: The pan has a standard diameter of 47.5 inches, which is 120.7 cm or approximately 1.2 m. This statement is correct.
- Statement C: The pan is unpainted on the inside to provide a standard galvanized surface. It is not painted green. This statement is false.
- Statement D: The pan has a standard depth of 10 inches, which is 25.4 cm or approximately 25 cm. This statement is correct.
- Statement E: The pan is not placed directly on the ground. It must be mounted on a wooden open-frame platform, approximately 15 cm above the ground, to allow for air circulation underneath. This statement is false.
Step 2: Conclude the correct combination.
The correct specifications are A, B, and D.