powerpoint presentation...4. in three phase transformer, negative voltage regulation occurs at _____...

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1. _____________ is used to provide artificial neutral earthingwhere neutral point is not accessible.a) Earth transformer –b) Power transformer –c) Potential transformer –d) Current transformer -

2. The spiral hair springs used in moving coil ammeter are madeup of ----------.a) Platinum - bronze - (Alternative 1)b) Phosphor-bronze - (Alternative 4)c) Phosphor - brass - (Alternative 3)d) Phosphor - copper - (Alternative 2)

3. In lap winding of a DC generator, the number of parallel pathsis equal to ___________a) 2 - (Alternative 1)b) Number of poles - (Alternative 2)c) 1 - (Alternative 3)d) Number of Interpoles - (Alternative 4)

4. In three phase transformer, negative voltage regulationoccurs at ___________a) Unity power factor - (Alternative 3)b) Lagging power factor - (Alternative 2)c) Rated KVA of transformer - (Alternative 4)d) Leading power factor - (Alternative 1)

5. The number of cycles completed by an AC quantity in onesecond is called as --------.a) period - (Alternative 1)b) frequency - (Alternative 2)c) power factor - (Alternative 4)d) RMS current - (Alternative 3)

6. In railway electrification, the circuit breaker used is______________a) SF6 circuit breaker - (Alternative 1)b) Bulk oil circuit breaker - (Alternative 3)c) Air blast circuit breaker - (Alternative 2)d) Minimum oil circuit breaker - (Alternative 4)

7. An open circuit test on a transformer gives __________a) Copper loss - (Alternative 2)b) Mechanical loss - (Alternative 4)c) Core loss - (Alternative 1)d) Stray loss - (Alternative 3)

8. The synchronous speed 3 phase,50 Hz, 2 pole double cageinduction motor is --------.a) 6000 RPM - (Alternative 3)b) 3000 RPM - (Alternative 4)c) 1000 RPM - (Alternative 2)d) 1500 RPM - (Alternative 1)

9. ____________ gate is called as a complement of OR gate.a) NOT - (Alternative 1)b) NOR - (Alternative 3)c) NAND - (Alternative 2)d) AND - (Alternative 4)

10. Which fuel is used in nuclear reactor ?a) Lead - (Alternative 3)b) Graphite - (Alternative 2)c) Uranium - (Alternative 1)d) Heavy water - (Alternative 4)

11. An Example for a ferro-magnetic material is----a) Manganese - (Alternative 4)b) Nickel - (Alternative 1)c) Aluminium - (Alternative 2)d) Copper - (Alternative 3)

12. Cables used for 220 kV lines are _________ insulated.a) Paper - (Alternative 2)b) Compressed oil - (Alternative 1)c) PVC - (Alternative 4)d) Mica - (Alternative 3

13. The main function of under voltage protective device generallyemployed with a motor starter is to.a) open the supply circuit on failure of power supply - (Alternative 1)b) control the motor voltage - (Alternative 2)c) decrease the supply voltage - (Alternative 4)d) prevent the opening of supply circuit - (Alternative 3)

14. What is the binary equivalent of the decimal number 13?a) 1111 - (Alternative 1)b) 1011 - (Alternative 3)c) 1101 - (Alternative 4)d) 1001 - (Alternative 2)

15. Which one is the correct formula to find out the frequencyof an alternator?a) 120P/N - (Alternative 1)b) 120/NP - (Alternative 4)c) NP/120 - (Alternative 3)d) 120N/P - (Alternative 2)

16. Earth fault relays are ___________a) Non-directional relays - (Alternative 2)b) Distance relays - (Alternative 1)c) Short operate time relays - (Alternative 3)d) Long operate time relays - (Alternative 4)

17. Which stepper motor gives excellent angular resolution andlow torque?a) Permanent magnet stepper motor - (Alternative 2)b) Variable Inductance stepper motor - (Alternative 3)c) Variable reluctance stepper motor - (Alternative 1)d) Variable resistance stepper motor - (Alternative 4)

18. What is the name of the power generating station whichuses coal as a fuel?a) Atomic power station - (Alternative 2)b) Thermal power station - (Alternative 1)c) Low pressure Mercury Voltage lamps - (Alternative 4)d) Nuclear power station - (Alternative 3)

19. MOSFET is used in _____________ switching frequencyapplication.a) Least - (Alternative 4)b) High - (Alternative 2)c) Low - (Alternative 1)d) Very low - (Alternative 3)

20. PMMC voltmeter is an example for which type ofinstrument?a) Digital type - (Alternative 4)b) Indicating type - (Alternative 1)c) Recording type - (Alternative 3)d) Integrating type - (Alternative 2)

21. _____________ is used to convert DC to AC voltage.a) Chopper - (Alternative 2)b) Inverter - (Alternative 4)c) Rectifier - (Alternative 1)d) Cyclo converter - (Alternative 3)

22. Which one of the following laws deals with electrolysis?a) Faraday's law - (Alternative 4)b) Joule's law - (Alternative 3)c) Ohm's law - (Alternative 1)d) Kirchhoff’s law - (Alternative 2)

23. In the 3 phase double squirrel cage induction motor, theouter cage is wound with bars having ______________,a) low resistance and high inductance - (Alternative 4)b) high resistance and low reactance - (Alternative 1)c) high resistance and high inductance - (Alternative 2)d) low resistance and low inductance - (Alternative 3)

24. The full form of RCCB is --------.a) Remaining Current Circuit Breaker - (Alternative 2)b) Residual Current Circuit Breaker - (Alternative 3)c) Return Current Circuit Breaker - (Alternative 1)d) Rated Current Circuit Breaker - (Alternative 4)

25. _______ can be used to step up DC voltage.a) Inverter - (Alternative 2)b) Chopper - (Alternative 1)c) Snubber - (Alternative 4)d) Cyclo converter - (Alternative 3)

26. The unit of conductivity is _______________a) mho/meter - (Alternative 1)b) ohm/sq.m - (Alternative 4)c) ohm/m - (Alternative 3)d) mho/sq.m - (Alternative 2)

27. Power factor is given by ______________a) Real power/Apparent power - (Alternative 1)b) Reactive power/Apparent power - (Alternative 2)c) Apparent power/Real power - (Alternative 3)d) Apparent power/Reactive power - (Alternative 4)

28. In delta connection if the line voltage is 1732 V then whatwill be the phase voltage?a) 173.2 V - (Alternative 1)b) 1000 V - (Alternative 4)c) 1732 V - (Alternative 2)d) 3000 V - (Alternative 3)

29. The HT winding of a single phase transformer is woundwith----------.a) more number of turns in relatively thick wire - (Alternative 3)b) less number of turns in relatively thin wire - (Alternative 1)c) more number of turns in relatively thin wire - (Alternative 2)d) less number of turns in relatively thick wire - (Alternative 4)

30. The equivalent capacitance of the given circuit is____________

a) 2F - (Alternative 2)b) 3F - (Alternative 3)c) 4F - (Alternative 4)d) 1F - (Alternative 1)

31. The resistance of a copper conductor is ---------.a) more than the resistance of Aluminium - (Alternative 3)b) less than the resistance of silver - (Alternative 1)c) more than the resistance of gold - (Alternative 2)d) more than the resistance of silver - (Alternative 4)

32. In alternator winding, the numerical value of the pitchfactor will always be ----------.a) equal to distribution factor - (Alternative 1)b) less than unity - (Alternative 3)c) more than unity - (Alternative 4)d) equal to unity - (Alternative 2)

33. In three phase delta connection, Line voltage is equal to_____________a) Phase voltage - (Alternative 1)b) Phase Current/√3 - (Alternative 4)c) Phase current - (Alternative 2)d) Phase Voltage/√3 - (Alternative 3)

34. The resistance of shunt field 500 V DC shunt generator is 200ohms. What will be the field current?a) 0.8 Amps - (Alternative 2)b) 10 Amps - (Alternative 1)c) 2.5 Amps - (Alternative 3)d) 7 Amps - (Alternative 4)

35. Heating element of a water heater is made of ----------.a) Nickel - (Alternative 1)b) Tungsten - (Alternative 3)c) Nichrome - (Alternative 4)d) Constantan - (Alternative 2)

36. What is the SI unit of specific resistance?a) Ohm / metre - (Alternative 1)b) Ohm - (Alternative 3)c) Ohm-metre - (Alternative 2)d) Metre / ohm - (Alternative 4)

37. What is the numerical value of the form factor of the pureAC sine wave?a) 0.636 - (Alternative 2)b) 1.412 - (Alternative 4)c) 0.707 - (Alternative 3)d) 1.11 - (Alternative 1)

38. The difference of level between the points of support and thelower point of the conductor of a transmission line is -----------.a) Span - (Alternative 4)b) Clearance - (Alternative 3)c) Slag - (Alternative 1)d) Sag - (Alternative 2)

39. One millivolt is equal to --------.a) 0.1 volt - (Alternative 3)b) 0.001 volt - (Alternative 1)c) 0.01 volt - (Alternative 2)d) 0.1000 volt - (Alternative 4)

40. Which type of rotor is best suitable for medium and slowspeed operation in synchronous motor ?a) Salient pole rotor - (Alternative 1)b) Smooth cylindrical type rotor - (Alternative 2)c) Split ring rotor - (Alternative 4)d) Slip ring rotor - (Alternative 3)

41. ______________ relay has the capability to detect a majorfault in transformer.a) Buchholz - (Alternative 2)b) Distance - (Alternative 3)c) Directional - (Alternative 4)d) Over current - (Alternative 1)

42. The supply frequency of a three-phase induction motorhaving 'P' number of poles with synchronous speed 'Ns' is givenas _______________a) f=120P/f - (Alternative 4)b) f=120Ns/P - (Alternative 1)c) f=NsP/120 - (Alternative 3)d) f=NsP/60 - (Alternative 2)

43. Rectifier is used to convert _________ voltage.a) AC to DC - (Alternative 3)b) AC to AC - (Alternative 1)c) DC to AC - (Alternative 4)d) DC to DC - (Alternative 2)

44. The value of the capacitive reactance of a capacitor when it isconnected with AC supply will be ---------.a) inversely proportional to the supply frequency - (Alternative 3)b) directly proportional to the supply voltage - (Alternative 1)c) inversely proportional to the supply voltage - (Alternative 2)d) directly proportional to the supply frequency - (Alternative 4)

45. The unit of electric field intensity is ______________a) Coulomb/m² - (Alternative 2)b) Weber - (Alternative 3)c) Coulomb - (Alternative 1)d) Newton/Coulomb - (Alternative 4)

46. The DC series motor should be connected with the load bymeans of ----------.a) direct coupling drive - (Alternative 4)b) direct V belt drive - (Alternative 1)c) direct chain drive - (Alternative 3)d) direct flat belt drive - (Alternative 2)

47. If two inductors of 2mH and 3mH are connected in seriesacross the 250V 50Hz AC supply, then the total inductivereactance will be ---------a) 31.42 Ohms - (Alternative 3)b) 1.57 Ohms - (Alternative 4)c) 3.142 Ohms - (Alternative 2)d) 5 Ohms - (Alternative 1)

48. Skin effect in a conductor becomes more pronounced_____a) At lower frequency - (Alternative 4)b) At DC voltage - (Alternative 1)c) At ramp voltage - (Alternative 3)d) At high frequency - (Alternative 2)

49. The unit of resistance is expressed in terms of_____________a) mho - (Alternative 2)b) ohm/m - (Alternative 3)c) ohm - (Alternative 1)d) m/ohm - (Alternative 4)

50. How many number of parallel paths will be in simplex 4 polewave winding?a) 4 - (Alternative 2)b) 8 - (Alternative 4)c) 2 - (Alternative 1)d) 6 - (Alternative 3)

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Electrical Engineering by ASHISH SIR

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Electrical Engineering by ASHISH SIR

Electrical Engineering by ASHISH SIR

Electrical Engineering by ASHISH SIR

Electrical Engineering by ASHISH SIR

Electrical Engineering by ASHISH SIR

Electrical Engineering by ASHISH SIR

Electrical Engineering by ASHISH SIR

(28) In a steam power plant…………heats the feed water on its way to the boiler by delivering heat from the flue gases: -

(A) Superheater (B) Economizer

(B) Preheater (D) Turbine

(29) Power generation of thermal power plants is based on: -

(A) Rankine cycle

(B) Otto cycle

(C) Diesel cycle

(D) Carnot cycle