D62 MASTER THE DAY

D62 MASTER THE DAY

Professional Development

111 Qs

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D62 MASTER THE DAY

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Assessment

Quiz

Professional Development

Professional Development

Practice Problem

Hard

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WINCENTRE CLASSES

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111 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which instrument used in sewer testing forms bubbles at leaky joints?

Lead acetate paper
Boning rod
Soap solution
Blower

Answer explanation

Soap solution applied to joints reveals bubbles at leakage points during air test.

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which gas is tested in sewers using a lighted lantern to confirm safe entry?

Methane
Carbon dioxide
Oxygen
Hydrogen sulfide

Answer explanation

Oxygen presence is confirmed by a lighted lantern burning brightly in the sewer.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which method is used to set out the centerline of sewer trenches?

Offset line method
Diagonal method
Compass method
Radiation method

Answer explanation

Offset line method marks the centerline parallel to trench, ensuring accurate layout.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the role of boning rods during sewer trenching?

Detect gas
Check level
Lift pipes
Backfill trenches

Answer explanation

Boning rods are used with sight rails to ensure level and gradient during trenching.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which test uses a lamp and mirror to check pipe alignment?

Water test
Smoke test
Mirror test
Ball test

Answer explanation

Mirror test detects straightness using light reflection across pipe length.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

During air testing, what pressure drop indicates leakage?

5 mm
10 mm
25 mm
40 mm

Answer explanation

A drop greater than 25 mm in air pressure test indicates leakage.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following gases is identified by flame formation in the upper layer?

CH₄
CO₂
O₂
H₂S

Answer explanation

Methane is detected by flame formation when a safety lamp is lowered into sewer.

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