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Assignment Questions - 14175_193
Assignment Questions - 14175_195

Neets Module 03-Introduction to Circuit Protection, Control, and Measurement
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2 1-8.   Current through a meter results in the pointer. In d'Arsonval meter movement, what force produces this deflection? 1.    Thermocouple action 2.    Electrostatic repulsion 3.    Mechanical spring tension 4.    The interaction of magnetic fields 1-9.   The hairsprings in a d'Arsonval meter movement perform which of the following functions? 1.    They keep the pointer in the position of the last indication when current is removed 2.    They aid the movement of the pointer when there is current through the meter 3.    They make electrical connections to the meter movement 4.    All of the above Figure 1-B.Compass and wire (ac). IN ANSWERING QUESTIONS 1-10 AND 1-11, REFER TO FIGURE 1-B. 1-10.   If the frequency of the ac source is 5 Hz, how will the compass needle react when S1 is closed? 1.    It will swing back and forth 2.    It will point directly at the wire 3.    It will point directly away from the wire 4.    It will vibrate rapidly around magnetic north 1-11.   If the frequency of the ac source is 200 Hz, how will the compass needle react when S1 is closed? 1.    It will swing back and forth 2.    It will point directly at the wire 3.    It will point directly away from the wire 4.    It will vibrate rapidly around magnetic north 1-12.   What device allows a d'Arsonval meter movement to measure ac by converting ac to pulsating dc? 1.    A pulsator 2.    A modulator 3.    A rectifier 4.    A converter 1-13.   What is meant by the term "meter damping"? 1.    Moistening the felt pads 2.    Smoothing the oscillations of the pointer 3.    Preventing excessive current through the coil 4.    Compensating for electromagnetic induced interference 1-14.   Which of the following methods is used to dampen a meter? 1.    Mount the meter in a mu-metal case 2.    Install a fuse in one of the input leads 3.    Incorporate an airtight chamber containing a van 4.    Provide a fluid reservoir and sponge arrangement next to the pads






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