Related Questions

A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A remain same
B go down
C improve
D none of the above
The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is
A Higher
B Lower
C Same as long as initial pressure and temperature is unchanged
D None of the above
For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.
A Half
B Twice
C Thrice
D Five times
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when
A Hydrostatic head is required for refluxing the condensate
B Only the function of condensation is to be carried out
C Sub cooling of condensate is desired
D Both the functions of condensation & sub cooling are carried out in a single unit
If partial pressure of air and steam be ‘pa’ and ‘ps’ respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to
A ps - pa
B pa - ps
C pa + ps
D None of these
Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is
A Same
B Less
C About 3 times
D About 0.33 times
Which of the following is the disadvantage of a synchronous condenser ?
A High maintenance cost
B Continuous losses in motor
C Noise
D All of the above
Synchronous Condenser নামক ডিভাইস ব্যাপকভাবে ব্যবহৃত হয় ?
A বিদ্যুৎ উৎপাদনের ক্ষেত্রে
B বিতরণ লাইনে
C সঞ্চালন লাইনে
D টারবাইনের সাথে সংযুক্ত অবস্থায়
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop
A inductor motor torque
B induction generator torque
C synchronous motor torque
D d.c. motor toque
A synchronous motor can be used as a synchronous capacitor when it is
A under-loaded
B over-loaded
C under-excited
D over-excited

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