APCPDCL-SUBENGINEERS 2010 Previous Paper

APCPDCL-SUBENGINEERS 2010 KEY PAPER

1.       Value of  εo=-------------------

2.       Relation b/w E,Q and V------------

3.       In a RC series circuit the  initial current is --------------

4.       In a RC series circuit At resonance the p.f. -------------

5.       The complex form of Magnitude 100 and Phase shift 30⁰  _{-------------------------}

6.       v=100sin1256t find f=--------------

7.       If temperature increases dielectric constant----------

8.        High thermal conductivity is for---------

     a)solid ice  b)melting ice  c)steam  d) water

9.       Peak to peak voltage is 100v then the rms voltage is-------

10.    The effective value of a triangular wave------

11.   Magnetic flux density can be expressed in-------------

12.    Resonance frequency----------

13.    Mutual coupling M=--------------

14.   If load increases speed of DC motor--------------------

15.   In a DC shunt motor Rsh=200ohm, I=20A, v=250V, find Ia=-------

16. In a DC generator Eg1=200v, N1=1000 rpm find the induced emf at

        1200 rpm-------

17. For a dc machine before the saturation the relation b/w torque and Ia--------

18. The DC motor has constant loss=100w, fl cu loss400w, max efficiency occurs at in 

       terms of fl load----------

19. Commutator function in dc gen------------

20. Max power of a motor when Eb=-----------

21. Back slip for IM---------------

22. S1=0.03, r2=0.25 for fl torque, an external resistance of 0.75 added, find out the new    

      slip corresponding to the fl torque--------

23. Transformer works on the principle of ---------

24.R1=0.1ohm, and K=5, Find the resistance referred to secondary---

25. As the airgap increases in an alteranor increase the--------------

26. For centrifugal pumps which type of motor used--------

27.1000kw, 0.8 lag means------------(The motor can withstand upto 1000kw

      at 0.pf lag and rated voltage)

28.The max power developed in an alternator at angle of-----------

29. For a 4 pole, 3 Φ IM, the poles , frequency and load reduced to half then the new 

        Speed----------

30. High efficiency in which power plant---------

31. water hammering effect can be avoided by using----------

32. In nuclear power plant control rods are made up of----------

33. which shape of conductors are used to reduced corona--------

34.Lead sheaths are used in order to protect the cable from---------

35.pin type insulators are used upto----------------

36. The purpose of breather in Transformer---------

37.The purpose of transformer oil--------

38. The lighting arresters are installed nearer to---------

39.Horn gap fuses are used for protecting---------------

40. Mho relays are used for -------------

41.communication interference with ---------- type of system

42.Merz-price protection for generator is provided for----

43.conncetion for polemounted transformer--------

44. Series capacitors are used in transmission line------

45.surge impedance of a transmission line-------

46. Rupturing capacity of CB expressed in----

47. In power factor correction capacity of a capacitor expressed in -------

48. Fusing factor-------

49. For welding which type of motor used--------

50.In home applications fans, tubes circuits are connected in -------------------

51.Units for Luminous flux----------

52. 1Phot=-------

53.stroboscopic effect in---------

       a)incandescent  b)fluorescent   c)sodium vapour lmap

54.Non- ferrous metals can be heated--------

    a)dielectric b)inuction c)direct resistance

55.For welding Al material which type of welding used-----

      a)DC arc b)gas        v)AC arc

56.Kando system--------

57. The shape of main line traction---------

58. For train lighting which type of battery used-------

59.Capacitor function in MV lamp------------

60. As –ve feed back of an amplifier increases --------

61.Adding of two binary numbers is called-----------

    a)half adder b)full adder c)binary adder

62. which region has most heavily doped------

63.Barrier potential of a p-n junction is caused by-----

64.current gain for CE--------

      a)high   b)medium   c)low

65.Traic can’t be used in----------

       a )R load      b) RL load c) load with back emf

66.Latching current of an SCR ------------

67.FET can be used as----------

68. An oscillator is--------------

69. Lissajous pattern obtained on a CRO can be used to determine--------

70. 8051 has ----------no.of interrupts including reset

71.HSC in PLC------

72.Code for double division in PLC-------

73.For high inductive loads the input and output current waveforms---

74. For midpoint cycloconverter the o/p voltage interms of frequency--------

75. Modbus purpose in PLC-----------

       a)serial communication b) parallel communication c)serial – parallel

76. In MC system the scale is ----------

77. For measuring 40v, 75hz which type of meter used-------

78. The overall efficiency in thermal plant----------

79.Economiser is used to -------

80. Circuit breaker-----------

81. Ferranti effect occurs at---------

82. If temperature increases dielectric constant----------

83.Fly wheel is used for------------

84. Most versatile memory in 8051------------

85. The equal resistance b/w a and b--------

86. Thermal runaway is due to-----------------

87. Thevenins voltage------------

88. Lamps and fans are controlled by switch with---------- wire

89. For busbar----------------- protection is used

OTHER PAPERS AP TRANSCO ELECTRICAL - TECHNICAL PAPER             SUB-ENGINEERS TECHNICAL PAPER 2012             ENGINEERS TECHNICAL PAPER 2012             ELECTRICAL PAPER -SOME IMPORTANT QUESTIONS AP GENCO - TECHNICAL PAPER             TECHNICAL PAPER 2012             TECHNICAL PAPER 2011 AP CPDCL ELECTRICAL - TECHNICAL PAPER             TECHNICAL PAPER 2010 BHEL ELECTRICAL - - TECHNICAL PAPER             TEHNICAL PAPER 2010             TEHNICAL PAPER 2009