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What is the purpose of using a Megger?

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Description : Why using megger ? how to work megger?

Answer : Megger is all about safety. You need to use cables that can meet your demand without putting anyone at risk through earth leakages. So Megger is all about testing cable insulation. You use an insulation tester resistant meter to make sure your cables are standard and properly insulated.

Description : Draw construction of Megger and write operating principle of it.

Answer : Megger:  Working: Two coils the current coil and pressure coil are mounted at an angle on the same spindle and form the part of the moving system. These coils are connected to a small hand driven ... . When the instrument is not working the pointer may rest at any position on the dial.

Description : How do you use a Megger tester?

Description : What is Digital Forensic? A. Process of using scientific knowledge in analysis and presentation of evidence in court B. The application of computer science and investigative procedures for a legal ... technology in the investigation and establishment of the facts or evidence in a court of law

Answer : B. The application of computer science and investigative procedures for a legal purpose involving the analysis of digital evidence after proper search authority, chain of custody, validation with mathematics, use of validated tools, repeatability, reporting, and possible expert presentation

Description : What is the purpose of using flux at the time of soldering? A. To remove oxidation B. To prevent corrosion C. To promote wet surface D. All of these

Answer : What is the purpose of using flux at the time of soldering? A. To remove oxidation B. To prevent corrosion C. To promote wet surface D. All of these

Description : If there are N people in the world and are using secret key encryption/decryption for privacy purpose, then number of secret keys required will be: (A) N (B) (N-1) (C) N(N-1)/2 (D) N(N+1)/2

Answer : (C) N(N-1)/2 

Description : State the purpose of calibration of measuring instruments. Explain the procedure of calibration of D.C. voltmeter by using D.C. potentiometer.

Answer : Purpose of calibration : Calibration is the process of evaluating and adjusting the precision and accuracy of measuring equipment. Proper calibration of an instrument allows people to have a safe ... calibration curve can be drawn by plotting the percentage error against the measured voltages. 

Description : The main purpose of using core in a transformer is to (A) decrease iron losses (B) eliminate magnetic hysteresis (C) reduce reluctance of the common magnetic circuit (D) prevent eddy current loss

Answer : Reduce Relucatnce of the common magnetic circuit.

Description : Megger Practical

Answer : Practical Significance Many a times it is essential to measure insulation resistance of cable before installation as well as whenever power breakdown in a shop or section of industry occurs. The value of ... Note down the reading in observation table. 6. Repeat the steps for other conductors.

Description : Explain with neat sketch the construction and working principle of megger.

Answer : Megger: Construction of Megger : Two coils: the current coil and pressure coil are mounted at an angle on the same spindle and form the part of the moving system. These coils are ... force produces a torque that is used to deflect the pointer of the device which gives some reading.

Description : State any one application of each tool : (i) Earth tester (ii) Megger (iii) Bearing puller (iv) Growler 

Answer : i) Earth Tester :- It is used to measure earth resistance.  ii) Megger :- Megger is used to find out (measure) insulation resistance of electrical machine/equipment.  iii) ... is an electrical device used to find out shorted turn faults in armature winding and stator winding of motor.

Description : Megger is used to measure (a) very high resistance or insulation resistance. (b) low resistance. (c) high resistance. (d) very low resistance. 

Answer : (a)very high resistance or insulation resistance

Description : Megger is used to test _________. A. Insulation B. Current C. Capacitance D. None of these

Answer : Megger is used to test Capacitance.

Description : A megger is basically a/an   (a) Moving iron type instrument (b) Moving coil type instrument (c) Hot wire instrument (d) Electrolytic instrument

Description : A megger is to measure insulation resistance of a cable. The cable should be connected to   (a) Battery (b) DC supply (c) AC supply (d) No supply  

Answer : Battery

Description : To measure insulation resistance of equipments of voltage rating upto 440 V the megger generator must generate   (a) 220 V (b) 440 V (c) 500 V (d) None of these 

Answer : 500 V

Answer : A megger is usually Moving coil type instrument.

Answer : Megger is an instrument used for the measurement of: High resistance and insulation resistance

Description : What are the losses in a transmission line?

Description : What is meant by flash over voltage?

Description : What is dielectric breakdown strength?

Description : What is the difference between line and phase current?

Answer : The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current

Description : What is the lowest acceptable insulation resistance for a cable?

Description : What is dielectric withstand voltage?

Description : What do you mean by insulation coordination?

Description : What does BIL stand for in electrical terms?

Answer : BIL stands for Basic Insulation Level.

Description : What is a safe distance from power lines?

Description : What is the definition of extra low voltage?

Answer : Extra-low voltage (ELV) is an electricity supply voltage in a range which carries a low risk of dangerous electrical shock.

Description : What is the difference between line and phase voltage?

Answer : Line voltage  is  voltage  between two  phases R &Y  (415 v)  while  phase  voltage  is  the  voltage  between  one  phase and  a neutral  B &  N   (240 v).

Description : What is a Ductor tester used for?

Description : What is an insulation resistance test?

Description : What is impulse voltage of transformer?

Description : What is double or reinforced insulation?

Description : What is a switching impulse?

Description : What is Extra High Voltage?

Description : What is the difference between a line voltage and low voltage control system?

Description : What is basic insulation level?

Description : What are the advantages of high voltage transmission?

Answer : Advantages:  1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases ... line increases  12. As transmission voltage increases power handling capacity of transmission line increases 

Description : What is a high voltage test?

Description : What is considered low voltage and high voltage?

Description : What is the use of lightning arrester?

Answer : The lighting arrester is used to discharge the high voltage surge towards the earth by the lighting strike

Description : The breakeven distance for HVDC transmission is (A) 100 kM (B) 250 kM (C) 500 kM – 800 kM (D) Above 1000 kM 

Description : Which of the following is TRUE with respect to HVDC transmission line? (A) For a short distance it is economical over HVAC. (B) In HVDC system, harmonics are not generated. (C) Use of HVDC can improve system stability. (D) Less and cheap terminal, equipments are required in HVDC.

Answer : Which of the following is TRUE with respect to HVDC transmission line? (A) For a short distance it is economical over HVAC. (B) In HVDC system, harmonics are not generated. (C) Use of HVDC can improve system stability. (D) Less and cheap terminal, equipments are required in HVDC.

Description : A Unified Power Flow Controller (FACTS controller) is a voltage source converter based (A) Inter-phase power controller (B) Static Compensator (C) Combination of series and shunt compensators (D) Solid-state series compensator

Answer : A Unified Power Flow Controller (FACTS controller) is a voltage source converter based Combination of series and shunt compensators

Description : In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals

Answer : In voltage source converter based HVDC transmission system the active power is controlled by changing phase angle of the converter ac input voltage

Description : In the case of second order differential equation if the damping ratio is unity, then the poles are  A) Equal, positive and real B) Imaginary and complex conjugate C) Equal, negative and real D) None of the above

Description : The effect of corona in high voltage a.c. transmission line is  A) Increased energy loss in the transmission line B) Increased line reactance C) Increased line to line capacitance D) All of the above 

Description : A bus coupler circuit breaker is utilized in a sub-station for  A) Connecting the transmission line with the bus-bar B) Connecting two power transformers in parallel C) Connecting the bus-bar with ground D) Connecting main and transfer buses in the sub-station

Description : When the communication line run parallel to the power lines in close proximity  P. The electromagnetic effect produces current due to induction resulting its superposition on the speech signal of the communication line causing distortion  Q. The ... ) R only B) P, Q & R C) P & Q only D) P & R only

Description : Due to skin effect  A) Portion of conductor near the outer surface carries less current and the inner core of the conductor carries more current B) Portion of conductor near the outer surface ... Current density near the center of the conductor is maximum and near the surface of the conductor zero

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