169. In Frequency modulation,
A. frequency of the carrier remains constant
B. carrier frequency varies in accordance with the modulating signal amplitude
C. carrier frequency varies in accordance with the modulating signal frequency
D. none of these

---

170. An FM signal contains intelligence in
A. its frequency variations
B. its amplitude variations
C. both amplitude and frequency variations
D. none of these

---

171. In an FM signal, there are
A. no sidebands
B. two sidebands, upper and lower
C. infinite number of sidebands
D. none of these

---

172. In an FM signal, number of significant sidebands depends upon modulation index. This statement is
A. true
B. false
C. not necessarily true
D. none of these

---

173. Modulation index of an FM signal of commercial FM radio broadcast is given by
A.25
B.50
C.75
D. none of these

---

174. Modulation index (mi) in FM is
A. directly proportional to frequency deviation and inversely proportional to the modulating frequency
B. given by mf
C.x100Frequency deviation in kHz
D.(c) directly proportional to modulating signal frequency and inversely proportional to frequency deviation

---

175. Identical peak amplitudes. It there is no correction network, FM signal for A shall have a smaller frequency deviation than that for B. Comment !
A. This is not possible
B. This thing can happen only under special circumstances
C. The statement is absolutely true
D. Both the signals have identical frequency deviation

---