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Expire on 07 Jan 2024
Week # 2 Quiz 2
The mechanical angle is________electrical angle.
greaterthan or equal to
lesser than or equal to
A three phase alternator having synchronous reactance 0.2 \(\Omega\) is rated as 100 MVA, 11 kV. Calculate the base current and base impedance.
9.09 kA and 1.31 \(\Omega\)
5.25 kA and 1.21 \(\Omega\)
9.09 kA and 1.13 \(\Omega\)
5.25 kA and 1.12 \(\Omega\)
In a synchronous motor if the back emf generated in the armature at no load is approximately equal to the applied voltage, then
the torque generated is maximum
the excitation is said to be 100%
the excitation is said to be zero percent
the motor is said to be fully loaded.
If the full-load copper loss of a transformer is 800 W, then the copper loss at half-load is__________.
If the transformer is applied rated supply voltage with double frequency, then it's hysteresis losses will be
Increased by double than rated
Reduced to half than rated
Increased by four times than
What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA?
which of the following will not prevent a self excited generator from building up to its full voltage?
wrong direction of rotation
no residual magnetism
speed to high
A star connected synchronous generator rated at 500 MVA, 50 kV has a reactance of 0.5 pu. Find the ohmic value of the reactance.
The type of DC generator suitable for battery charging in automobiles is
DC differentially compound
DC cummulative compound
A 3\(\phi\)- 4 pole induction motor is supplied from 3-\(\phi\) 50 Hz AC supply. Find the rotor frequency when it runs at 600 RPM.
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