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 torqueproduced when the armature current is 20 A, isN-m.3- The d.c. series motor should never be switched on at no-load because4- The equation relating the generated e.m.f., E, terminal voltage, armature current andarmature 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 asecondary voltage of 400 V, the number of secondary turns should beturns.6- The equivalent resistance of the primary of a transformer having N2/N1 = 5 and R1 = 0.1ohm when referred to secondary becomesohm.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.‒‒‒‒‒‒‒‒‒‒‒‒‒8- If Cu loss of a transformer at 7/8 full load is 4900 W, then its full-load Cu loss would bewatt.

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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 N-m. produced when the armature current is 20 A, is --------- 3- The d.c. series motor should never be switched on at no-load because 4- The equation relating the generated e.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 N-m. produced when the armature current is 20 A, is --------- 3- The d.c. series motor should never be switched on at no-load because 4- The equation relating the generated e.m.f., E, terminal voltage, armature current and armature resistance for a d.c. motor is E = ‒‒‒‒‒‒‒‒ ‒‒‒‒‒‒‒‒‒‒

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

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 e.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.
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.
‒‒‒‒‒‒
‒‒‒‒‒‒‒
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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