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(b) start but not run at synchronous speed A cylindrical rotor synchronous motor is switched on to the dc supply with its field windings shorted on themselves. What is the excitation emf of the motor?ДЈ6. A synchronous motor is operated from a bus voltage of 1.0 pu and is drawing 1.0 pu zero power factor leading current. (c) By changing the direction of rotationДЈ5.

#Diploma 6 test generator generator#

How can the reactive power delivered by a synchronous generator be controlled? (d) the number of poles is doubled without reversing the field currentДЈ4. (c) the field current is reversed and the number of poles is doubled (b) the field current remains the same but the direction of rotation is reversed

(a) the field current is reversed keeping the direction of rotation same The phase sequence of a three-phase alternator will reverse if Which three-phase connection can be used in a transformer to introduce a phase difference of 30В° between its output and corresponding input line voltages?ДЈ3.

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For this transformer at full load the cooper lossДЈ2. The efficiency of a 100 KVA transformer is 0.98 at full as well as half load. The inductive reactance of a transformer depends onДЈ1.

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An electric train employing a dc series motor is running at a fixed speed, when a sudden slight drop in the mains voltage occurs. A 4 pole generator with 16 coils has a two layer winding. In a speed control system, output rate feedback is used toДў8. (d) increases the influence of variations of component parameters on the system performance More Question Set on Electrical Engineering Diploma MCQs from Various Exam Model QuestionДў6. (c) reduces the effects of disturbance and noise signals in the forward path In control system, the use of negative feedback A single phase transmission line of impedance 0.8 ohm supplies a resistive load of 500 A at 300 V. Which of the following type of motor is not self starting?Дў4. If the efficiency of the motor is 95%, the developed power will beДў3. A synchronous motor draws 2000KVA at a power factor of 90% leading. If the field of synchronous motor is under excited, power factor will beДў2. (b) Interchanging armature and field connectionДў1. If the gain of an open loop system is doubled, the gain marginДў0. The steady state error to unit step input when operated as a unity feedback system isДЎ9. The transfer function of a system is 10/(1+s). As the load factor of a power plant increases, the cost per KWh of the energy generatedДЎ8. Bulk power transmission over very long HVDC lines are preferred on account ofДЎ7. (c) current carrying capacity of the lineДЎ6. Which type of plant has the minimum running cost per Kwh of energy generated?ДЎ5.

shunt motors can be reversed by interchangingДЎ1. The stator winding of a single-phase induction motor is split into two parts in order toДЎ0. Which of the following motors is used in household refrigerator?Д©. Which motor can conveniently operate at lagging as well as leading power factor?ДЁ. (c) it will not be able to develop any torqueД§. (b) it will run at an excessively high speed (a) it will draw a very high current from the supply

series motor should always be started with some load on its shaft, because otherwise Distribution transformers preferably should beДҐ. The regulation of a transformer is negative when the load isДЈ. (c) both hysteresis and eddy current lossДў. Transformer cores are laminated to reduce Diploma Electrical Engineering Important QuestionsДЎ.

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