Concentrated winding differ from distributed winding with the concern of _________
a) identical magnetic axis
b) two magnetic axis
c) no magnetic axis
d) physical spacing
Q.2.
DC machines have ________ windings and synchronous machines use ______ windings.
a) closed,open
b) open, closed
c) open, open
d) closed, closed
Q.3.
We can place closed windings in _________
a) ac commutator machine
b) stepper motor
c) ac machine
d) dc machine
Q.4.
Which of the following machines can be used to place open slot winding?
a) ac machine
b) ac commutator machine, ac machine
c) dc machines
d) all of the mentioned
Q.5.
The simplex lap winding has the range of winding pitch of _________
a) (-2,2)
b) (-1,1)
c) more than 2
d) less than 1
Q.6.
The commutator pitch for a simplex lap winding is equal to _________
a) 1 and -1
b) 1
c) -1
d) 2 to -2
Q.7.
Adc machine has 4 poles andcoils, having simplex lap winding. The number of commutator segments which required in the given machine will be?
a) 40
b) 20
c) 80
d) 26
Q.8.
Commutator segments in a DC shunt machine is equal to the number of _________
a) coil sides
b) turns
c) coils
d) slots
Q.9.
We can employ dummy coils in a DC machine to _________
a) compensate reactance voltage
b) reduce armature reaction
c) provide mechanical balance to the armature
d) improve the waveforms generated inside the commutator
Q.10.
In AC machines we should prefer double layer winding over single layer windings because _________
a) it requires identical coils
b) it is economical to use
c) it offers lower leakage reactance
d) all of the mentioned
Q.11.
For an electrical machine with C number of coils and P poles, the distance between the coils connected by an equalizer ring is?
a) C/P
b) C/2
c) 2C/P
d) C/2P
Q.12.
With a P-pole DC machine with armature current Ia, the current per brush arm for a lap connected windings is?
a) Ia/P
b) Ia/2P
c) 2Ia/P
d) Ia/4P
Q.13.
For a given dc machine it is advised to use the dummy windings for a stable operation. But if it has be replaced as it unused component in the machine, then we must _________
a) S/P/2 should not be an integer
b) S/P/2 should be integer
c) S/P should be integer
d) S/P should not be an integer
Q.14.
While doing regular checks on the dc machine with the lap connected winding, it is reported to have ammeter fluctuations, this can be due to _________
a) different air gaps under poles
b) variable reluctances in the core
c) irregular design deformations
d) all of the mentioned
Q.15.
A 6-pole lap wound DC generator has a developed power of P watts and brush voltage of E volts. Three adjacent brushes of the machine had been found worn out and got open circuited. If the machine is operated with the remaining brushes, voltage and power that could be obtained from the machine are _________
a) E, P
b) E, 2P/3
c) E/P, 2P/3
d) E, P/3
Q.16.
Consider a dc machine having its armature wound in lap fashion havingcoils and each resistance 0.1 ohms. If it is measured resistance between two adjacent commutator segments, the result will be _________
a) 0.092 ohms
b) 1.1 ohms
c) 1.8 ohms
d) 0.92 ohms
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