
Lesson 2.1
Quiz
•
Engineering
•
University
•
Practice Problem
•
Hard
wansaidatulakma zainol
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of a galvanometer?
To measure heavy currents
To detect electric currents
To generate electric currents
To control electric circuits
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when the switch is closed?
The current stops flowing to the moving coil
The coil experiences an attractive force
The coil moves to the position
The permanent magnet poles react with the coil
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What determines the amount of force experienced by the coil?
The position of the coil
The permanent magnet poles
The current passing through the coil
The switch being closed
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when the switch is closed?
The coil moves to the position shown in Figure 2
The coil experiences a force proportional to the current passing through it
Current flows to the moving coil of PMMC
Opposite poles attract
5.
OPEN ENDED QUESTION
3 mins • 1 pt
A PMMC instrument with a 100-turn coil has a magnetic flux density in its air gaps of B = 0.2T. The coil dimensions are D= 1cm and L = 1.5cm. Calculate the torque on the coil for a current of 1mA.
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6.
OPEN ENDED QUESTION
3 mins • 1 pt
A PMMC instrument has a coil of area 10mmx8mm. The flux density in the air gap is 0.15 Wb/m². If the coil is wound for 100 turns, carrying a current of 5mA. Calculate the deflecting torque.
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7.
OPEN ENDED QUESTION
3 mins • 1 pt
A PMMC instrument with a 150 turns and internal resistance,Rm = 20Ω deflects at 120° with 100mV supply. If the coil surface area, A = 5.4 x 10-4 m & spring constant k = 0.375 x 10-6 Nm/rad, calculate the magnetic field density, B.
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