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1. The coil of a PMMC voltmeter is 40 mm Jong and 20 mm wide and has 120 turns on The control spring exerts a torque of 90 - 10-6 N - m when the deflection in 100 divisions on full scale deflection. If the flux density of the magnetic field in the air gap 0.4 Wb/m, determine the resistance required to be connected in series with the con o give one volt per division. Assume the resistance of the coil to be 1.5 kfl. 2. Two lamps LI =50 Q and L2= 100 n are connected in series with a 110V DC source. Find the error in the measure power in L1 using voltmeter -ammeter method and in ideal real conditions, given that the internal resistance of voltmeter is 120 k2 and that of the ammeter is 0.2 m2, when (a) voltmeter is connected near L2 than the ammeter and (b) the ammeter is connected near L2 than the voltmeter. 3. With the aid of illustrations and suitable expressions, explain how ammeters and voltmeter can have their range extended.

1. The coil of a PMMC voltmeter is 40 mm Jong and 20 mm wide and has 120 turns on The control spring exerts a torque of 90 - 10-6 N - m when the deflection in 100 divisions on full scale deflection. If the flux density of the magnetic field in the air gap 0.4 Wb/m, determine the resistance required to be connected in series with the con o give one volt per division. Assume the resistance of the coil to be 1.5 kfl. 2. Two lamps LI =50 Q and L2= 100 n are connected in series with a 110V DC source. Find the error in the measure power in L1 using voltmeter -ammeter method and in ideal real conditions, given that the internal resistance of voltmeter is 120 k2 and that of the ammeter is 0.2 m2, when (a) voltmeter is connected near L2 than the ammeter and (b) the ammeter is connected near L2 than the voltmeter. 3. With the aid of illustrations and suitable expressions, explain how ammeters and voltmeter can have their range extended.

Introductory Circuit Analysis (13th Edition)
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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Question 1 1. The coil of a PMMC voltmeter is 40 mm Jong and 20 mm wide and has 120 turns on t The control spring exerts a torque of 90- 10-6 N - m when the deflection in 100 divisions on full scale deflection. If the flux density of the magnetic field in the air gap is 0.4 Wb/m', determine the resistance required to be connected in series with the coil to give one volt per division. Assume the resistance of the coil to be 1.5 kfl. 2. Two lamps LI =50 2 and L2= 100 2 are connected in series with a 110V DC source Find the error in the measure power in L1 using voltmeter -ammeter method and in ideal real conditions, given that the internal resistance of voltmeter is 120 k2 and that of the ammeter is 0.2 m2, when (a) voltmeter is connected near L2 than the ammeter and (b) the ammeter is connected near L2 than the voltmeter. 3. With the aid of illustrations and suitable expressions, explain how ammeters and voltmeter can have their range extended. Question 2 1. A set of physical length measurements were taken and results are as follows: 1.45, 1.44, 1.57,1.48, 1.43, 1:46,1.54,1.49,1.41,1.60 m. Assuming that only random errors are present, Calculate Arithmetic mean, average deviation, standard deviation and variance. 2. In a balanced 3 phase circuit power is measured by two wattmeter method. If the ratio of the two meter readings is 3:1.5, determine the power factor of the connected load. 3. Explain the main difference among indicating, recording, integrated and null detector instruments Question 3 1. A ring core current transformer of ration 1000/5 A is operating at full primary current with the secondary burden of non-inductive resistance of 1.1 2. It's exciting current is 1A at a power factor of 0.45. Caleulate: the ratio error at full load, assuming that there has been no compensation, and the phase angle. 2. A load takes a current of 2.6 A, a non-inductive resistor connected in parallel take 2.4A when connected across a22 V supply. If the total current take from the supply is 4.6 in the three wattmeter method of single-phase AC power measurement circuit, calculate the power consumed by the load, load impedance and load power factor. 3. With an illustration explain the operation of PLCS and state their main advantages over hard wired relays.
Transcribed Image Text:Question 1 1. The coil of a PMMC voltmeter is 40 mm Jong and 20 mm wide and has 120 turns on t The control spring exerts a torque of 90- 10-6 N - m when the deflection in 100 divisions on full scale deflection. If the flux density of the magnetic field in the air gap is 0.4 Wb/m', determine the resistance required to be connected in series with the coil to give one volt per division. Assume the resistance of the coil to be 1.5 kfl. 2. Two lamps LI =50 2 and L2= 100 2 are connected in series with a 110V DC source Find the error in the measure power in L1 using voltmeter -ammeter method and in ideal real conditions, given that the internal resistance of voltmeter is 120 k2 and that of the ammeter is 0.2 m2, when (a) voltmeter is connected near L2 than the ammeter and (b) the ammeter is connected near L2 than the voltmeter. 3. With the aid of illustrations and suitable expressions, explain how ammeters and voltmeter can have their range extended. Question 2 1. A set of physical length measurements were taken and results are as follows: 1.45, 1.44, 1.57,1.48, 1.43, 1:46,1.54,1.49,1.41,1.60 m. Assuming that only random errors are present, Calculate Arithmetic mean, average deviation, standard deviation and variance. 2. In a balanced 3 phase circuit power is measured by two wattmeter method. If the ratio of the two meter readings is 3:1.5, determine the power factor of the connected load. 3. Explain the main difference among indicating, recording, integrated and null detector instruments Question 3 1. A ring core current transformer of ration 1000/5 A is operating at full primary current with the secondary burden of non-inductive resistance of 1.1 2. It's exciting current is 1A at a power factor of 0.45. Caleulate: the ratio error at full load, assuming that there has been no compensation, and the phase angle. 2. A load takes a current of 2.6 A, a non-inductive resistor connected in parallel take 2.4A when connected across a22 V supply. If the total current take from the supply is 4.6 in the three wattmeter method of single-phase AC power measurement circuit, calculate the power consumed by the load, load impedance and load power factor. 3. With an illustration explain the operation of PLCS and state their main advantages over hard wired relays.
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