Free Electronics MCQs with Answers

• A. One diode
• B. Two diodes
• C. Three diodes
• D. Four diodes

Explanation: Half wave rectifier uses one diode to limit the flow of current in one direction only.

• A. Larger the peak-to-peak value of the ripple voltage
• B. Larger the peak current in the rectifying diode
• C. Longer the time the current pulse flows through the diode
• D. Smaller the voltage across the load

Explanation: C= ΔQ/ΔV = I x t/ΔVIf C increases, t increases for constant input power and voltage.

• A. 50Hz
• B. 100Hz
• C. 200Hz
• D. 150Hz

Explanation: Correct Option:BThis option is correct because in the output of bridge rectifiers one half cycle is repeated, the frequency will be twice…

• A. 0.532 Vmax
• B. 0.637 Vmax
• C. 0.759 Vmax
• D. 0.437 Vmax

Explanation: This option is correct because the current flowing through the load is unidirectional, so the voltage developed across is also…

• A. Current is high
• B. Current is low
• C. Voltage is high
• D. Volatge is low

Explanation: Correct Option: B When the current is low a satisfactory performance is achievedIn summary, the satisfactory performance of a capacitor…

• A. Half wave
• B. Full wave
• C. Bridge
• D. All of the above

Explanation: A rectifier is an electrical device that converts alternating current, which periodically reverses direction, to direct current, which…

• A. 1.21
• B. 0.8
• C. 0.6
• D. 0.4

Explanation: The ripple factor determines how well a halfwave rectifier can convert AC voltage to DC voltage.

• A. Phase wave rectifier
• B. Full wave
• C. Half wave
• D. None of these options are correct

Explanation: A phase wave rectifier is not a type of rectifier.

• A. AC to DC
• B. DC to AC
• C. AC to triangular current
• D. DC to triangular current

Explanation: A rectifier is a device that is used to convert an Alternating Current to a Direct Current. Hence Option A is correct.

• A. 25Hz
• B. 50Hz
• C. 100Hz
• D. Zero

Explanation: The frequency of the output voltage or current in a full-wave rectifier is double the input frequency.

• A. Vm
• B. Vm/√2
• C. 2Vm
• D. Vm/√3

Explanation: The maximum voltage across reverse bias in a center tap full-wave rectifier is 2Vm.

• A. Reversed biased
• B. Forward biased
• C. Potential barrier
• D. None of these options are correct

Explanation: During half-wave rectification of AC, during one half of the cycle, the diode is forward biased while during the other half (negative…

• A. None of these
• B. 1.3
• C. 0.48
• D. 1.21

Explanation: Ripple factor is the ratio of the RMS value of an alternating current component in the rectified output to the average value of rectified…

• A. Fullwave rectifier
• B. Bridge rectifier
• C. Halfwave rectifier
• D. Both bridge and full wave rectifiers

Explanation: Ripples are the fluctuations within the output of a rectifier. Ripple factor measures the efficiency of a rectifier.

• A. A
• B. B
• C. C
• D. D

Explanation: There are 3 inputs/ gates in the given lohic gate. Two are NOR (OR+NOT) gates with an output of (Ā+B) and the third gate is an AND gate…

• A. A
• B. B
• C. C
• D. D

Explanation: This a truth table of OR logic gate and the logic gate corresponds to OR gate. option A is correct.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: In the following diagrams, A is a NOT gate. B is a OR gate, C is AND gate and D is a symbol for PN junction diode.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: Option B shows the I-V curve of a junction diode. This curve represents the behavior of the diode under both forward and reverse bias…

• A. OR
• B. AND
• C. NOR
• D. NAND

Explanation: We can check to which gate this diagram refers to by sending in 1 from A and 0 from B.Output at X, after working, will be 1.

• A. A
• B. A AND C
• C. B
• D. NO CORRECT OPTION

Explanation: A.B means that A AND B imply that 0 AND 0 should give 1, 1 and 0 should give 1 and 1 and 1 should give 0.