MASTER PLUMBER PAST BOARD
EXAM QUESTIONS SET 1 AND
ANSWERS
/. Of the four board subjects given for Master Plumbers examination, which of this
subject was originally split into two subjects?
A. Plumbing Code
B. Design and Installations
C. Plumbing Arithmetic
D. Practical Problems - Answer-✅D
/.Copper tube and fittings used for drainage and vent piping installed aboveground shall
be at least ____.
A. Type DWV
B. Type L
C. Type K
D. Type M - Answer-✅A
/.A domestic dishwasher drain shall first connect to ____.
A. an approved airgap fitting
B. a double-check valve
C. a triple-check valve
D. an approved valve - Answer-✅A
/.Unions shall be installed in a water supply system within ____ to a water heater
A. 36 inches
B. 12 inches
C. 24 inches
D. 48 inches - Answer-✅B
/.A branch line serving a trap in a combination waste and vent system is required to be
separately vented when the length of the branch exceeds ____.
A. 15
B. 10
,C. 5
D. 25 - Answer-✅A
/.Three-inch horizontal drainage piping shall be run in practical alignment and at a
uniform slope of not less than:
A. 1/4 inch per foot
B. 1/16 inch per foot
C. 1/2 inch per foot
D. 1/8 inch per foot - Answer-✅A
/.The minimum requirement for the slope of horizontal drainage pipes between
manholes is
A. 4%
B. 2-1/2 %
C. 2%
D. 3% - Answer-✅C
/.A drain connecting the compartments of a set of fixtures to its trap is called a(an) ____.
A. continuous waste
B. special waste
C. indirect waste
D. combination waste and vent - Answer-✅A
/.The maximum number of lavatories on a 2-1/2 inch horizontal waste line is ____.
A. 10
B. 14
C. 20
D. 6 - Answer-✅B
/.The maximum distance a gas shutoff valve may be from a gas appliance (except for
range and dryer connectors) is ____.
A. 6 feet
B. 10feet
C. 3 feet
D. 2 feet - Answer-✅A
/.An ejector discharge line shall be provided with a ____
A. gate valve only
B. backwater valve and gate valve
C. backwater valve only
, D. swing check valve and a globe valve - Answer-✅B
/.In the water test of the entire plumbing system all openings should be tightly closed
except at
A. protruding cleanouts
B. bleeders
C. stack vent
D. highest opening - Answer-✅D
/.Because of structural conditions, a 4-inch house drain is installed with a slope of 1/8
inch per foot. This installation will result in a(an) ____.
A. increased scouring and cleansing action
B. reduction in fixture unit loading allowance
C. separation of solids and liquid
D. increased allowance in fixture unit loading - Answer-✅B
/.A ____ may be installed with indirect waste
A. water closet
B. domestic kitchen sink
C. drinking fountain
D. lavatory - Answer-✅C
/.A ____ trap is not self-cleaning
A. plaster
B. cast-iron
C. bell
D. grease - Answer-✅D
/.Chemical or industrial liquid wastes that are likely to damage the public sanitary sewer
system shall ____.
A. be pretreated to render them innocuous
B. not be used under any condition
C. be drained into a holding tank
D. be drained into a storm drain - Answer-✅A
/.A seamless drawn-brass fixture tailpiece shall be ____.
A. 24 B&S gauge
B. 20 B&S gauge
C. 22 B&S gauge
EXAM QUESTIONS SET 1 AND
ANSWERS
/. Of the four board subjects given for Master Plumbers examination, which of this
subject was originally split into two subjects?
A. Plumbing Code
B. Design and Installations
C. Plumbing Arithmetic
D. Practical Problems - Answer-✅D
/.Copper tube and fittings used for drainage and vent piping installed aboveground shall
be at least ____.
A. Type DWV
B. Type L
C. Type K
D. Type M - Answer-✅A
/.A domestic dishwasher drain shall first connect to ____.
A. an approved airgap fitting
B. a double-check valve
C. a triple-check valve
D. an approved valve - Answer-✅A
/.Unions shall be installed in a water supply system within ____ to a water heater
A. 36 inches
B. 12 inches
C. 24 inches
D. 48 inches - Answer-✅B
/.A branch line serving a trap in a combination waste and vent system is required to be
separately vented when the length of the branch exceeds ____.
A. 15
B. 10
,C. 5
D. 25 - Answer-✅A
/.Three-inch horizontal drainage piping shall be run in practical alignment and at a
uniform slope of not less than:
A. 1/4 inch per foot
B. 1/16 inch per foot
C. 1/2 inch per foot
D. 1/8 inch per foot - Answer-✅A
/.The minimum requirement for the slope of horizontal drainage pipes between
manholes is
A. 4%
B. 2-1/2 %
C. 2%
D. 3% - Answer-✅C
/.A drain connecting the compartments of a set of fixtures to its trap is called a(an) ____.
A. continuous waste
B. special waste
C. indirect waste
D. combination waste and vent - Answer-✅A
/.The maximum number of lavatories on a 2-1/2 inch horizontal waste line is ____.
A. 10
B. 14
C. 20
D. 6 - Answer-✅B
/.The maximum distance a gas shutoff valve may be from a gas appliance (except for
range and dryer connectors) is ____.
A. 6 feet
B. 10feet
C. 3 feet
D. 2 feet - Answer-✅A
/.An ejector discharge line shall be provided with a ____
A. gate valve only
B. backwater valve and gate valve
C. backwater valve only
, D. swing check valve and a globe valve - Answer-✅B
/.In the water test of the entire plumbing system all openings should be tightly closed
except at
A. protruding cleanouts
B. bleeders
C. stack vent
D. highest opening - Answer-✅D
/.Because of structural conditions, a 4-inch house drain is installed with a slope of 1/8
inch per foot. This installation will result in a(an) ____.
A. increased scouring and cleansing action
B. reduction in fixture unit loading allowance
C. separation of solids and liquid
D. increased allowance in fixture unit loading - Answer-✅B
/.A ____ may be installed with indirect waste
A. water closet
B. domestic kitchen sink
C. drinking fountain
D. lavatory - Answer-✅C
/.A ____ trap is not self-cleaning
A. plaster
B. cast-iron
C. bell
D. grease - Answer-✅D
/.Chemical or industrial liquid wastes that are likely to damage the public sanitary sewer
system shall ____.
A. be pretreated to render them innocuous
B. not be used under any condition
C. be drained into a holding tank
D. be drained into a storm drain - Answer-✅A
/.A seamless drawn-brass fixture tailpiece shall be ____.
A. 24 B&S gauge
B. 20 B&S gauge
C. 22 B&S gauge
