Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Describe the operation of SCR.(4 marks)craft1 electrical June/July 2020
An SCR (silicon controlled rectifier) is a type of three-terminal semiconductor device that acts as a switch and can be used to control the flow of current in a circuit. The operation of an SCR is based on the ability of the device to be turned on (conducting) or off (non-conducting) by the applicatRead more
An SCR (silicon controlled rectifier) is a type of three-terminal semiconductor device that acts as a switch and can be used to control the flow of current in a circuit. The operation of an SCR is based on the ability of the device to be turned on (conducting) or off (non-conducting) by the application of a voltage to its gate terminal. When an SCR is turned off, it acts like an open circuit and does not allow current to flow through it. When it is turned on, it acts like a closed circuit and allows current to flow through it.
The main characteristics of SCR operation are:
State four types of flip-flops.(4 marks)craft1 electrical June/July 2020
SR flip-flop: The SR flip-flop (also known as a "set-reset" flip-flop) is a basic type of flip-flop that has two inputs (S and R) and two outputs (Q and Q'). The state of the flip-flop is controlled by the S and R inputs, which can be used to set the flip-flop to the "set" state (Q = 1, Q' = 0) or tRead more
Outline the procedure of testing P-N junction diode for defects.(4 marks)craft1 electrical June/July 2020
Set up the test equipment: Connect a digital multimeter (DMM) in the "diode test" or "continuity" mode to the diode under test, and ensure that the DMM is properly calibrated. Test the forward bias characteristics: Apply a small forward bias voltage to the diode (usually around 0.7 V for a silicon dRead more
Outline three areas of applications of filter networks.(3 marks)craft1 electrical June/July 2020
Signal processing: Filter networks are used in signal processing systems to extract specific frequency components of a signal for further processing or to remove unwanted frequencies (such as noise). Communication systems: Filter networks are used in communication systems to separate the different fRead more
Simply the Boolean expression: Y =(A+B) (A+C)(4 marks)craft1 electrical June/July 2020
To simplify the given Boolean expression, we can use the distributive property to expand the expression: Y = (A+B) (A+C) = A(A+C) + B(A+C) = AA + AC + BA + BC We can then simplify further using the fact that AA = A and BB = B: Y = A + AC + BA + B = A + AC + BA + B = A + AC + BA + B = A + AC + BA + BRead more
To simplify the given Boolean expression, we can use the distributive property to expand the expression:
Y = (A+B) (A+C) = A(A+C) + B(A+C) = AA + AC + BA + BC
We can then simplify further using the fact that AA = A and BB = B:
Y = A + AC + BA + B = A + AC + BA + B = A + AC + BA + B = A + AC + BA + B
This expression is already in the simplest form possible, so it cannot be simplified further. Therefore, the simplified Boolean expression is Y = A + AC + BA + B.
See lessPerform each of the following binary arithmetic: i. 1011 x 1101; ii. 11000 —111 (6 marks)craft1 electrical June/July 2020
i. 1011 x 1101; 1011 * 1101 ----- 1011 1011 1101 ----- 11100 ii. 11000 —111 1011 * 1101 ----- 1011 1011 1101 ----- 11100
i. 1011 x 1101;
1011
* 1101
—–
1011
1011
1101
—–
11100
ii. 11000 —111
1011
* 1101
—–
1011
1011
1101
—–
11100
State two causes of harmonic distortion in transistor amplifiers.(2 marks)craft1 electrical June/July 2020
Nonlinearity of the transistor: Transistors have a nonlinear current-voltage characteristic, which means that the current flowing through the transistor is not directly proportional to the voltage applied to it. This nonlinearity can cause harmonic distortion in the output signal. Saturation of theRead more
Define harmonic distortion with reference to audio amplifiers.(2 marks)craft1 electrical June/July 2020
Harmonic distortion is a type of distortion that occurs in audio amplifiers when the output signal contains additional frequency components that are not present in the input signal. These additional frequency components, called harmonics, are multiples of the fundamental frequency of the input signaRead more
Harmonic distortion is a type of distortion that occurs in audio amplifiers when the output signal contains additional frequency components that are not present in the input signal. These additional frequency components, called harmonics, are multiples of the fundamental frequency of the input signal and can cause the output signal to deviate from the original waveform. Harmonic distortion can be caused by a variety of factors, including the nonlinear behavior of the amplifier itself, the load being driven by the amplifier, and the presence of noise or other interference in the system. Harmonic distortion can cause the sound produced by the amplifier to be harsh or unpleasant, and it can also affect the accuracy and fidelity of the reproduced audio.
See lessList two: examples of secondary cells (2 marks)craft1 electrical June/July 2020
Lead-acid batteries: These are commonly used in vehicles and are made up of lead-based electrodes and a sulfuric acid electrolyte. Nickel-cadmium batteries: These are commonly used in portable electronic devices and are made up of nickel and cadmium electrodes and a potassium hydroxide electrolyte.Read more
List two:properties of primary cells: (2 marks)craft1 electrical June/July 2020
Primary cells are self-discharging, meaning that they cannot be recharged and must be replaced when the chemical reaction that generates the electrical current is complete. Primary cells have a finite lifespan, and their capacity (the amount of electrical energy they can produce) decreases as they aRead more