Electronic Devices And Circuits - Study Mode
[#226] The solar or photo voltaic cell converts:
Correct Answer
(B) Solar radiation to electrical energy
[#227] Silicon has a preference in IC technology because
Correct Answer
(D) of the availability of nature oxides SiO 2
[#228] For a common-base BJT configuration having I C = 5 mA and α = 0.97, an AC signal of 5 mV is applied between the base and emitter terminals. What is the value of output impedance and current gain?
Correct Answer
(B) ∞, 0.97
[#229] The unit of mobility is
Correct Answer
(A) m 2 V -1 s -1
[#230] Consider a silicon sample at T = 300 K, with a uniform donor density N d = 5 × 10 16 cm -3 illuminated uniformly such that the optical generation rate is G opt = 1.5 × 10 20 cm -3 s -1 throughout the sample. The incident radiation is turned off at t = 0. Assume low-level injection to be valid and ignore surface effects. The carrier lifetimes are τ p0 = 0.1 µs and τ n0 = 0.5 µs. The hole concentration at t = 0 and the hole concentration at t = 0.3 µs, respectively, are
Correct Answer
(A) 1.5 × 10 13 cm -3 and 7.47 × 10 11 cm -3