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Basically a potentiometer is a device for comparing two voltages.

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Answer :

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

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Description :

Answer :

A potentiometer may be used for measurement of resistance, measurement of current, calibration of ammeter, calibration of voltmeter.

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Description :

When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, the voltmeter reading shows 0.99 V. If the resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is (A) 150 (B) 100 (C) 50 (D) 200

Answer :

When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, ... resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is 100

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Description :

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken?

Answer :

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken from the same source as the unknown voltage.

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149 views 1 answer
Description :

Answer :

In order to achieve high accuracy, the slide wire of a potentiometer should be as long as possible.

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162 views 1 answer
Description :

Answer :

To measure a resistance with the help of a potentiometer it is not necessary to standardise the potentiometer.

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Description :

Answer :

In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be out of phase by 90°.

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65 views 1 answer
Description :

Answer :

Yes we can use potentiometer for measuring resistance.

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66 views 1 answer
Description :

A rheostat differs from potentiometer in the respect that it?

Answer :

A rheostat differs from potentiometer in the respect that it has higher wattage rating.

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Answer :

Wagner earthing device is used to eliminate errors due to electrostatic coupling.

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Answer :

A damping device prevents the oscillation of the moving system and enables the latter to reach its final position quickly.

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Description :

 Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

Answer :

 Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

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Answer :

A switchgear is device used for switching, controlling and protecting the electrical circuit and equipment.

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Description :

Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna

Answer :

Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna 

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Description :

A snubber circuit is connected to the power semiconductor device to reduce the (A) turn-on time (B) turn-off time (C) electrical stresses (D) thermal resistance

Answer :

A snubber circuit is connected to the power semiconductor device to reduce the electrical stresses

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Is FPGA a volatile device?

Answer :

Yes, FPGA is a volatile device.

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Description :

Answer :

No, BJT is a current controlled device .

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Description :

State any four materials used in fabrication of semiconductor device and describe its need.

Answer :

For fabrication of semiconductor devices like transistors diode, solar cell etc. we have to make use of following types of materials  1. Substrate: o It is used for deposition of thin ... . o Metal cans and sealed glass containers satisfy the extreme requirements of space and military users.

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Description :

Linear and non-linear device

Answer :

Linear and non-linear device

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Description :

Why transistor is called as bipolar device.

Answer :

BJT is called bipolar device because in BJT current conduction takes place due to majority as well as minority charge carriers that is because of electrons as well as holes.

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57 views 1 answer
Description :

The device which allows reverse power flow and withstands highest switch frequency is (A) GTO (B) MOSFET (C) IGBT (D) Inverter grade SCR

Answer :

The device which allows reverse power flow and withstands highest switch frequency is MOSFET

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Description :

What is an example of an analog device?

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Description :

Answer :

No, IGBT is not the current controlled device. IGBT is a voltage controlled device. IGBT have combine qualities of MOSFET and BJT. The high switching speed of MOSFET and low conduction losses of BJT. Also, IGBT which stands for Insulated Gate Bipolar Transistor have high input impedance.

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Description :

Answer :

Thyristor can only be turned on by small gate pulse but it cannot be turn off by using gate hence thyristor is called semi controlled device.

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Description :

Answer :

Thyristor can be turn on by positive gate pulse and the current will continue to flow through the device even when the gate voltage is low hence thyristor is called latching device.

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Description :

Answer :

already answered here is mosfet current controlled device?

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Description :

Answer :

MOSFET  are voltage controlled devices.

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Description :

Answer :

BJT is current controlled device.

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Description :

A d.c. potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18V obtains balance at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf0fthe test cell is  A)1.00V B)1.34V C)1.50V D)1.70V 

Answer :

A d.c. potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18V obtains balance at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf0fthe test cell is 1.34V

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Answer :

Potentiometer sensitivity can be increased by Increasing the length of potentiometer wire.

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A Ohmmeter is basically: A ammeter

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It is required to measure the true open circuit e.m.f. of a battery. The best device is D.C. potentiometer.

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Which instrument is used for photographing the Sun? (1) Galvanometer (2) Potentiometer (3) Spectrophotometer (4) Spectroheliograph

Answer :

Spectroheliograph

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The component used for tuning a radio is basically a variable (1) Resistor (2) Condenser (3) Inductor (4) Transformer

Answer :

Condenser

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Faucet A basically used as inlet pipe and Faucet B is used as outlet pipe. Faucet A and B both are opened simultaneously, all the time. When Faucet A fills the tank and Faucet B empty the tank, it will take thrice the time than when both the pipes fill the tank. When Faucet B is used for filling the tank, its efficiency remains constant. What is the ratio of efficiency of Faucet A and Faucet B respectively? a) 1:2 b) 2:1 c) 1:3 d) 3:1

Answer :

B Efficiency when both pipes used to fill = A + B And efficiency when Faucet A is used to fill and Faucet B is used to empty the tank = A-B So (A+B)/(A-B)=3/1 A/B+1/(A/B-1)=3/1 A/B+1=3(A/B-1) 3A/B-A/B=4 2A/B=4 A/B=2 Thus, the ratio of efficiency of Faucet A and B =2:1

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Answer :

Inductance coils are basically designed for High Q.

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Description :

What is the number of turns of wire needed to provide a potentiometer with a resolution of 0.05 percent ? (a) 200 turns (b) 2000 turns (c) 20 turns (d) 20000 turns

Answer :

B) 2000 turns

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Description :

A resistance potentiometer is a : -  a) first order instrument b) zero order instrument c) second order instrument d) none of the above

Answer :

A resistance potentiometer is a : - zero order instrument

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142 views 1 answer
Description :

The resolution of a potentiometer should be:  (1) Zero (2) Low (3) High (4) Infinite

Answer :

The resolution of a potentiometer should be: Infinite.

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263 views 1 answer
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. 

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Description :

Explain the principle of potentiometer.

Answer :

Principle and explanation The fall of potential is directly proportional to the length of conducting wire. The potential difference between two points of conductive wire is directly proportional to the length/distance between the two points.

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Description :

HTML is basically used to design: (A) Web-page (B) Web-site (C) Graphics (D) Tables and Frames

Answer :

(A) Web-page

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Description :

The ‘Choke’ used with a tube light is basically (1) an inductor (2) a capacitor (3) a transformer (4) a resistor

Answer :

an inductor

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Magnifying Glass is basically a (1) Plano-concave lens (2) Concave lens (3) Convex lens (4) Cylindrical lens

Answer :

 Convex lens

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TWT is basically a(n) A) Amplifier B) An oscillator C) Wideband amplifier D) Tuned amplifier 

Answer :

TWT is basically a(n) Wideband amplifier 

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Description :

A capacitor start, capacitor run single phase induction motor is basically a : -  a) ac series motor b) dc series motor c) 2 phase induction motor d) 3 phase induction motor

Answer :

A capacitor start, capacitor run single phase induction motor is basically a : -  2 phase induction motor 

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