4) If the deflecting torque of an instrument is directly proportional to the current to be measured and the maximum current produces a deflection of 90°, compare the deflections in a spring controlled instrument with a similar instrument having gravity control for a current equal to half the maximum value also comment upon the two types of control methods. [Ans. 45°, 30°]

4) If the deflecting torque of an instrument is directly proportional to the current to be measured and the maximum current produces a deflection of 90°, compare the deflections in a spring controlled instrument with a similar instrument having gravity control for a current equal to half the maximum value also comment upon the two types of control methods. [Ans. 45°, 30°]

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...

See similar textbooks

Similar questions

Discuss the operation of non-contact torque measuring instruments
A direct current shunt dynamo continuously supplies an ohmic load of 50 Ohm at terminal voltage Vt= 1000 V. The armature winding resistance is 5 Ohm and the shunt pole winding resistance is 200 Ohm. The sum of mechanical losses is 400 W. What is the percent efficiency of the dynamo under these operating conditions? a) 70 b) 74 c) 87 d) 78 e) 85
Resistance of armature winding. (1) Kilo Ohm Resistance of shunt field winding. Resistance of series field winding. DISCUSSION 1- From the above measurements compare between the values of armature , shunt and series windings.
The OCC is measured by increasing the fieldcurrent in steps from zero to some maximum value, and recording the corresponding values of armature emf. If now the current is decreased from maximum to zero, the emf values will be different; why?
In what type of Power losses does armature circuit, brush-contact, and field circuit losses are considered? a stray losses b armature losses c core losses d copper losses
22 A pressure measurement system is specified as having a non-linearity error of 10.5% of the full-scale reading, a hysteresis error of ±0.5% of the full-scale reading and a repeatability error of ±0.4% of the full-scale reading. What is (a) the overall worst possible error, (b) the overall most likely error? ( 14.
How is hysteresis detected in instruments? illustrate the effect of hysteresis on a instrument? what is an instrument span?
Explain the construction and operation of instrument whose deflecting torque is proportional to the square of operating quantity. Also draw the instrument with labelling.
b- Explain why in the design of the iron cored electrical machines magnetic circuit analysis the magnetic characteristics in the first quadrant is considered, while in that of Permanent Magnet Machines the magnetic characteristics in the second quadrant is considered?
3.3. The current in a conductor on the armature of a DC motor is 300A. The flux under the poles is 850 micro-Weber. The area per pole is 700 mm². The length of the conductor on the armature is 640mm. Calculate the force exerted on the conductor.