In single-mode fibres, the cladding diameter must be at least 1) Five times the core diameter 2) Thrice the core diameter 3) Ten times the core diameter 4) Twice the core diameter

In a PN junction the potential barrier is due to the charges on either side of the junction, these charges are 1) Majority carriers 2) Minority carriers 3) Fixed donor and accepter ions 4) Both (a) and (b) ...

Number of secondary electrons emitted per number of primary electrons depends on 1) Material of target 2) Frequency of primary electrons 3) Intensity 4) None of the above

In a diode, when there is saturation current, the plate resistance is 1) Zero 2) Infinite 3) Some finite quantity 4) Data is insufficient

For a common base configuration of PNP transistor Ic/IE = 0.98 then the maximum current gain in common emitter configuration will be _______. 1) 6 2) 12 3) 18 4) 24

Voltage regulators require 1) Only line regulation 2) Only load regulation 3) A constant load 4) Load and line regulation

Which of the following shows bond in silicone? 1) 1 2) 2 3) 3 4) 4