26 Figure 3G.—Ratio detector. IN ANSWERING QUESTIONS 3-31 THROUGH 3-40, REFER TO FIGURE 3G. 3-31.   To what frequency(ies) are (a) L1 and C1 and (b) L2 and C2 tuned? 1.   (a) Center frequency (b) lower frequency limit 2.   (a) Center frequency (b) center frequency 3.   (a) Lower frequency limit (b) center frequency 4.   (a) Lower frequency limit (b) lower frequency limit 3-32.   What circuit filtering function do R5, C6, and C7 provide? 1.   Low-pass 2.   High-pass 3.   Band-pass 4.   Band-reject 3-33.   At resonance, what type of circuit does the tank circuit appear to be? 1.   Reactive 2.   Resistive 3.   Inductive 4.   Capacitive 3-34.   At resonance, what is the phase relationship between tank current and primary voltage? 1.   Tank current leads primary voltage by 90 degrees 2.   Tank current lags primary voltage by 90 degrees 3.   Tank current and primary voltage are in phase 4.   Tank current and primary voltage are out of phase 3-35.   At resonance, what relative amount of conduction takes place through CR1 compared to that for CR2? 1.   CR1 conducts more than CR2 2.   CR1 conducts less than CR2 3.   CR1 and CR2 conduct the same amount 3-36.   At resonance, (a) will the charges on C3 and C4 be equal or unequal, and (b) will their polarities be the same or opposite? 1.   (a) Equal (b) same 2.   (a) Equal (b) opposite 3.   (a) Unequal (b) opposite 4.   (a) Unequal (b) same 3-37.   ABOVE resonance, both voltages e₁ and e 2 have specific phase shift relationships to voltage e in that they either shift nearer to or farther from the phase of e_p.  What are the phase relationships between (a) e₁ and e_p and (b) e₂ and e_p? 1.   (a) e₁ is nearer to e_p (b) e₂ is nearer to e_p 2.   (a) e₁ is nearer to e_p (b) e₂ is farther from e_p 3.   (a) e₁ is farther from e_p (b) e₂ is nearer to e_p 4.   (a) e₁ is farther from e_p (b) e₂ is farther from e_p