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

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Description :

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Answer :

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

Description :

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carrier current capacity is 50 mA. The torque on the coil is

Answer :

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carrier current capacity is 50 mA. The torque on the coil is 200µNm

Description :

Permanent magnet moving coil instruments are used for

Answer :

PMME are mostly used for measuring voltage and current.

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

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

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

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

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

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Basically a potentiometer is a device for comparing two voltages.

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.

Description :

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω

Answer :

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is 9997 Ω

Description :

State the material used for moving coil and former for PMMC instruments. 

Answer :

Material Used for Moving Coil and Former for PMMC Instruments:  Material used for moving coil: Copper  Material used for Former: Aluminium

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The command line interpreter that enables the users to interact with operating system is called the A) Window B) Shell C) Process D) Kernel 

Answer :

The command line interpreter that enables the users to interact with operating system is called the Shell 

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

Description :

Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

Answer :

(i) Material used for Moving coil: Copper, Aluminum( some times)  (ii) Permanent magnets are made of special alloys such as :  Aluminum-Nickel-Cobalt (Alnicos)  Strontium-Iron  Neodymium-Iron-Boron  Samarium-Cobalt.

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 

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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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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Linear and non-linear device

Answer :

Linear and non-linear device

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

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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Answer :

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

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Is FPGA a volatile device?

Answer :

Yes, FPGA is a volatile device.

Description :

What is an example of an analog device?

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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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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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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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No, BJT is a current controlled device .

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Answer :

already answered here is mosfet current controlled device?

Description :

A control system having unit damping factor will give  (1) Oscillatory response (2) Undamped response (3) Critically damped response (4) No response

Answer :

1

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Answer :

Commonly used instruments in power system measurement are induction.

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The desirable static characteristics of a measuring system are accuracy, sensitivity and reproducibility.

Description :

vertical deflection system and explain its operation.

Answer :

The main function of the vertical deflection system , is to provide an amplified signal of proper level to derive the vertical deflection plates without any distortion. For amplification of the ... suppression, reduced nonlinear effects because none of the plates are at ground potential.

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Draw block diagram of pneumatic system showing its basic components. State the functions of control value and air actuator.

Answer :

Diagram : Control valve: - control and regulates the direction of flow and pressure etc. Air actuator: - Air cylinders and motors are used to obtain the required movements of direction flow.

Description :

A second order system shows 100% overshoot in its unit step response. It can be categorized as (A) underdamped system. (B) overdamped system. (C) Critically damped system. (D) undamped system.

Answer :

A second order system shows 100% overshoot in its unit step response. It can be categorized as undamped system.

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Answer :

MOSFET  are voltage controlled devices.

Description :

Answer :

BJT is current controlled device.

Description :

Which of the following is the appropriate definition of a computer ? (A) Computer is a machine that can process information. (B) Computer is an electronic device that can store, retrieve and process both qualitative and quantitative data quickly and accurately. (C) Computer is an electronic device that ... , retrieve and quickly process only quantitative data. (D) Computer is a machine that can store, retrieve and process quickly and accurately only qualitative information

Answer :

(B) Computer is an electronic device that can store, retrieve and process both qualitative and quantitative data quickly and accurately.

Description :

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Answer :

(i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

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A boys rows to a certain place and comes back, but by mistake he covers 2/3rd more distance while coming back. The total time for this journey is 20 hours. The ratio of speed of boat to that of stream is 2 : 1. If the difference between upstream and downstream speed is 24km/hr, then how much time will the man take to reach to starting point from his present position? A) 2hr 13mints B)1hr 30 mins C) 2hr 30mins D)1hr 40 mins

Answer :

ANSWER : A Explanation: let speed of boat and stream be 2x and x respectively So downstream speed = 2x+x = 3x, and upstream speed = 2x-x = x Let total distance between points is d km So he covered d ... with speed 3x = 48 km/hr(downstream) So time is 80/36 * 60 = 133.33 minutes = 2hr 13mins

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Answer :

Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

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Linear Algebra Problem the solution to the system of equations

Answer :

Linear Algebra Problem the solution to the system of equations https://youtu.be/y_FlupirxZM

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What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

Answer :

What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

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Phase margin is the amount of angle to make the system  (1) Oscillatory (2) Stable (3) Unstable (4) Exponential

Answer :

Phase margin is the amount of angle to make the system Unstable 

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The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero

Answer :

The sequence components of current of a single-phase load connected to a 3-phase system are equal positive, negative and zero sequence components

Description :

If non-linear loads are connected to the power system, then (A) displacement power factor is same as the total power factor (B) displacement power factor is not equal to the total power factor (C) displacement power factor is due to harmonic currents (D) total power factor is due to fundamental component of current

Answer :

If non-linear loads are connected to the power system, then displacement power factor is not equal to the total power factor

Description :

In Torque-Voltage analogy, the Moment of Inertia of a mechanical rotational system is analogous to (A) Capacitance C. (B) Inductance L. (C) Resistance R. (D) Inductive reactance XL

Answer :

In Torque-Voltage analogy, the Moment of Inertia of a mechanical rotational system is analogous to Inductance L.

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