PMMC

A moving-coil instrument has the following data: number of turns = 100, width of coil = 20 mm, depth of coil= 30 mm, flux density in the gap = 0.1 Wb/m². Calculate the current if deflecting torque is 60 × 10^-6 Nm

• 10 mA

• 100 mA

• 1 mA

• None of the above

It occurs when you view the pointer of an analog multimeter from another angle and misinterpret the measurement.

• Paralax

• Parrallax

• Parallax Errors

• Parrallax Errors

What is the role of the controlling system in a PMMC instrument?

• A) It provides the damping torque to prevent oscillations.

• B) It generates the deflecting torque to move the pointer.

• C) It opposes the deflecting torque to ensure proportional deflection.

• D) It brings the pointer to the final steady-state position.

Which of the following is caused by careless handling?

• Systematic error

• Gross error

• Random error

• None of the mentioned

A current-carrying rectangular coil placed in a uniform magnetic field. In which orientation will the coil rotate?

• In any orientation

• The magnetic field is parallel to the plane of the coil

• The magnetic field is at 45⁰ with the plane of the coil

• The magnetic field is perpendicular to the plane

Which is the controlling method used in PMMC

• gravity control

• spring control

• both

• neither

A moving-coil instrument has the following data: number of turns = 100, width of coil = 20 mm, depth of coil= 30 mm, flux density in the gap = 0.1 Wb/m². Calculate the current if deflecting torque is 60 × 10^-6 Nm

• 10 mA

• 100 mA

• 1 mA

• None of the above