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Electrical engineering and simple physics MCQ with answers.  1.What is Ohm's Law used to calculate? a) Voltage b) Current c) Resistance d) Power 2.What is the unit of electrical resistance? a) Coulomb b) Volt c) Ohm d) Watt 3.How is alternating current (AC) different from direct current (DC)? a) AC has a higher voltage than DC b) AC changes direction, while DC does not c) AC is more efficient than DC d) AC is less expensive than DC 4.What is a transformer used for in an electric circuit? a) To increase the voltage b) To decrease the voltage c) To increase the current d) To decrease the resistance 5.What is a diode used for in an electric circuit? a) To rectify AC to DC b) To amplify a signal c) To store electrical energy d) To switch the circuit on and off

 electrical transformer / basic explain. A transformer is an electrical device that is used to transfer electrical energy between two or more circuits through electromagnetic induction. It consists of two or more coils of wire, known as the primary and secondary coils, which are wrapped around a core made of iron or another magnetic material. When an alternating current (AC) flows through the primary coil, it creates a varying magnetic field that is linked to the secondary coil through the core. This varying magnetic field causes an AC current to flow in the secondary coil, transferring energy from the primary circuit to the secondary circuit. One of the key features of a transformer is that it allows for the voltage of an electrical current to be increased or decreased. This is done by manipulating the number of turns in the primary and secondary coils. For example, if the number of turns in the secondary coil is greater than the number of turns in the primary coil, the voltage in...

In a p⁺n junction diode under reverse bias , the magnitude of electric field is maximum at A.  The edge of the depletion region on the p-side B.  The edge of the depletion region on the n-side C.  The p⁺n junction D.  The center of the depletion region on the n-side Answer:  Option C

  In a CB amplifier the maximum efficiency could be. Electrical Engineering / analog electronics. A. 99% B. 85% C. 50% D. 25% Answer: Option D

The action of JFET in its equivalent circuit can best be represented as a A.  Current controlled Current source B.  Current controlled voltage source C.  Voltage controlled voltage source D.  voltage controlled current source Answer:  Option D

 Time Delays in 8051 C Micro controller / electric engineering. We can create time delay in 8051 C by two ways: Using for loop statement . Using the 8051 timers We cannot get the exact delays using simple for loops because of following reasons: 1. The instruction execution speed varies according to the number of clock periods per machine cycle. The different variants of 8051 microcontroller use different clock periods per machine cycle. 2. The crystal frequency connected to the X₁-X₂ input pins. The duration of the clock period for the machine cycle is a function of this crystal frequency. 3. In case of C programs, it is the C compiler that converts the C statements and functions to assembly language instructions. As a result different compilers produce different code and hence instructions executed in a loop may vary with different compilers.