a. Manual mopping and vacuum cleaning.
b. Active drainage recovery.
c. Vacuum mopping recovery.
d. Dryers recovery.
e. Vapour recovery.
Description : Name the methods by which D20 leak can be detected.
Last Answer : a. By beetles. b. D20 losses through stack monitoring. c. Tritium monitoring. d. In heat exchangers the leakage can be found by taking samples of process water from all heat exchanges and counting the tritium activity.
Description : Name the features for reducing D20 leaks.
Last Answer : a. Reduce valves and fittings in the pipelines. b. Use welded joints instead of flanged joint.
Description : Why spillage of D20 is to be avoided?
Last Answer : Cost consideration: D20 very costly and very valuable. Cleaning of spillage also cost and extra manpower to be deployed. Tritium hazard: D20 contains tritium, which when spilled becomes tritiated vapour and finds access through human body. Tritium is a radioactive material. It is a beta emitter.
Description : Define reactor grade and down graded D20.
Last Answer : Reactor grade D20: If the isotopic purity of a given D20 is more than or equal to 99.7% then the D20 is reactor grade D20. Down grade D20: If the isotopic purity of a given D20 is less than 99.7% then the D20 is downgraded.
Description : What is the amount of D20 used in moderator?
Last Answer : 140 tonnes.
Description : How D20 vapour is recovered?
Last Answer : Dryer recovers D20 vapour.
Description : The effective size of particles of soil is denoted by (A) D10 (B) D20 (C) D30 (D) D60
Last Answer : (A) D10
Description : What are some good methods to speed up the recovery time after getting your wisdom teeth pulled?
Last Answer : Mine were impacted when I had them removed. They gave me a prescription for Perkaden (sp?) but I never needed to fill it as I never had any real pain. I would think a little Motrin should get you through. Unless you have a dry socket, you should get by okay.
Description : Tunnel diode is a: a) Power diode b) Has light doping c) Has heavy doping d) Is a reverse recovery diode Ans: C 76.LEDs are fabricated from: a) Silicon b) Germanium c) Si or Ge d) Gallium arsenide
Last Answer : Ans: D
Description : What is recovery voltage in circuit breaker?
Last Answer : Recovery voltage in circuit breakers is defined as the power frequency rms voltage which appears across the breaker contacts after the transient oscillations die out and the final extinction of the arc ... poles of the circuit breaker. It is the voltage developed after the arc extinction is competed
Description : What are the advantages of slip power recovery system?
Last Answer : In chopper method of speed control for SRM, the slip power is wasted in the external resistance and the efficiency also reduced. However, instead of wasting the slip power can be recovered by various ... slip power can be recovered and fed back to the supply. So the overall efficiency also improved.
Description : What is meant by recovery voltage?
Last Answer : The power frequency rms voltage appearing across the breaker contacts after the arc is extinguished and transient oscillations die out is called recovery voltage.
Description : Which of the methods listed is used to maintain the division of load between two compound-wound, DC generators operating in parallel? A. The shunt fields are interconnected. B. The shunt ... generators are connected in series. D. The equalizer connection parallels the series fields of all machines.
Last Answer : Answer: D
Description : Which of the methods listed is used to start a AC generator turning? A. Residual magnetism remaining in the field poles. B. Residual magnetism remaining in the field coils. C. Residual magnetism remaining in the armature. D. Rotation by a mechanical prime mover.
Description : Under normal conditions, storage batteries used for starting the emergency diesel generator are maintained in a charged state by which of the following methods? A. Trickle charging B. Fast charging C. Equalizing charge D. Reverse charging
Last Answer : Answer: A
Description : The operator of electrical motors should keep a constant check on the loads they carry because _____________. A. low loads necessitate frequent insulation cleaning B. exceeding nameplate values shortens ... wasted if full loading is not utilized D. power factor correction methods are load dependent
Last Answer : Answer: B
Description : Which of the following methods should be used to test for an 'open' coil in an AC motor stator? A. Test with an ohmmeter, one test lead on the shaft, and the other test lead to the stator leads ... an open coil. D. Use a growler, listening for noise and vibration to increase when over an open coil.
Description : Which of the following methods should be used to dress the face of silver-plated contacts? A. Filing B. Burnishing C. Sanding with 0000 sandpaper D. All of the above are correct.
Last Answer : Answer: C
Description : Which of the methods listed is used to maintain equal load sharing between two compound wound DC generators operating in parallel? A. The shunt fields are interconnected. B. The shunt field rheostats ... are connected in series. D. The series fields of both generators are connected in parallel.
Description : Methods to control speed of Wound Rotor Motors?
Last Answer : The speed of wound rotor motors are changed by changing the slip of the motor. This can be achieved by: Varying the stator line voltage Varying the resistance in the rotor circuit Inserting and varying a foreign voltage source in the rotor circuit
Description : What are methods available for making single phase induction motor a self starting?
Last Answer : By slitting the single phase, by providing shading coil in the poles.
Description : What are the two methods of control in ac voltage controllers?
Last Answer : a. ON-OFF control b. Phase control
Description : What are the methods of reduction of harmonic content?
Last Answer : a. Transformer connections b. Sinusoidal PWM c. Multiple commutation in each cycle d. Stepped wave inverters
Description : What are the different methods of firing circuits for line commutated converter?
Last Answer : a. UJT firing circuit. b. The cosine wave crossing pulse timing control. c. Digital firing schemes.
Description : What are the different methods to turn on the thyristor?
Last Answer : a. Forward voltage triggering b. Gate triggering c. dv/dt triggering d. Temperature triggering e. Light triggering
Description : What are the different turn on methods of SCR?
Last Answer : Forward voltage triggering Gate Triggering dv/dt triggering Temperature triggering Light triggering
Description : What are the methods of checking the phase difference?
Last Answer : 1. All Dark lamp method 2. Two bright one dark lamp method 3. Synchroscope
Description : Name the various methods for predetermining the voltage regulation of 3-phase Alternator.
Last Answer : The following are the three methods which are used to predetermine the voltage regulation of smooth cylindrical type Alternators · Synchronous impedance / EMF method · Ampere-turn / MMF method · Potier / ZPF method
Description : List some methods of cooling of transformers.
Last Answer : A:Air natural, Air blast, Oil Natural, Oil natural air forced, Oil natural water forced, Oil forced, Oil forced air natural, Oil forced air natural, Oil forced water forced.
Description : What are the methods adopted to reduce harmonic torques?
Last Answer : The methods used for reduction or elimination of harmonic torques are chording, integral slot winding, skewing and increasing the length of air gap.
Description : List out the methods to improve the power factor of the induction motor.
Last Answer : The power factor of the induction motor can be improved by reducing the magnetizing current and leakage reactance. The magnetizing current can be reduced by reducing the length of air gap. The ... stator & rotor slots, by providing short chorded winding and reducing the overhang in stator winding.
Description : List out the methods of speed control of cage type 3-phase induction motor?
Last Answer : a) By changing supply frequency b) By changing the number of poles c) By operating two motors in cascade
Description : What are the methods for determining depreciation charges?
Last Answer : The decrease in the value of the power plant equipment and building due to constant use is known as depreciation. The cost of depreciation will depend on the size and type of equipment ... equals the cost of equipment. The methods commonly used for determination of annual depreciation charges are
Description : What are the advantages of synthetic testing methods?
Last Answer : The breaker can be tested for desired transient recovery voltage and RRRV. Both test current and test voltage can be independently varied. This gives flexibility to the test The method is simple With ... capacity (MVA) of five time of that of the capacity of the test plant can be tested.
Description : What are the indirect methods of circuit breaker testing?
Last Answer : o Unit test o Synthetic test o Substitution testing o Compensation testing o Capacitance testing
Description : Give the two methods of arc interruption?
Last Answer : High resistance interruption:-the arc resistance is increased by elongating, and splitting the arc so that the arc is fully extinguished Current zero method:-The arc is interrupted at current zero position that occurs100 times a second in case of 50Hz power system frequency in ac.
Description : What are the methods of capacitive switching?
Last Answer : • Opening of single capacitor bank • Closing of one capacitor bank against another
Description : Name any two methods of reducing short circuit current/ By providing neutral reactance.
Last Answer : By introducing a large value of shunt reactance between buses.
Description : What are the iterative methods mainly used for solution of load flow study.
Last Answer : The Guass sedal method and Newton Raphson method are the two iterative methods.
Description : What are the methods available for forming bus impedance matrix.
Last Answer : 1. Form the bus impedance matrix and then take its inverse to get bus impedance matrix. 2. Directly form the bus impedance matrix from the reactance diagram. This method utilizes the techniques of modifications of existing bus impedance matrix due to addition of new bus.
Description : What are the methods of starting synchronous motor?
Last Answer : 1. Pony motor starting( using ac or dc motor) 2. Starting as squirrel cage Induction motor or using damper winding 3. Starting as slip ring Induction motor or synchronous motor 4. Using dc machine coupled to it.
Description : What are the methods used to measure the flow?
Last Answer : Mechanical (float) type and ultrasonic type methods are used to measure the flow.
Description : What are the methods of removing moisture from turbine?
Last Answer : a. External method by moisture separator and reheater, which separates the moisture and reheates the steam. b. Internally by stainless steel mesh, which reduces moisture (water particles) to 1%. c. By main steam reheat.
Description : What are the methods to control the speed of singlephase motor?
Last Answer : In AC single-phase motors speed control can not be achieve as smooth as in DC motor. There are following few methods of speed control. a. By changing the number of poles of stator. b. By changing the ... or cascade or tandem method. f. By injecting an emf in the rotor circuit. g. By changing slip.
Description : What are the methods to self-starting of single-phase motor?
Last Answer : a. Splitting one phase into two phases. b. By using capacitor. c. By using repulsion method. d. By shading the poles. e. By connecting the field in series with the rotor having winding with commutator (AC series motor or universal motor).
Description : What are the speed control methods of induction motor?
Last Answer : a. By controlling the supply voltage. b. By controlling the supply frequency (Ns = 120f / P). c. By varying the number of poles (Ns = 120f / P). d. By rotor rheostatic control (for small speed variation).
Description : What are the methods of synchronizing?
Last Answer : a. Lamp method. Dark lamp method and bright lamp method. b. Synchroscope method.
Description : What are the methods of connecting 3-phase windings?
Last Answer : There are two methods. a. Star or wye (Y) connection. b. Delta or mesh connection.
Description : What are the methods of charging of battery.
Last Answer : Mainly there are three types of charging of battery. a. Constant current charging system. In this system the charging current is kept to constant by varying the supplied DC voltage by the help ... value of the trickle charging current is approximately 2% of the full charging current of the battery.
Description : What are the different methods used to measure the resistance?
Last Answer : The different methods developed to measure the resistances are as follows. a. Wheat stone bridge. b. Slide wire bridge. c. Post office box. d. Ohm meter. e. AVO meter or multi meter. f. Bridge megger. g. Megger.