Ques:- What are the protection schemes used for protection oftransformers ?
Asked In :-
YOKOGAWA IA TECHNOLOGIES INDIA, metro trains melbourne,
Ques:- WHY WE USE 4-20mA
Asked In :-
Daimler India Commercial Vehicles, ELYSIUM GROUP OF COMPANIES, allegion, plc, selec controls pvt. ltd., relativity, samtra,
Right Answer:
We use 4-20mA because it provides a standard signal range that allows for accurate measurement and control, ensures that the signal can be distinguished from noise, and allows for easy detection of sensor faults when the signal is below 4mA.
We use 4-20mA because it provides a standard signal range that allows for accurate measurement and control, ensures that the signal can be distinguished from noise, and allows for easy detection of sensor faults when the signal is below 4mA.
Ques:- What happen when ct secondary are open circuited? why samething is not happen in ordinary transformer?
Asked In :-
cnooc,
Right Answer:
When the CT (current transformer) secondary is open-circuited, it can cause a very high voltage to develop across the secondary terminals, potentially damaging the CT and connected equipment. This happens because the CT is designed to operate with a closed circuit to maintain a specific current ratio. In an ordinary transformer, the primary and secondary windings are designed to handle open-circuit conditions without generating harmful voltages, as they are not intended to measure current but to transfer power.
When the CT (current transformer) secondary is open-circuited, it can cause a very high voltage to develop across the secondary terminals, potentially damaging the CT and connected equipment. This happens because the CT is designed to operate with a closed circuit to maintain a specific current ratio. In an ordinary transformer, the primary and secondary windings are designed to handle open-circuit conditions without generating harmful voltages, as they are not intended to measure current but to transfer power.
Ques:- What is the voltage of insulation megger that should be used for measuring the resitance of 66kv equipments.
Asked In :-
newcrest mining,
Ques:- WHAT ARE THE CAUSES
Asked In :-
Ques:- What happens when a power transformer neutral earthing broken???
Asked In :-
Shree Cement, UK Civil Aviation Authority, sse plc, southwest gas corporation, hatch mott macdonald, evolution mining, deepak nitrite ltd, cng engineering,
Ques:- What are the complete specifications of a motor?.
Asked In :-
Right Answer:
The complete specifications of a motor include:
1. **Type of Motor**: AC, DC, Servo, Stepper, etc.
2. **Power Rating**: Measured in horsepower (HP) or kilowatts (kW).
3. **Voltage Rating**: Operating voltage (e.g., 230V, 400V).
4. **Current Rating**: Full load current (A).
5. **Frequency**: Operating frequency (Hz).
6. **Speed**: Rated speed (RPM).
7. **Efficiency**: Efficiency percentage (%).
8. **Torque**: Rated torque (Nm or lb-ft).
9. **Insulation Class**: Insulation rating (e.g., Class B, F, H).
10. **Frame Size**: Physical dimensions and mounting type.
11. **Service Factor**: Indicates overload capacity.
12. **Cooling Method**: Type of cooling (e.g., IC01, IC06).
13. **Duty Cycle
The complete specifications of a motor include:
1. **Type of Motor**: AC, DC, Servo, Stepper, etc.
2. **Power Rating**: Measured in horsepower (HP) or kilowatts (kW).
3. **Voltage Rating**: Operating voltage (e.g., 230V, 400V).
4. **Current Rating**: Full load current (A).
5. **Frequency**: Operating frequency (Hz).
6. **Speed**: Rated speed (RPM).
7. **Efficiency**: Efficiency percentage (%).
8. **Torque**: Rated torque (Nm or lb-ft).
9. **Insulation Class**: Insulation rating (e.g., Class B, F, H).
10. **Frame Size**: Physical dimensions and mounting type.
11. **Service Factor**: Indicates overload capacity.
12. **Cooling Method**: Type of cooling (e.g., IC01, IC06).
13. **Duty Cycle
Ques:- Will you sign a bond of 2 years with us?
Right Answer:
Yes, I am willing to sign a bond of 2 years with your company.
Yes, I am willing to sign a bond of 2 years with your company.
Ques:- Which %age of corona losses increses if frequency isincreased to 25%.
Right Answer:
The percentage of corona losses increases by approximately 56.25% if the frequency is increased by 25%.
The percentage of corona losses increases by approximately 56.25% if the frequency is increased by 25%.
Ques:- Give me list of material for wiring of 20hp motor?
Asked In :-
newcrest mining, vikram solar,
Right Answer:
1. Copper or aluminum wire (appropriate gauge)
2. Insulation (PVC or XLPE)
3. Conduit (PVC or metal)
4. Connectors (lugs, terminals)
5. Circuit breaker or fuse
6. Motor starter (contactor and overload relay)
7. Grounding wire
8. Junction boxes
9. Cable ties and clamps
10. Electrical tape
1. Copper or aluminum wire (appropriate gauge)
2. Insulation (PVC or XLPE)
3. Conduit (PVC or metal)
4. Connectors (lugs, terminals)
5. Circuit breaker or fuse
6. Motor starter (contactor and overload relay)
7. Grounding wire
8. Junction boxes
9. Cable ties and clamps
10. Electrical tape
Ques:- How to understand the controling circuits example star-delta-starter controling daigram please let me know
Asked In :-
York Region, petronas,
Ques:- What is scan time of PLC & in which factor scan time is decide
Asked In :-
First TransPennine Express, Maritime & Coastguard Agency, Pedalheads Bike Camps, Ecesis group of companies, Afcons Infrastructure, sandvik, trans maldivian airways, kbx logistics llc, etihad rail, sose,
Ques:- Can Induction motor run at over rated speed? ( 15oo rpm is rated speed for 50HZ. is it possible to ride 3000 RPM with same motor with the help of VVVFD for continues ride of 100HZ)
Asked In :-
smiths detection, selec controls pvt. ltd.,
Right Answer:
Yes, an induction motor can run at an over-rated speed using a Variable Voltage Variable Frequency Drive (VVVFD) by increasing the frequency to 100 Hz, allowing it to reach approximately 3000 RPM. However, this should be done with caution, as it may affect the motor's performance and lifespan.
Yes, an induction motor can run at an over-rated speed using a Variable Voltage Variable Frequency Drive (VVVFD) by increasing the frequency to 100 Hz, allowing it to reach approximately 3000 RPM. However, this should be done with caution, as it may affect the motor's performance and lifespan.
Ques:- What is the differnt between open loop and close loop ?
Asked In :-
ETO, KSRTC, Tata Marcopolo, umicore, impala platinum, bgc engineering, africa world airlines limited, ddi, utkarsh tubes and pipes limited, edinburgh trams,
Ques:- What do you look for in a job?
Asked In :-
ADNOC Abu Dhabi National Oil Company,
Right Answer:
I look for opportunities to grow my skills, a collaborative team environment, and a role that allows me to contribute to quality improvement in products.
I look for opportunities to grow my skills, a collaborative team environment, and a role that allows me to contribute to quality improvement in products.
Ques:- What happan when ac power transmitted in unity power factor
Asked In :-
Nordex,
Right Answer:
When AC power is transmitted at unity power factor, it means that the voltage and current are in phase, resulting in maximum efficiency. There are no reactive power losses, and the entire power is used effectively for doing work.
When AC power is transmitted at unity power factor, it means that the voltage and current are in phase, resulting in maximum efficiency. There are no reactive power losses, and the entire power is used effectively for doing work.
Ques:- How we calculate the spacing between the conductors in 11,33KV lines?
Asked In :-
Ques:- How long would it take you to make a meaningfulcontribution to our firm?
Asked In :-
Prism Cement,
Right Answer:
I believe I can make a meaningful contribution within the first three to six months, as I will quickly familiarize myself with the team, processes, and projects.
I believe I can make a meaningful contribution within the first three to six months, as I will quickly familiarize myself with the team, processes, and projects.
