BHEL electrical Interview questions

BHEL electrical questions:

BHEL interview questions are listed below.

1. Explain about the Torque-speed and Torque-Slip Characteristics of Induction motor?

2. Methods to improve the power factor of Induction motors?

3. Conditions to operate transformers in parallel?

4. Why power transformers are designed for maximum efficiency at full load?

5. Resolve EX-oR gate using Universal gates (nand or nor)?

6. What is the use of capacitor in single phase Induction motor?

7. Explain about the 'V' and inverted 'V' curves of synchronous motor?

8. What is power system stability?

9. Explain about different switching schemes employed in power plant (busbar arrangements)?

10. What is step potential and touch potential?

11. What is string efficiency of insulators?

12. What is electrical corona? conditions that affect the corona?

13. What is surge impedance loading of a line? What happen when load of line is equal to surge impedance loading?

14. Why we use test signals in control systems to find the response of the system?

15. Explain P, I, PI, PD, PID controllers?

16. Differences  open loop and closed loop system

17. What is demand factor, load factor, load curve?

18. How speed of dc shunt motor can be controlled?

19. Different braking methods of dc motor?

20. Applications where dc motors out rule the ac motors?

21. what is the difference between micro processor and micro controller?

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BHEL 2013 General Engineering Previous Paper

BHEL ET general engineering paper 2013:

1. Chlorine acts as bleaching agent in the presence of ___

2. Satellites receive power from ___ (Solar cells)

3. Rotometer is used to measure the ______ (flow rate of fluids and gases)

4. For ideal gas PV/RT is ____ (Unity)

5. Strain Gauge is used to measure ____ (pressure)

6. Type of flow when Reynolds number of fluid is high _____ ( Turbulent)

7. When Iron ball, Wooden ball and cork ball is dropped in to liquid which will reach the bottom first__ (Iron ball)

8. Hook's law is applicable upto the _____ (proportionality limit)

9. Moderator used in nuclear reactor______ (To slowdown the fast neutrons by collision)

10. Fuel used in fast breeder reactor_____ (PU 239 )

11. Which of the following is not an electromagnetic wave____ (Ultra sonic waves)

       a) X ray b) gamma rays c) Cathode rays d) Ultra sonic waves

12. Compression ratio of petrol engine is ____

13. Coplanar forces are _______ (forces acting along the same plane)

14. What is Bakelite ____

15. Bernoulli principle explains about the _____ (energy conservation)

16. When the Length of the simple pendulum is Doubled what happens to energy (Question is something like that) ___

     a) E b) E/2 c) 4E d) 8E

17. LVDT is used to___

18. One question is on Fraunhofer lines?

19. Above curie temperature magnetic materials act as__

20. Synchronous motor has similar construction to ___ (Alternator)

21. Which of the motor is best used for speed control ___ (DC Shunt motor)

22. Variables that define the properties of the gas__ (Question  is something like that)

      a) Pressure b) Volume c) Temperature d) All the above

23. Why boron is used in Stainless steel___ (To reduce corrosion)

24. Definition of Center of Buoyancy

25. Which is hardest __

 a) Cast Iron b) Mild iron c) other options

26. Why rain drop is spherical__ (Surface Tension)

27. Which of the following has low conductivity __

    a) Copper b) Aluminum C) Steel d) Air

28. Which of the following cannot be used as Permanent magnet __

29. One simple question on angular velocity___
30. Magnetic north pole in uniform magnetic field align towards___ (Geometric south of the earth)
31. All electrical machines are __ (electro mechanical conversion devices)

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BHEL 2011 Electrical Previous Question Paper

BHEL Executive Trainee (ET) Electrical previous paper:

Number of Questions:26

I am providing some of the objective questions appeared in the BHEL recruitment exam which i remember. Please correct me if i am wrong

1. MHO  relay is used for the protection of: 

a) Long distance Transmission line

b) Medium length lines

c) Short transmission lines

d) None of the above

2. Reactance Relay is

a) Voltage restrained directional relay

b) Directional restrained over current relay

c) Voltage restrained over current relay

d) None of the above

3. Which relays are doesn't affect by power swings

4. When a transmission line connected in parallel to other transmission line

a) Stability decreases and fault current decreases

b) Stability increases and fault current decreases

c) Stability decreases and fault current increases

d) Stability increases and fault current increases

5. Software interrupts in 8085 microprocessor:

6. Number of address and Data lines in 8085 microprocessor

7. When Halt instruction is executed in microprocessor

8. RL circuit was given and asked to find the value of Inductor

9. Circuit with resistor values are given and asked to solve the equivalent resistance (quite easy circuit given)

10. Small circuit was given and asked to solve the current flowing through the resistor (simple circuit)

11. In the presence of earth capacitance value of  transmission lines ___ (Increases)

12. L-G fault phase difference between positive and negative sequence currents

13. For complete protection of 3 phase line ___ ( Two phase and One earth fault relay is sufficient )

14. During slip test in synchronous motor the voltage across the field wingdings is ___ (zero)

15. Reactive power in synchronous machine is limited by ___ (field current and power angle )

16. For changing the direction of rotation in dc motor armature is used because __

17. Which type of DC motor has negative voltage regulation __

18. Auto transformer voltage transformation ___ (HV-LV)/HV

19. Asked to find out linear system from different equations ___

20. SCR turns off when __ (current falls below holding current )

21. AC voltage converter ___

22. BP register pointing data in __ (Stack Segment )

23. Question related to 8259 and ICW

24. Semi Closed or completely closed rotor bars are employed to __

25. Asked to find phase margin for an open loop transfer function

26. Matrix A, B,C and D is given asked to find transfer function

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BHEL 2013 Electrical Interview Questions

2013 Interview Questions:

These are some of the interview questions asked in BHEL 2013 Electrical Interviews. Questions are collected from the Net and some of my friend's interviews.

Be prepare to answer some basic questions such as

• Tell me about yourself
• What do you know about BHEL
• Why do you want to join BHEL
• Final Year Project  Some basic questions from Bio-data.

Electrical Questions:

1. What are the different conditions for parallel operation of Transformers?
2. What are V and inverted V curves in Synchronous motor and their significance?
3. Explain electrical corona? and methods to reduce the electrical corona?
4. Explain about P, PI and PID controller? Their advantages and disadvantages?
5. What are the different braking methods used in dc motors?
6. What is water hammering phenomenon?
7. Advantages of DC motors over AC motors?
8. What is Load factor, Demand factor, Installed capacity, spinning reserve?
9. Which power plants can be used as a peak load plants. Reason?
10.What is String efficiency in insulators?
11. What is Transient stability and methods to improve transient stability?
12. What is single line diagram and the assumptions required?
13. What is Step Potential and Touch potential in substations?
14. What are different switching schemes employed in substations?
15. How Speed of DC shunt motor is controlled?
16. What is the difference between Microprocessor and Microcontroller?
17. What is SIL and its significance?
18. Realize Ex-OR using NAND gates?
19. What is Race around condition?
20. Why single phase induction motor is not self starting and methods to start single phase induction motor?

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