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
Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its
A Six ground stations
B Five ground stations
C Four ground stations
D Three ground stations
As the height of a satellite orbit gets lower, the speed of the satellite ___________.
A Increases
B Decreases
C Remains the same
D None of the above
For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is:
A Circular orbit
B Sun-synchronous orbit
C Near polar orbit
D None of these
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
A synchronous motor can develop synchronous torque
A when under loaded
B while over-excited
C only at synchronous speed
D below or above synchronous speed
m ভরের একটি উপগ্রহ R ব্যাসার্ধের একটি বৃত্তাকার কক্ষপথে M ভরের একটি গ্রহকে প্রদক্ষিণ করে। একটি পূর্ণ ঘূর্ণনের জন্য প্রয়োজনীয় সময় নিচের কোনটির সমানুপাতিক? (A satellite of mass m orbits a planet of mass M in a circular orbit of radius R. The time required for one complete revolution is proportional to which of the following?)
A M
B R3/2
C R2
A satellite moves in its orbit around the earth due to
A Gravitational force
B Centripetal force
C Centrifugal force
D None of these
A satellite goes on moving along its orbit round the earth due to
A Gravitational force
B Centrifugal force
C Centripetal force
D None of these

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