NRTC NAVEDTRA 14188A ASN 2 FULL
SOLUTIONS TO QUESTIONS –
UPDATED FOR 2026 SUCCESS
1. Basic Components
Question: What are the two basic components of a galvanometer? Answer: A
stationary permanent magnet and a movable coil. Description: Most modern
galvanometers use the D'Arsonval movement. This design consists of a coil of
wire suspended between the poles of a permanent magnet. The interaction between
the two magnetic fields is what produces physical movement.
2. Principles of Rotation
Question: The coil in a galvanometer rotates to allow measurement of current.
Which of the following actions causes this reaction? Answer: Magnetism of
the permanent magnet and magnetism produced by current in the movable
coil. Description: When current flows through the movable coil, it creates an
electromagnetic field. This field reacts with the magnetic field of the permanent
magnet. According to the laws of magnetism, like poles repel and unlike poles
attract, forcing the coil to rotate against a restoring force (usually a spring).
3. The Phosphor Bronze Ribbon
Question: In a galvanometer, the phosphor bronze ribbon serves which of the
following functions? Answer: Each of the above (Provides a path for current,
supports the coil, and provides a restoring force). Description: The phosphor
bronze ribbon is a critical mechanical and electrical component.
It acts as a conductor to bring current into the coil.
It acts as a suspension system to hold the coil in place.
It acts as a tension spring, providing the counter-torque necessary to return
the needle to zero once the current stops.
4. Indicating the Value
, Question: In galvanometers, which of the following components is/are used to
indicate the value of the current being measured? Answer: Both 1 and 2 (A
pointer and a light beam with a mirror). Description: Depending on the
sensitivity required, two methods are used:
1. Pointer: A physical needle attached to the coil that moves across a
graduated scale.
2. Light Beam/Mirror: A small mirror is mounted on the coil; a beam of light
reflects off the mirror onto a distant scale. This method eliminates the weight
of a physical needle, allowing for the measurement of extremely minute
currents.
The phosphor bronze ribbon in the galvanometer serves the same purpose as what
component in the D'Arsonval meter? -ANSWER✔✔Hairspring
The direction in which the D'Arsonval meter pointer deflects depends on what
characteristic of the current applied to the coil? -ANSWER✔✔Polarity
The D'Arsonval meter movement is damped to prevent which of the following
conditions? -ANSWER✔✔Oscillating readings
The weight of the rotating coil assembly and the type of bearings used in the
D'Arsonval meter are factors that affect which of the following characteristics of
the meter? -ANSWER✔✔The sensitivity
For a meter to read linearly, its face is divided into equal segments. What meter
feature makes this possible? -ANSWER✔✔The curved poles of the permanent
magnet
What is the purpose of a shunt in a dc ammeter? -ANSWER✔✔To increase the
current range of the meter
SOLUTIONS TO QUESTIONS –
UPDATED FOR 2026 SUCCESS
1. Basic Components
Question: What are the two basic components of a galvanometer? Answer: A
stationary permanent magnet and a movable coil. Description: Most modern
galvanometers use the D'Arsonval movement. This design consists of a coil of
wire suspended between the poles of a permanent magnet. The interaction between
the two magnetic fields is what produces physical movement.
2. Principles of Rotation
Question: The coil in a galvanometer rotates to allow measurement of current.
Which of the following actions causes this reaction? Answer: Magnetism of
the permanent magnet and magnetism produced by current in the movable
coil. Description: When current flows through the movable coil, it creates an
electromagnetic field. This field reacts with the magnetic field of the permanent
magnet. According to the laws of magnetism, like poles repel and unlike poles
attract, forcing the coil to rotate against a restoring force (usually a spring).
3. The Phosphor Bronze Ribbon
Question: In a galvanometer, the phosphor bronze ribbon serves which of the
following functions? Answer: Each of the above (Provides a path for current,
supports the coil, and provides a restoring force). Description: The phosphor
bronze ribbon is a critical mechanical and electrical component.
It acts as a conductor to bring current into the coil.
It acts as a suspension system to hold the coil in place.
It acts as a tension spring, providing the counter-torque necessary to return
the needle to zero once the current stops.
4. Indicating the Value
, Question: In galvanometers, which of the following components is/are used to
indicate the value of the current being measured? Answer: Both 1 and 2 (A
pointer and a light beam with a mirror). Description: Depending on the
sensitivity required, two methods are used:
1. Pointer: A physical needle attached to the coil that moves across a
graduated scale.
2. Light Beam/Mirror: A small mirror is mounted on the coil; a beam of light
reflects off the mirror onto a distant scale. This method eliminates the weight
of a physical needle, allowing for the measurement of extremely minute
currents.
The phosphor bronze ribbon in the galvanometer serves the same purpose as what
component in the D'Arsonval meter? -ANSWER✔✔Hairspring
The direction in which the D'Arsonval meter pointer deflects depends on what
characteristic of the current applied to the coil? -ANSWER✔✔Polarity
The D'Arsonval meter movement is damped to prevent which of the following
conditions? -ANSWER✔✔Oscillating readings
The weight of the rotating coil assembly and the type of bearings used in the
D'Arsonval meter are factors that affect which of the following characteristics of
the meter? -ANSWER✔✔The sensitivity
For a meter to read linearly, its face is divided into equal segments. What meter
feature makes this possible? -ANSWER✔✔The curved poles of the permanent
magnet
What is the purpose of a shunt in a dc ammeter? -ANSWER✔✔To increase the
current range of the meter
