Fill in the blank: 1- Lap winding is suitable for --- -current, --voltage d.c. generators. 2-A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torque produced when the armature current is 20 A, is -----N-m. 3- The d.c. series motor should never be switched on at no-load because 4- The equation relating the generated c.m.f., E, terminal voltage, armature current and armature resistance for a d.c. motor is E=
Fill in the blank: 1- Lap winding is suitable for --- -current, --voltage d.c. generators. 2-A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torque produced when the armature current is 20 A, is -----N-m. 3- The d.c. series motor should never be switched on at no-load because 4- The equation relating the generated c.m.f., E, terminal voltage, armature current and armature resistance for a d.c. motor is E=
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter33: Single-phase Motors
Section: Chapter Questions
Problem 32RQ
Related questions
Question
![Fill in the blank:
1- Lap winding is suitable for
current,
voltage d.c. generators.
2- A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torque
produced when the armature current is 20 A, is --------- N-m.
3- The d.c. series motor should never be switched on at no-load because
4- The equation relating the generated c.m.f., E, terminal voltage, armature current and
armature resistance for a d.c. motor is E =
5- A transformer having 1000 primary turns is connected to a 250 V a.c. supply. For a
secondary voltage of 400 V, the number of secondary turns should be turns.
6- The equivalent resistance of the primary of a transformer having N2/N1 = 5 and R1 = 0.1
ohm when referred to secondary becomes
ohm..05
7- The maximum efficiency of a 100 kVA transformer having iron loss of 900 W and F.L.
cu loss of 1600 W occurs at -
------
KVA.
650KVA
8- If Cu loss of a transformer at 7/8 full load is 4900 W, then its full-load Cu loss would be
---- watt.
‒‒‒‒‒‒‒](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F12022ac5-1521-4ae4-9c1e-bc3fe7b48df8%2F298cbc65-0602-4549-af57-83d99299d2aa%2F0d2frc_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Fill in the blank:
1- Lap winding is suitable for
current,
voltage d.c. generators.
2- A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torque
produced when the armature current is 20 A, is --------- N-m.
3- The d.c. series motor should never be switched on at no-load because
4- The equation relating the generated c.m.f., E, terminal voltage, armature current and
armature resistance for a d.c. motor is E =
5- A transformer having 1000 primary turns is connected to a 250 V a.c. supply. For a
secondary voltage of 400 V, the number of secondary turns should be turns.
6- The equivalent resistance of the primary of a transformer having N2/N1 = 5 and R1 = 0.1
ohm when referred to secondary becomes
ohm..05
7- The maximum efficiency of a 100 kVA transformer having iron loss of 900 W and F.L.
cu loss of 1600 W occurs at -
------
KVA.
650KVA
8- If Cu loss of a transformer at 7/8 full load is 4900 W, then its full-load Cu loss would be
---- watt.
‒‒‒‒‒‒‒
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