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QUIZ - 2
Ratio of X
_{d}
/X
_{q}
for cylindrical alternator is ------- X
_{d}
/X
_{q}
of salient pole machine
greater than
less than
Equal to
None of the above
Steady state direct axis reactance is ---------- transient direct axis reactane
greater than
less than
Equal to
None of the above
In an hydro alternator, if X
_{d}
=1.15 then the value of Xq will be approximately
1.75
15
0.75
0.075
In Salient pole alternator the rotor diameter is -------- its length
greater than
lesser than
Equal to
None of the above
While conducting slip test, the synchronous machine runs at a slip ‘s’ and stator supply frequency ‘f’, the frequency of
voltage induced across open field terminals
envelope of the armature terminal voltage
envelope of the armature current, and
armature current
will be respectively
sf, sf,sf and f,
sf, f, sf and f
f, sf, f and sf
f, (1-s)f,(2-s)f and sf
When a synchronous motor is running at synchronous speed, the damper winding produces
Damping toruqe
Eddy current torque
Driving torque
No torque
The reactance of any machine is ------------- proportional to relucatance of flux path and ---------- proportional to square of number of turns
inversely, directly
directly, inversely
directly, directly
inversly, inversly
The armature reactance of salient pole synchronous machine
is equal to X
_{d}
is equal to X
_{q}
varies between X
_{d}
and X
_{q}
none of the above
The ratio of X
_{d}
to X
_{q}
in salent pole machine varies in the range
0.66 to 0.7
0.3 to 0.0.5
0.9 to 1.0
1.0 to 1.5
By which test synchronous machine can be recognised as cylindrical or salient pole type?
Slip Test
Static Test
Open circuit Test
Short circuit Test
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