Multiple Choice Questions (MCQ) on Electronics and Communication Engineering

13-The term critical angle describes

(A) The point at which light is refracted

(B) The point at which light becomes invisible

(C) The point at which light has gone from refractive mode to the reflective mode

(D) The point at which light has crossed the boundary layers from one index to another


14-Which of the following material is not used to make strain gauges?

(A) Nichrome

(B) Pure platinum

(C) Bronze

(D) Karma alloy


15-A Remote Terminal Unit (RTU) in a telemetry system is used for

(A) Providing power to the remote sensors

(B) Converting the output of the sensor to digital data and transmit to the base station

(C) Managing the health condition of the sensors

(D) Remote control the base station


16-All CDMA based technologies 2G and 3G have _____ handovers.

(A) Soft handover

(B) Hard handover

(C) Blind handover

(D) Soft and Hard handover


17-Which of the following is not a mode of operation of SCR?

(A) Forward blocking mode

(B) Forward conduction mode

(C) Reverse blocking mode

(D) Reverse conduction mode


18-Which of the following is not an essential characteristic of robot?

(A) Sensing

(B) Human friendly

(C) Movement

(D) Intelligence


19-The minimum current that can pass the circuit in order for the SCR to remain in the ON state is

(A) Latching current

(B) Reverse saturation current

(C) Holding current

(D) Leakage current


20-In electromagnetic radiation spectrum, the wavelength range for thermal radiation is

(A) 0.1 μm to 100 μm

(B) 0.001 μm to 0.01 μm

(C) 100 μm to 1000 μm

(D) 1000 μm to 2000 μm


21-The damping ratio is strictly less than 1 for a system. Then the system is

(A) Under damped

(B) Over damped

(C) Critically damped

(D) Undamped


22-Which of the following is TRUE for an OPAMP?

(A) Low input resistance

(B) Very high output resistance

(C) Very high input resistance

(D) Low open circuit voltage gain


23-Linear system obeys

(A) Super position theorem

(B) Maximum power transfer theorem

(C) Thevenin’s theorem

(D) Norton’s theorem


24-Ultrasound devices operates with frequencies in the range

(A) 20 KHz – several GHz

(B) 20 KHz – several MHz

(C) 20 Hz – 20 KHz

(D) 20 Hz – 2000 Hz


25-A switching device that converts fixed DC input to a variable DC output voltage directly is

(A) Chopper

(B) Inverter

(C) Regulator

(D) Stabilizer



13-(C), 14-(C), 15-(B), 16-(A), 17-(D), 18-(B), 19-(C), 20-(A), 21-(A), 22-(C), 23-(A), 24-(A), 25-(A)