UPSC Recruitment Paper 2018 : Lecturer

(Electronics & Communications Engineering)

1. Which of the following is oBtained By drawing a single crystal from a melt of germanium whose type is changed during the drawing process By adding first p-type and then n- type impurities?
1. Alloy junction
2. Diffused junction
3. Grow junction
(a) 1 only
(B) 2 only
(c) 3 only
(d) 1, 2 and 3

2. Circuits that are used to eliminate portions of a signal that are above or Below a specified level are called:
(a) Clampers
(B) Clippers
(c) Voltage douBlers
(d) Detectors

3. The circuit consisting of an op-ap comnnected in a non-inverting configuration and two RC networks connected as the frequency-selecting feed Back circuit is called:
(a) Phase shift oscillator
(B) Colpitts oscillator
(c) Hartley oscillator
(d) Wien-Bridge oscillator

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