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Meggar is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another.

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Description :

Write measures to be taken to maintain the insulation resistance of electrical machines to healthy levels.

Description :

Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

Answer :

Following are the methods used to measure resistances:-  (i) Low resistance: 1.Voltmeter-Ammeter Method 2. Kelvin's Double bridge Method  (ii) Medium resistance: 1.Voltmeter-Ammeter Method 2. ... of Charge Method  (iv) Earth resistance : 1. Fall of Potential Method 2. Earth tester

Description :

When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because  (A) Cables have a low value of capacitance which draws a high value of charging current (B) Cables have a low value of initial resistance (C) Cables have a high value of capacitance which draws a high value of charging current (D) Cables have a low value of capacitance and initial resistance

Answer :

When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because Cables have a high value of capacitance which draws a high value of charging current

Description :

kWh meter is the electric meter that measures the amount of electrical _________ in kWh that was consumed in the house.  (A) Energy (B) Current (C) Voltage (D) None of the above

Answer :

kWh meter is the electric meter that measures the amount of electrical Energy in kWh that was consumed in the house. 

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Answer :

Insulation resistance of high voltage circuit breakers is more than 100 mega ohms.

Description :

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

Answer :

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is 1.001 Ω

Description :

What is an insulation resistance test?

Description :

If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be

Answer :

If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be 0.2 mega ohm

Description :

What is the lowest acceptable insulation resistance for a cable?

Description :

An instrument which detects electric current is known as?

Answer :

An instrument which detects electric current is known as galvanometer.

Description :

Write any two factors on which earth resistance depends.

Answer :

Factors on which earth resistance depends: (1) The shape and material used for the electrode (2) Depth of the electrode in the ground. (3) The specific resistance of the soil around the electrode (4) Moisture content in the soil. (5) Nature of soil 

Description :

State the procedure for testing of earth pit resistance with necessary diagrams.

Answer :

Following procedure (Method) for testing of earth pit resistance with necessary diagrams. 1) Earth Tester : i) Three point method ii) Four point method 2) By Potential drop method 3 ... of that earthing pit. In this test the accuracy is less but electrical rods are not required. 

Description :

State function of starter and ELCB. (Earth Leakage Circuit Breaker)

Answer :

i) Function of Starter:- 1. To prevent the high starting current OR to minimize the starting current. 2. To give supply failure protection 3. To give over load and short circuit protection ... an installation and cut off the circuit from power supply and avoid electrical shock to the person.

Description :

Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :  (A) Butt welding and Seam welding  (B) Hydrogen shielding and Projection welding  (C) Seam welding and Coated electrode welding  (D) Coated electrode welding and Hydrogen shielding

Answer :

Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :  (A) Butt welding and Seam welding  (B) Hydrogen shielding and Projection welding  ... Seam welding and Coated electrode welding  (D) Coated electrode welding and Hydrogen shielding

Description :

List three important characteristics of an electric circuit.

Description :

What is the direction of flow of electric current in an electric circuit?

Answer :

It  flows  from  anode  to  cathode  (direction  of   holes  flow)

Description :

Compare electric and magnetic circuit.

Answer :

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Description :

Draw a typical electric circuit including ammeter and voltmeter.

Answer :

The figure shows typical electric circuit including ammeter and voltmeter. Ammeter is connected in series for measurement of current. Voltmeter is connected in parallel for measurement of voltage. Fuse is use ... are used. If the electric supply is DC the DC ammeter and DC voltmeter are used.

Description :

State Ohm’s law for electric circuit.

Answer :

Ohms law -States that the current flows in a circuit is directly proportional to the applied voltage (V) and inversely the proportional resistance provided with the temperature main constant

Description :

Electric current passing through the circuit produces?

Answer :

Electric current passing through the circuit produces thermal effect.

Description :

A star circuit has element of resistance R/2. The equivalent delta elements will be?

Description :

The resistance of a few meters of wire conductor in closed electrical circuit is?

Answer :

The resistance of a few meters of wire conductor in closed electrical circuit is practically zero.

Description :

Answer :

A moving-coil permanent-magnet instrument can be used as ammeter by using a low resistance shunt.

Description :

Answer :

A differential relay measures the vector difference between two or more similar electrical quantities.

Description :

A Pyrheliometer is an instrument to measure :  (A) temperature of solar photovoltaic cell  (B) intensity of direct solar radiation at normal incidence  (C) intensity of indirect solar radiation  (D) efficiency of a solar photovoltaic cell

Answer :

A Pyrheliometer is an instrument to measure : intensity of direct solar radiation at normal incidence 

Description :

Answer :

In a Schering bridge the potential of the detector above earth potential is a few volts only.

Description :

Answer :

If an instrument has cramped scale for larger values, then it follows logarithmic law.

Description :

Answer :

The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

Description :

Answer :

The pointer of an indicating instrument should be very light.

Description :

Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Answer :

Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

Description :

Answer :

The gravity controlled instrument has crowded scale because current is proportional to sine of deflection angle.

Description :

The ratio of maximum displacement deviation to full scale deviation of the instrument is called?

Answer :

The ratio of maximum displacement deviation to full scale deviation of the instrument is called linearity.

Description :

The thickness of insulation provided on the conductor depends on?

Answer :

The thickness of insulation provided on the conductor depends on the magnitude of voltage on the conductor.

Description :

The insulation on a current carrying conductor is provided?

Answer :

The insulation on a current carrying conductor is provided to prevent leakage of current, to prevent shock.

Description :

What do you mean by insulation coordination?

Description :

What is double or reinforced insulation?

Description :

What is basic insulation level?

Description :

In a PMMC instrument, the damping provided is :  (A) air damping (C) eddy current damping (B) fluid damping (D) magnetic damping using a magnet

Answer :

In a PMMC instrument, the damping provided is : eddy current damping 

Description :

Eddy current damping cannot be used for moving iron instrument because

Answer :

Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

Description :

Identify the instrument that does not exist (A) Dynamo-meter type ammeter (B) Dynamo-meter type wattmeter (C) Moving-iron voltmeter (D) Moving-iron wattmeter

Answer :

Identify the instrument that does not exist (A) Dynamo-meter type ammeter (B) Dynamo-meter type wattmeter (C) Moving-iron voltmeter (D) Moving-iron wattmeter

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Answer :

Instrument transformers are potential transformers, current transformers.

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Answer :

The rectifier instrument is not free from frequency error.

Description :

Answer :

A multirange instrument has multiple shunt or series resistances inside the meter.

Description :

Answer :

The scale of a rectifier instrument is linear.

Description :

Answer :

A moving iron instrument can be used for both D.C. and A.C.

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In a portable instrument, the controlling torque is provided by spring.

Description :

Answer :

A moving-coil permanent-magnet instrument can be used as flux-meter by eliminating the control springs.

Description :

What is the definition of a primary instrument?

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Answer :

u can assume the direction of current either in clockwise or anticlockwise...but the solution will remain same in both cases

Description :

An a.c series circuit has resistance of 10ohm, inductance of 0.1H and capacitance of 10µf, voltage applied to circuit is 200V. find (i) Resonant frequency (ii) Current at resonance (iii) Power at resonance 

Answer :

Solution: For RLC series circuit

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