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