21 2-56.   When preparing to use an ohmmeter to test a circuit for grounds, you should first take which of the following actions? 1.    Energize the circuit 2.    Disconnect all intentional grounds 3.    Measure the circuit voltage at the power source 4.    Connect all intentional grounds 2-57.   When preparing to use a voltmeter to measure voltage in a circuit, you should first take which of the following actions? 1.    Set the meter to the lowest voltage range 2.    Remove the suspected component from the circuit 3.    Check the voltage from the power source to ensure it is correct 4.    Check the current flow through the circuit with an ammeter 2-58.   It is important to set a voltmeter on its highest range scale before taking a measurement for which of the following reasons? 1. To protect the meter from damage 2. To decrease the effects of input impedance 3. To increase the sensitivity of the measurement 4. To protect the equipment being tested from damage THIS SPACE LEFT BLANK INTENTIONALLY. 2-59.   An accurate measurement of a particular resistor in a set of parallel resistors may be obtained by performing which of the following procedural steps? 1.    Connecting the ohmmeter leads across the resistor while in place 2.    Disconnecting the resistor from the set before taking the measurement 3.    Grounding the resistance set before taking the measurement 4.    Using the highest ohmmeter range Figure 2F.—Circuit. IN ANSWERING QUESTION 2-60, REFER TO FIGURE 2F. 2-60.   To measure R2 with an ohmmeter, (a) in what position should the ON/OFF switch be placed, and (b) where should the test probes be placed? 1.    (a) Off (b) at B and C 2.    (a) Off (b) at C and D 3.    (a) On (b) at C and D 4.    (a) On (b) at B and C 2-61.   In what arrangement is an ammeter connected to a circuit? 1.    In series 2.    In parallel 3.    In a series-parallel combination 4.    In a parallel-series combination