1.A cumulative compound motor is operated as a shunt motor with its series field disconnected, has an...
Question:
1.A cumulative compound motor is operated as a shunt motor with its series field disconnected, has an armature current of 100 A and at a shunt field flux of 0.09 Wb develops a torque of 75 N.m. When the series field is connected at the same armature current, the motor develops a torque of 90 N.m. Calculate the increase in flux produced by the series field. *
a.22 mWb
b.18 mWb
c.25 mWb
d.20 mWb
2.A 250 kVA transformer has a full load copper loss of 3 kW and an iron loss of 2 kW. Calculate the maximum efficiency, assuming the power factor of the load is 0.80.
a.98.45%
b.96.48%
c.97.61%
d.95.78%
3.A shunt generator has a field resistance of 60 Ω. When the generator delivers 6 kW, the terminal voltage is 120 V, while the generated EMF is 133 V. Determine: The generated EMF when the output is 2 kW at terminal voltage of 135 V. *
a.145.36 v
b.142.64 v
c.139.26 v
d.140.68 v
Managerial Accounting Tools for business decision making
ISBN: 978-1118096895
6th Edition
Authors: Jerry J. Weygandt, Paul D. Kimmel, Donald E. Kieso