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Explain each of the following terms as used in cable size calculations: (i) ambient temperature; (ii) voltage drop. (4 marks)craft1 electrical June/July 2020
(i) Ambient temperature: Ambient temperature refers to the temperature of the surrounding environment in which a cable is installed. This is an important factor to consider when selecting a cable, as the temperature rating of the cable should be equal to or higher than the ambient temperature to ensRead more
(i) Ambient temperature: Ambient temperature refers to the temperature of the surrounding environment in which a cable is installed. This is an important factor to consider when selecting a cable, as the temperature rating of the cable should be equal to or higher than the ambient temperature to ensure that the cable can operate safely.
(ii) Voltage drop: Voltage drop refers to the decrease in voltage that occurs along the length of a cable as a result of resistance in the conductor. Voltage drop can be a concern in long-distance or high-power applications, as it can reduce the efficiency of the system and cause the voltage at the load to be lower than the voltage at the source. To minimize voltage drop, it is important to choose a cable with a low resistance and to use a sufficiently large cross-sectional area to carry the required current.
See lessState any three types of cable joints.craft1 electrical June/July 2020
Crimp joints: Crimp joints are made by inserting the cable into a connector and then using a crimping tool to apply pressure to the connector, which secures the cable in place and creates an electrical connection. Solder joints: Solder joints are made by heating a solder wire or rod and applying itRead more
State three methods of soldering cable joints.craft1 electrical June/July 2020
Soldering iron: This method involves using a soldering iron to heat the joint and apply a soldering wire or rod to create a strong, electrical connection. Soldering gun: This method is similar to using a soldering iron, but uses a soldering gun instead. Soldering guns are typically more powerful thaRead more
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
Explain the term filter network.(2 marks)craft1 electrical June/July 2020
A filter network is a circuit that is designed to allow certain frequencies of a signal to pass through while blocking or attenuating others. Filter networks are used to separate or isolate specific frequency components of a signal and can be used for a variety of purposes, such as to remove noise fRead more
A filter network is a circuit that is designed to allow certain frequencies of a signal to pass through while blocking or attenuating others. Filter networks are used to separate or isolate specific frequency components of a signal and can be used for a variety of purposes, such as to remove noise from a signal, to select a particular frequency band for processing, or to shape the frequency response of a system. Filter networks can be passive (consisting only of resistors, capacitors, and inductors) or active (using amplifiers or other active components in addition to passive components). There are many different types of filter networks, including low-pass filters, high-pass filters, band-pass filters, and band-stop filters, which are characterized by their frequency response and their ability to pass or block different frequencies.
See lessSimply 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