14 2-8.   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? 1.    The accuracy and the linearity of the meter scales 2.    The amount of restraining force required of the hairspring 3.    The maximum current that can be measured 4.    The sensitivity 2-9.   For a meter to read linearly, its face is divided into equal segments.  What meter feature makes this possible? 1.    The curved poles of the permanent magnet 2.    The jeweled bearings in the meter movement 3.    An additional coil placed in the meter circuit 4.    A long, lightweight meter pointer 2-10.   What is the purpose of a shunt in a dc ammeter? 1.    To decrease the sensitivity of the meter 2.    To increase the linearity of the meter movement 3.    To increase the current range of the meter 4.    To decrease meter damping 2-11.   A particular D'Arsonval meter has a full- scale current reading of 1 milliampere.   A full-scale reading of 100 milliamperes may be achieved by using which of the following components? 1.    A low-value resistance placed in series with the meter terminals 2.    A high-value resistance placed in series with the meter terminals 3.    A movable coil composed of large- diameter wire 4.    A resistance of proper value placed in parallel with the meter terminals 2-12.   To measure 10 milliamperes on a 1- milliampere D'Arsonval meter movement, a shunt resistance is added that will carry 9 milliamperes.  What maximum value of current will pass through the meter movement? 1.    1 milliampere 2.    3 milliamperes 3.    6 milliamperes 4.    9 milliamperes 2-13.   In a meter movement, shunt strips with a zero temperature coefficient are used instead of regular carbon resistance for which of the following reasons? 1.    Because regular carbon resistances cause interfering magnetic fields 2.    Because regular carbon resistances are too large to be used 3.    Because regular carbon resistances are not able to handle the current changes 4.    Because regular carbon resistances are affected by heat due to current and cause readings to vary 2-14.   One consideration in choosing the value of a meter shunt resistance is that the meter readings should be in the midscale range.  Which of the following factors is another consideration? 1.    Meter switching is easier for midscale deflection 2.    Meter shielding against magnetic interference is greatest near midscale 3.    Minimum loading effect will be experienced near midscale 4.    The meter is protected from unexpected surge currents 2-15.   For which of the following current ranges would you likely use a meter that contains internal shunt? 1.      1 to 10 amperes 2.    11 to 30 amperes 3.    31 to 50 amperes 4.    All of the above