Question

A 60 kW, 400 V d.c. shunt motor has 4 poles a
2-circuit wave-connected armature winding with

450 conductors. The flux per pole is 45 mWb. The full-load
efficiency of the motor is 90.5%. The

armature and interpole windings have a total resistance of 0.1 Ω.
The shunt field resistance is

200 Ω. Calculate (i) the line current (ii) full-load speed and
(iii) armature torque.

Answer #1

B// A 4- pole 220 V, lap wound shunt D.C motor runs at 800 rpm
takes 35 A. The shunt field resistance is 110 Ω and armature
resistance is 0.4 Ω iron and friction losses is 800 W. Find. a-
Maximum efficiency. b- The resistance sections of starter connected
to this motor by using same armature resistance and voltage supply
from above. if maximum armature current is 50 A and the resistance
of first section is 1.95 Ω

Question 2
The full-load armature current of a 5 hp, 150 V shunt dc motor
is 30 A. The field (shunt) resistance and the armature resistance
of the motor are ????F=125 ? and ????????=0.15, respectively. At a
random speed of 1800 rpm magnetization curve of the motor has
measured and is shown in the table below.
EO(V) armature voltage
10
90
110
140
170
185
IF (A) field (shunt) current
0
0.82
1
1.2
1.7
2.88
Calculate the following:
a....

The full-load armature current of a 5 hp, 150 V shunt dc motor
is 30 A. The field (shunt) resistance and the armature resistance
of the motor are ????F = 125 ? and ???????? = 0.15, respectively.
At a random speed of 1800 rpm magnetization curve of the motor has
measured and is shown in the table below. ????0 (V) armature
voltage 10 90 110 140 170 185 ???????? (A) field (shunt) current 0
0.82 1 1.2 1.7 2.88 Calculate...

A 230-V DC shunt motor has armature circuit resistance of 0.25 ?
and field circuit resistance of 115 ?. At
full load armature draws a current of 38 A and the speed is
measured at 1050 rpm. Find the developed
torque.
The field rheostat is now changed so that total field resistance is
144 ?. Find the speed under this condition.
Assume that the armature current does not change. Assuming the
rotational losses amount to 600 W, find the
efficiency...

A 200 V DC, 1,800 RPM shunt connected motor has an armature
resistance of 0.4 ohm and a brush resistance of 0.4 ohm; brush
voltage drop of 6.0 V, independent of load. The resistance of the
shunt field is 230 ohm. The full load rated line current is 40 A.
When the motor is operated at no load the line current is 5 A and
the speed is 1750 RPM.
Calculate speed at rated load
Calculate speed at .3 rated...

A 5-kW, 220-V shunt motor has an armature resistance of 0.15 ?
and a field-circuit resistance of 100 ?. The motor delivers rated
output power at rated voltage when its armature current is 20 A.
When the motor is operating at rated voltage, the speed is observed
to be 1000 r/min when the machine is loaded such that the armature
current is 15 A. In order to protect both the motor and the dc
supply under starting conditions, an external...

A
750V DC shunt motor takes 100A and runs at 3000rpm at full load.
The armature resistance is 1 ohm and the field winding resistance
is 200 ohm. Assume magnetic linearity and flux is directly
proportional to the field current.
Compute its new speed if the developed torque remains the same
after adjusting the field winding resistance to 250 ohm.

1) A DC machine induces an EMF of 240 v at 1500 rpm. Find the
developed torque for an armature current of 25A.
2) Draw and explain all characteristics of d.c. Shunt motor.
3) State accessitivity of 3 point starter.
4) A four pole wave connected dc armature has 50 slots with 10
conductors per slot. The armature is rotated at 1000 rpm of the
useful flux per pole is 30mwb, calculate the amount of EMF
induced.
5) A 6...

A 230 V, 250 rpm, 100 A separately excited dc motor has
an armature resistance of 0.5 Ω. The motor is connected to 230 V dc
supply and rated dc voltage is applied the field winding. It is
driving a load whose torque-speed characteristic is given
by
TL = 500 − 10ω where ω is the speed in rad/sec and TL is
the load torque in N-m. Find
(a) the steady state speed at which the motor will drive
the...

A 75-kW, 440-V, 0.8-PF-leading Y-connected synchronous generator
has an armature resistance of 0.22 Ω and a synchronous reactance of
3.0 Ω. Its efficiency at full load is 89% (1 Hp=746 watt).
(a) What is the line current of the generator at rated
conditions?
(b) What is the internal generated voltage EA of this motor at
rated conditions?

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