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A cable is tested by loss of charge method using a ballistic galvanometer with following results:
Discharged immediately after electrification, deflection 200 divisions.
Discharged after 20s and after electrification:
(i) deflection, 100 divisions,
(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.
What is the insulation resistance of the cable?
Discharged immediately after electrification, deflection 200 divisions.
Discharged after 20s and after electrification:
(i) deflection, 100 divisions,
(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.
What is the insulation resistance of the cable?
- a)20 MΩ
- b)30 MΩ
- c)40 MΩ
- d)10 MΩ
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
A cable is tested by loss of charge method using a ballistic galvanome...
Let R be the insulation resistance of the cable and R' be the equivalent resistance of the parallel combination of insulation resistance R and 10 MΩ resistance.
Dividing equation (1) by (2), we get:
Dividing equation (1) by (2), we get:
Most Upvoted Answer
A cable is tested by loss of charge method using a ballistic galvanome...
To find the insulation resistance of the cable, we can use the formula:
Insulation Resistance = (Deflection with resistance - Deflection without resistance) * Resistance
Given:
Deflection without resistance (i.e., immediately after electrification) = 200 divisions
Deflection with resistance (i.e., after 20s) = 100 divisions
Deflection with resistance (i.e., when in parallel with a resistance of 10 MW) = 50 divisions
Resistance = 10 MW = 10^7 Ω
Using the formula, the insulation resistance can be calculated as follows:
Insulation Resistance = (100 - 200) * 10^7 = -100 * 10^7 = -10^9 Ω
However, the insulation resistance cannot be negative. Therefore, the given values and calculations seem to have an error. Please reconfirm the given data or provide additional information to correct the calculations.
Insulation Resistance = (Deflection with resistance - Deflection without resistance) * Resistance
Given:
Deflection without resistance (i.e., immediately after electrification) = 200 divisions
Deflection with resistance (i.e., after 20s) = 100 divisions
Deflection with resistance (i.e., when in parallel with a resistance of 10 MW) = 50 divisions
Resistance = 10 MW = 10^7 Ω
Using the formula, the insulation resistance can be calculated as follows:
Insulation Resistance = (100 - 200) * 10^7 = -100 * 10^7 = -10^9 Ω
However, the insulation resistance cannot be negative. Therefore, the given values and calculations seem to have an error. Please reconfirm the given data or provide additional information to correct the calculations.
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A cable is tested by loss of charge method using a ballistic galvanometer with following results:Discharged immediately after electrification, deflection 200 divisions.Discharged after 20s and after electrification:(i) deflection, 100 divisions,(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.What is the insulation resistance of the cable?a)20 MΩb)30 MΩc)40 MΩd)10 MΩCorrect answer is option 'D'. Can you explain this answer?
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A cable is tested by loss of charge method using a ballistic galvanometer with following results:Discharged immediately after electrification, deflection 200 divisions.Discharged after 20s and after electrification:(i) deflection, 100 divisions,(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.What is the insulation resistance of the cable?a)20 MΩb)30 MΩc)40 MΩd)10 MΩCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A cable is tested by loss of charge method using a ballistic galvanometer with following results:Discharged immediately after electrification, deflection 200 divisions.Discharged after 20s and after electrification:(i) deflection, 100 divisions,(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.What is the insulation resistance of the cable?a)20 MΩb)30 MΩc)40 MΩd)10 MΩCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A cable is tested by loss of charge method using a ballistic galvanometer with following results:Discharged immediately after electrification, deflection 200 divisions.Discharged after 20s and after electrification:(i) deflection, 100 divisions,(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.What is the insulation resistance of the cable?a)20 MΩb)30 MΩc)40 MΩd)10 MΩCorrect answer is option 'D'. Can you explain this answer?.
A cable is tested by loss of charge method using a ballistic galvanometer with following results:Discharged immediately after electrification, deflection 200 divisions.Discharged after 20s and after electrification:(i) deflection, 100 divisions,(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.What is the insulation resistance of the cable?a)20 MΩb)30 MΩc)40 MΩd)10 MΩCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A cable is tested by loss of charge method using a ballistic galvanometer with following results:Discharged immediately after electrification, deflection 200 divisions.Discharged after 20s and after electrification:(i) deflection, 100 divisions,(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.What is the insulation resistance of the cable?a)20 MΩb)30 MΩc)40 MΩd)10 MΩCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A cable is tested by loss of charge method using a ballistic galvanometer with following results:Discharged immediately after electrification, deflection 200 divisions.Discharged after 20s and after electrification:(i) deflection, 100 divisions,(ii) when in parallel with a resistance of 10 MW, deflection 50 divisions.What is the insulation resistance of the cable?a)20 MΩb)30 MΩc)40 MΩd)10 MΩCorrect answer is option 'D'. Can you explain this answer?.
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