Synopsis of Electrical Engineering

Important Multiple Choice questions on Power Systems 1.        For transmission line which one of the following relations is true? A)      AD-BC=1 B)       –AD-BC=1 C)       AD-BC=-1 D)      AD-BC=0 2.        For a given base voltage and base volt-amp, the per unit impedance value of an element is X. what will be the per-unit impedance value of this element when the voltage and volt-amp bases are both doubled? A)      4X B)       2X C)       X D)      0.5X 3.        A 3-phase transmission line has its conductors at the corners of an equilateral triangle with side 3m. the diameter of each conductor is 1.63 cm. the inductance of the line per phase per km is A)      1.232 mH B)       1.182 mH C)       1.093 mH D)      1.043 mH 4.        A cable has inductance of 0.22mH per km and capacitance of 0.202 micro farads per km. the surge impedance of the cable is A)      28 ohms B)       33 ohms C)       42 ohms D)      50 ohms 5.        The capacitanc

Installation & Commissioning of 315 KVA dry type transformer Schedule of quantity Note: This schedule of quantity is for providing an idea regarding item specifications during the execution of the above work. Rates are subjected to vary from time to time.  Sl. No. Description of item Unit Quantity Rate  (Rs) Amount (Rs.) 1 Removal of transformer yard fencing by carefully removing the nut bolts etc., Decommissioning of the existing 630 KVA, 11/0.4 kV oil transformer and shifting of transformer from the platform to the safe area within substation according the instructions of engineer in charge. job 1 7,500/- 7,500/- 2 Shifting of the 315 KVA, 11KV/433 V Cast Resin Dry type transformer from substation area to platform including locking of transformer wheels and re-fixing the fencing to original condition etc as directed by the engineer

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Important Multiple Choice Questions On Power Systems 1.        Plug-setting of a relay can be altered by varying A)      Number of ampere-turns B)       Air gap of magnetic path C)       Adjustable back up stop D)      None of these 2.        If the time of operation of a relay for unity TMS is 10 sec, the time of operation of 0.5 TMS will be A)      20 Sec B)       5 Sec C)       10 Sec D)      None of these 3.        Where the voltages are high and current to be interrupted is low, the breaker proffered is A)      Air blast CB B)       Oil CB C)       Vacuum CB D)      Any of these 4.        Resistance switching is normally employed in A)      All breakers B)       Bulk oil breakers C)       Minimum oil breakers D)      Air blast circuit breakers 5.        For protection of rotating machines against lightning surges a combination of A)      Lighting conductor and capacitors are used B)       Lighting conductor and lighting arrestors

Important multiple choice questions on power systems 1.        Which one of the following statements is true? A)      Steady state stability limit is greater than transient state stability limit B)       Steady state stability limit is equal to transient state stability limit C)       Steady state stability limit is less than the transient stability limit D)      No generalisation can be made regarding the equality of otherwise of the steady state stability limit and transient stability limit 2.        If the integral control of a single area system, when  the system frequency error is reduced to zero A)      The integrator output and the speed changer position attains a constant value B)       The integrator output increases but the speed changer position also comes down C)       The integrator output decreases and the speed changer position also comes down D)      The integrator output decreases but the speed changer position moves up 3.        The steady-st