Electronics MCQ Questions and Answers

21- Signal flow graph is used to find
(A) Poles of the system
(B) Transfer function of the system
(C) Controllability of the system
(D) Stability of the system
22- Sensitivity of optical receivers is measured in
(A) W (watt)
(B) WA (watt ampere)
(C) A / W (ampere / watt)
(D) W / A(watt per ampere)
23- Shottky clamping is resorted to in TTL gates
(A) To increase fan out
(B) To increase packing density
(C) To increase noise margin
(D) To reduce propagation delay
24- A common emitter amplifier, with a self-bias circuit to bias the transistor in the active region is an example of
(A) Class C amplifier
(B) Class B amplifier
(C) Class AB amplifier
(D) Class A amplifier
25- The triac can be used only in
(A) amplifier
(B) chopper
(C) rectifier
(D) inverter
26- The maximum power- efficiency of an AM modulation is
(A) 100 %
(B) 75 %
(C) 50 %
(D) 25 %
27- Colpitts oscillator circuit uses
(A) Three inductors
(B) One inductor and one capacitor
(C) Two inductors and one capacitor
(D) Two capacitors and one inductor
28- Inverters find applications in
(A) rectifiers
(B) HVAC transmission
(C) DC drives
(D) UPS
29- Waveguides are used at
(A) Mid-frequencies
(B) Video frequencies
(C) Audio frequencies
(D) Microwave frequencies
30- Noise is a/an
(A) Exponential signal
(B) Random signal
(C) Periodic signal
(D) Deterministic signal
ANSWERS:
21-(B), 22-(C), 23-(D), 24-(D), 25-(B), 26-(C), 27-(D), 28-(D), 29-(D), 30-(B)