Ques:- When a field input to plc is coming from 400 to 600 meters and the input is in 24 V DC? So signal cable of which cross section i should select for proper signal to plc?
Right Answer: For a 400 to 600 meter distance with a 24 V DC signal, you should select a signal cable with a cross-sectional area of at least 0.5 mm² to minimize voltage drop and ensure proper signal integrity.
Ques:- In thermocouple could we use the lug for termination or not,Thermocouple is any time,I am currently concerned with K type.please let me know if anybody know
Right Answer: Yes, you can use a lug for termination in a K-type thermocouple, but ensure that the lug material is compatible with the thermocouple wires to avoid measurement errors.
Right Answer: DOL (Direct On Line) starter directly connects the motor to the power supply, providing full voltage and current at startup. Star-Delta starter initially connects the motor in a star configuration to reduce voltage and current during startup, then switches to delta for normal operation. An Automatic Star-Delta starter performs this switching automatically without manual intervention.
Right Answer: You can save energy by using a variable frequency drive (VFD) to optimize the motor's speed and torque, improving efficiency at lower loads. Additionally, consider implementing power factor correction and regular maintenance to ensure the motor operates efficiently.
Ques:- How are various factors of production affected by globalcompetition? Do we manage people any differently in aglobally competitive environment?
Asked In :-
Right Answer: Global competition affects various factors of production by increasing the demand for efficiency, innovation, and cost-effectiveness. Companies may need to adopt new technologies and improve processes to stay competitive. In a globally competitive environment, managing people may involve a greater focus on cultural diversity, remote collaboration, and continuous skill development to adapt to changing market needs.
Right Answer: To set a transformer differential relay, follow these steps:
1. **Determine the Transformer Ratings**: Identify the primary and secondary voltage and current ratings of the transformer.
2. **Select the Relay Settings**: Choose the appropriate settings for the relay based on the transformer’s rated current and the desired sensitivity.
3. **Set the CT Ratios**: Input the current transformer (CT) ratios for both primary and secondary sides into the relay.
4. **Adjust the Differential Current Setting**: Set the differential current (often a percentage of the rated current) to detect faults while avoiding nuisance tripping.
5. **Set the Time Delay**: Configure the time delay settings to allow for temporary inrush currents during normal operation.
6. **Test the Settings**: Perform functional tests to ensure the relay operates correctly under fault conditions.
7. **Document the Settings**: Record all settings and configurations for future reference and maintenance.
