E4A10 (D) 
Which of the following is a useful test for a functioning NPN transistor in an active circuit where the transistor should be biased "on" ?
A. Measure base-to-emitter resistance with an ohmmeter; it should be approximately 6 to 7 ohms
B. Measure base-to-emitter resistance with an ohmmeter; it should be approximately 0.6 to 0.7 ohms
C. Measure base-to-emitter voltage with a voltmeter; it should be approximately 6 to 7 volts
D. Measure base-to-emitter voltage with a voltmeter; it should be approximately 0.6 to 0.7 volts
