Gauge And Thread Inspection Certifications Exam
1. Which standard typically governs the dimensional requirements for inch-based screw
threads?
A) ISO 68-1
B) ASME B1.1
C) ISO 261
D) ISO 898
Correct Answer: B
Explanation: ASME B1.1 covers Unified Inch Screw Threads, specifying their form, dimensions,
and tolerances.
2. Which standard is primarily used for metric screw threads?
A) ASME B1.1
B) ISO 261
C) ANSI B1.20.1
D) ASME B1.5
Correct Answer: B
Explanation: ISO 261 outlines the dimensions and tolerances for standard metric screw threads.
3. What is the main function of a Go/No-Go gauge in thread inspection?
A) To measure the exact pitch diameter
B) To calibrate measuring instruments
C) To quickly determine whether a thread meets tolerance or not
D) To measure the thread lead angle
,Gauge And Thread Inspection Certifications Exam
Correct Answer: C
Explanation: Go/No-Go gauges are designed to check if a thread is within its acceptable
tolerance range without needing an exact measurement.
4. Which of the following components is measured by a thread ring gauge?
A) Internal threads
B) Minor diameter of external threads
C) External threads’ pitch diameter
D) Root radius of a thread
Correct Answer: C
Explanation: A thread ring gauge is used to verify the pitch diameter and functional fit of
external threads.
5. In thread terminology, the distance between two corresponding points on adjacent threads is
known as what?
A) Lead
B) Pitch
C) Crest
D) Flank
Correct Answer: B
Explanation: Pitch is the distance from a point on one thread to the corresponding point on the
next thread, measured parallel to the thread axis.
,Gauge And Thread Inspection Certifications Exam
6. The term “lead” in a single-start thread is equal to which of the following?
A) Twice the pitch
B) The same as pitch
C) Half the pitch
D) Four times the pitch
Correct Answer: B
Explanation: For single-start threads, the lead (axial advance in one full revolution) equals the
pitch.
7. Which thread form is commonly used for power transmission due to its strong and broad
shape?
A) Unified thread
B) Metric thread
C) Square thread
D) Whitworth thread
Correct Answer: C
Explanation: Square threads provide efficient power transmission because of their large contact
area and minimal friction.
8. Which tool is specifically designed to measure the pitch diameter of a screw thread
externally?
A) Thread micrometer
B) Caliper
, Gauge And Thread Inspection Certifications Exam
C) Depth micrometer
D) Ring gauge
Correct Answer: A
Explanation: A thread micrometer has a specialized anvil and spindle designed to measure the
pitch diameter of external threads accurately.
9. Which of the following describes the highest point of a thread?
A) Root
B) Flank
C) Crest
D) Helix
Correct Answer: C
Explanation: The crest is the topmost surface of the thread, opposite the root.
10. Which gauge is typically used to check internal thread dimensions for acceptance?
A) Ring gauge
B) Limit gauge
C) Thread plug gauge
D) Thread measuring wires
Correct Answer: C
Explanation: A thread plug gauge is inserted into a tapped hole to check whether the internal
threads meet the specified tolerance.
1. Which standard typically governs the dimensional requirements for inch-based screw
threads?
A) ISO 68-1
B) ASME B1.1
C) ISO 261
D) ISO 898
Correct Answer: B
Explanation: ASME B1.1 covers Unified Inch Screw Threads, specifying their form, dimensions,
and tolerances.
2. Which standard is primarily used for metric screw threads?
A) ASME B1.1
B) ISO 261
C) ANSI B1.20.1
D) ASME B1.5
Correct Answer: B
Explanation: ISO 261 outlines the dimensions and tolerances for standard metric screw threads.
3. What is the main function of a Go/No-Go gauge in thread inspection?
A) To measure the exact pitch diameter
B) To calibrate measuring instruments
C) To quickly determine whether a thread meets tolerance or not
D) To measure the thread lead angle
,Gauge And Thread Inspection Certifications Exam
Correct Answer: C
Explanation: Go/No-Go gauges are designed to check if a thread is within its acceptable
tolerance range without needing an exact measurement.
4. Which of the following components is measured by a thread ring gauge?
A) Internal threads
B) Minor diameter of external threads
C) External threads’ pitch diameter
D) Root radius of a thread
Correct Answer: C
Explanation: A thread ring gauge is used to verify the pitch diameter and functional fit of
external threads.
5. In thread terminology, the distance between two corresponding points on adjacent threads is
known as what?
A) Lead
B) Pitch
C) Crest
D) Flank
Correct Answer: B
Explanation: Pitch is the distance from a point on one thread to the corresponding point on the
next thread, measured parallel to the thread axis.
,Gauge And Thread Inspection Certifications Exam
6. The term “lead” in a single-start thread is equal to which of the following?
A) Twice the pitch
B) The same as pitch
C) Half the pitch
D) Four times the pitch
Correct Answer: B
Explanation: For single-start threads, the lead (axial advance in one full revolution) equals the
pitch.
7. Which thread form is commonly used for power transmission due to its strong and broad
shape?
A) Unified thread
B) Metric thread
C) Square thread
D) Whitworth thread
Correct Answer: C
Explanation: Square threads provide efficient power transmission because of their large contact
area and minimal friction.
8. Which tool is specifically designed to measure the pitch diameter of a screw thread
externally?
A) Thread micrometer
B) Caliper
, Gauge And Thread Inspection Certifications Exam
C) Depth micrometer
D) Ring gauge
Correct Answer: A
Explanation: A thread micrometer has a specialized anvil and spindle designed to measure the
pitch diameter of external threads accurately.
9. Which of the following describes the highest point of a thread?
A) Root
B) Flank
C) Crest
D) Helix
Correct Answer: C
Explanation: The crest is the topmost surface of the thread, opposite the root.
10. Which gauge is typically used to check internal thread dimensions for acceptance?
A) Ring gauge
B) Limit gauge
C) Thread plug gauge
D) Thread measuring wires
Correct Answer: C
Explanation: A thread plug gauge is inserted into a tapped hole to check whether the internal
threads meet the specified tolerance.
