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Armature resistance is measured at rated current to ensure that the resistance reflects the operational conditions under which the machine will typically run. This measurement accounts for factors such as temperature, which can affect resistance values, ensuring accuracy in performance predictions. Additionally, testing at rated current helps identify any potential issues that may arise during normal operation, such as overheating or inefficiencies. Overall, this approach provides a more realistic and reliable assessment of the armature's performance in practical applications.
What else can I help you with?
Can we get speeds above rated speed by armature resistance control method?
Yes, speeds above the rated speed can be achieved using the armature resistance control method in DC motors. By increasing the armature resistance, the voltage drop across the resistance can be manipulated, allowing for higher speeds. However, this approach is limited and can lead to inefficiencies, overheating, and reduced torque at higher speeds. Therefore, while it is possible, it is generally not the most efficient or practical method for achieving high speeds.
What is the magnetization characteristic of the DC machine?
magnetisation characteristic of dc generator is nothing but the open circuit characteristic of dc generator where we determine the operating characteristics of dc machines.it is used to determine the open circuit armature voltage keeping armature current zero,at rated speed and after few laps of time filed current is gonig to be raised from zero.where the armature open circuit voltage is reached above its rated value. '
How can measure transformer KVA?
the capacity of a transformer is defined as a product of voltage and current flowing through it.AS THE CURRENT IS MEASURED IN AMPERES AND VOLTAGE IN VOLTS, Hence transformers are measured/rated in KVA
What is DCR in transformers?
It is dc resistance, use to measure the rated current at primary and secondary side
What is the difference between rated current In and tripped current?
"Rated current" is the current the device (motor or transformer?) is designed to handle at full load. "Tripping current" is the current where a protective device (fuse, breaker) will open to protect the device from overload/overheating. "Tripped current", may be the current the tripping device measured prior to making the decision to trip, if you are reading this from a digital protective device like a relay or OCR.
Can we get speeds above rated speed by armature resistance control method?
Yes, speeds above the rated speed can be achieved using the armature resistance control method in DC motors. By increasing the armature resistance, the voltage drop across the resistance can be manipulated, allowing for higher speeds. However, this approach is limited and can lead to inefficiencies, overheating, and reduced torque at higher speeds. Therefore, while it is possible, it is generally not the most efficient or practical method for achieving high speeds.
What is short circuit ratio of an alternator?
Short circuit ratio is the ratio of field current required for the rated voltage at open circuit to the field current required for the rated armature current at short circuit
What is the magnetization characteristic of the DC machine?
magnetisation characteristic of dc generator is nothing but the open circuit characteristic of dc generator where we determine the operating characteristics of dc machines.it is used to determine the open circuit armature voltage keeping armature current zero,at rated speed and after few laps of time filed current is gonig to be raised from zero.where the armature open circuit voltage is reached above its rated value. '
What is the current of a 25volt resistor?
Resistors are rated in ohms for their resistance value and in watts for the power they are capable of handling. They are not rated in volts or current.
Why Cable gets heated when current flows more than its rated current why?
Because if the rated current is lower than the actual current, it causes resistance to the electrical flow which in turn is dispelled as heat.
How can measure transformer KVA?
the capacity of a transformer is defined as a product of voltage and current flowing through it.AS THE CURRENT IS MEASURED IN AMPERES AND VOLTAGE IN VOLTS, Hence transformers are measured/rated in KVA
What is DCR in transformers?
It is dc resistance, use to measure the rated current at primary and secondary side
Why is there less current in a circuit with four bulbs than there is in a circuit with one bulb?
yes because of bulb resistance :)
Define generator short circuit ratio?
Checked Stephen J. Chapman's Electric Machinery Fundamentals page 287. It says: Short Circuit Ratio (SCR) for the synchronous generator is the ratio of the field current required for the rated voltage at OPEN circuit to the field current require for the rated armature current at SHORT circuit.
Whet does 4-8 ohms mean?
this is range of 4 ohms resistance in an electrical device. Ohms is a measure of resistance in electrical qualities. Circuits and devices are rated , or measured for there resistance in ohms to meet a designed electrical need. Is this related to a speaker?
Is four point starter is applicable to compound motor?
Yes! · To accelerate the motor to the rated speed · To limit the starting current in the armature to a safe value · To disconnect the motor in case of a supply failure or overload
How do you check for amperage draw in a 12 volt car electrical system?
Place a current meter (rated for several hundred amps) in series with the battery. Or Place a large gauge wire of known resistance in series with your battery, use a high precision volt meter to measure the voltage drop across this piece of wire, then divide the measured voltage drop by the resistance of the wire. This will give you the current traveling through it.
