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What is the working principle of pressure transmitter?
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State working principle of alternator. State the meaning self and separate excitation. 

Answer :

Working principle of alternator: When a conductor is moved in magnetic field or a magnetic field moved with respect to conductor, according to Faraday's law of electromagnetic induction, the conductor ... like battery or shaft-mounted exciter, then the excitation is said to be separate excitation.

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Explain the working principle of induction motor. 

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Working principle of induction motor: * When the motor is excited with three-phase supply, three-phase stator winding carries three-phase currents & produces a rotating magnetic field of constant magnitude and ... , which tend to move the rotor in the same direction as the rotating magnetic field. 

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In metal-arc inert gas welding the Weld area is shielded by an effectively inert atmosphere of argon, helium, carbon dioxide, or various other gas mixtures . The consumable bare Wire is fed automatically ... of the molten-weld puddle. Multiple-weld layers can be deposited at the joint. 

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Thyristor operated dimmer: A popular thyristor operated dimmer circuit employ TRIAC-DIAC phase control for low AC power control. During each half-cycle, the capacitor charges through (R1+VR1). When the ... time constant {C (R1+VR1)}. Thus by reducing VR1 the lamp brightness can be increased.

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State the working principle of gears and give its applications.

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Working Principle:  Gears are mechanical elements which transmit motion by means of successively engaging teeth.  Gears are used to transmit motion from one shaft to another or between ... Agricultural equipment.  Industrial construction.  Mining equipment.  Automotive equipment.

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Describe the working principle of photoelectric pickup type tacho-generator.

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Working: Working principle: The light passes through the holes available on the rotating disc with a specific interval, depends on the angular speed of disc having equidistant holes. The frequency of this light pulses ... by N=f/HS  N=speed  f=frequency  Hs=holes on the disc

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Explain construction and working principle of single phase transformer.

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A single phase transformers is an electrical device that accepts single-phase AC power and outputs single-phase AC. PRINCIPLE... The single-phase transformer works on the principle of ... and secondary windings. Thin steel laminations shall be employed to prevent power losses from the core.

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State working principle of PMMC instrument.

Answer :

Working Principle of PMMC Instrument: When current carrying conductor is placed in a constant magnetic field, it experiences a force proportional to the current and produces proportional deflection torque. 

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Draw symbol of LED and explain it’s working principle.

Answer :

Construction of LED: The basic structure of LED is shown in fig.(a). The active region exists between the p and n regions. The light emerges from the active side in all the directions when electron hole-pairs ... fig.(c). In this way an LED emits light. This is the principle of operation of LED.

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Description :

State the working principle of transformer.

Answer :

Working principle of transformer : Transformer works on the principle of mutual electromagnetic induction. When AC voltage is applied to the primary winding it causes ac current to flow through primary ... the secondary winding. The current flows in the secondary circuit if load is connected.

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Description :

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

Answer :

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

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Description :

The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is A) 50 W B) 66 W C) 68 W D) 70 W 

Answer :

The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is 66 W

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State working principle of earth tester.

Answer :

Earth tester:-The resistance of the earth is measured with the help of earth tester. It consists of a hand cranked type generator, the magnet poles, crossed coils and flexible spirals. It consists ... deflection of the pointer will indicate directly resistance in ohm of the earth under test.

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Description :

Compressor pressure ratio (CPR)

Answer :

Compressor pressure ratio (CPR), is the ratio of the air total pressure exiting the compressor to the air pressure entering the compressor. This number is always greater than 1.0.

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Description :

Draw Bourdon tube with LVDT setup for pressure measurement.

Answer :

Bourdon tube with LVDT setup for pressure measurement.

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Description :

Define absolute pressure, atmospheric pressure.

Answer :

Absolute Pressure : Absolute pressure is defined as actual total pressure including atmospheric pressure acting on a surface  Unit of absolute pressure is pounds per square inch absolute and it ... by the air surrounding to the earth. Unit of atmospheric pressure is Pounds per square inch.

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Description :

State how pressure measurement can be done using Dead weight tester.

Answer :

The handle is fully drawn out and the oil is allowed to enter in the cylinder (i.e. gauge and piston) The weight to be measured is placed on the platform. Now the handle is turned ... of the area of the piston and the pressure indicated on the gauge is equal to the weight under measurement.

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With a neat diagram, explain back pressure steam turbine co-generation system.

Answer :

Back pressure steam turbine co-generation system: In this type steam enters the turbine chamber at High Pressure and expands to Low or Medium Pressure. Enthalpy difference is used for generating power / work. ... , the overall thermal efficiency of the system could reach as much as 90 percent.

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Description :

List the four different units of pressure.

Answer :

Different units of pressure. 1) Measured in pascal(Pa). 2) Measured in pounds per square inch(psi) 3) Measured in kilogram per square of centimeter (Kg/cm2 ). 4) Measured in newton per square meter (N/m2 ). 5) Measured in terms of liquid columns. mmHg or mmWc

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Description :

List four electric pressure transducer.

Answer :

List of electric pressure measuring devices: 1. Diaphragm with strain gauge 2. Bourdon Tube with LVDT 3. Differential Pressure cell 4. Piezoelectric type pressure transducer 5. Capacitance pressure transducer 6. Optical Pressure transducer 7. Resistive pressure transducer 

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Description :

The pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows: (A) Pressure is lower but velocity is higher (B) Pressure is higher but velocity is lower (C) Both pressure and velocity are lower (D) Pressure and velocity are identical

Answer :

The pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows: (A) Pressure is lower but ... lower (C) Both pressure and velocity are lower (D) Pressure and velocity are identical

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Description :

A piezo-electric type pressure sensor has a sensitivity of 1 mV/kPa and a bandwidth of 300 Hz to 300 kHz. For a constant (dc) pressure of 100 kPa, the steady state output of the sensor in millivolt is (A) 0 (B) 2 (C) 4 (D) 6

Answer :

A piezo-electric type pressure sensor has a sensitivity of 1 mV/kPa and a bandwidth of 300 Hz to 300 kHz. For a constant (dc) pressure of 100 kPa, the steady state output of the sensor in millivolt is 0

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Description :

Electric pressure is also called?

Answer :

Electric pressure is also called voltage.

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Description :

If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be?

Answer :

If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be zero.

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Answer :

In case of steam engines the steam pressure is 10 to 15 kgf/cm2.

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Description :

Answer :

The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.

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Description :

Answer :

In a low power factor wattmeter the pressure coil is connected to the load side of the current coil.

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What is the principle of synchronous motor?

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What is the principle of DC generator?

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Description :

What is the principle of AC motor?

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Description :

What is the principle of DC motor?

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Description :

State the principle of operation of d.c. motor.

Answer :

When a current carrying conductor is placed in a magnetic field, the conductor experiences the force. The magnitude of force is given by F = BIL newton  where F – Force   B – maximum flux density   I – Current   L – Length of conductor

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Description :

 operating principle of PUT.

Answer :

Constructional diagram & Operating principle of PUT:  The PUT is a PNPN device similar to SCR, but its operation is similar to the UJT. The PUT behave like a UJT whose trigger voltage VP can be set ... low resistance and VAK ≈ 1V). The PUT is also referred to as a complementary SCR (CSCR). 

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Description :

State principle of operation of piezo-electric transducer. State its application.

Answer :

The piezoelectric element used for converting mechanical movement into electric signals. The mechanical deformation generates charges and this charge appears as a voltage across the electrodes.  ... destructive test (NDT) equipments 6. Piezoelectric materials are used in ultrasonic transducers. 

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Description :

Describe principle of operation of Doppler type ultrasonic flow meter with diagram. 

Answer :

Diagram: Working:  The flow meter consists of a crystal transducer mounted outside the pipe in which flow is to be measured. This transducer is a piezoelectric crystal which ... , so the frequency of the reflected wave is shifted to particle velocity, according to Doppler principle.

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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.

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Description :

Explain the operating principle of LASER and list applications of LASER diode.

Answer :

A basic construction of Laser diode is as shown . A PN junction is formed by two layers of doped gallium arsenide. There is highly reflective surface at one end of PN junction and ... 6. laser scanning and light beam illumination. 7. Military applications 8. Medical surgery 9.Diamond cutting

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Description :

The transformer works on the principle of: (A) Mutual induction (B) Mutual capacitance (C) All of the above (D) None of the above

Answer :

The transformer works on the principle of:  Mutual induction

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Description :

Principle of Thermocouple is based on :  (A) Thomson effect (C) Seebeck effect (B) Peltier effect (D) Kelvin effect

Answer :

 The  principle is  based on Seebeck   effect.

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Description :

D' Alembert's principle is used for?

Answer :

D' Alembert's principle is used for reducing the problem of kinetics to equivalent statics problem.

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Description :

According to principle of moments?

Answer :

According  to  principle  of  moments  clockwise  moments  equals   anticlockwise  moments.

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Description :

Answer :

A hysteresis motor works on the principle of hysteresis loss.

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Description :

 If it takes a transmitted signal 1m sec to go up to the target and come back after reflection, how far is the transmitter from the target? A) 150 Km B) 150 m C) 15 Km D) 1500 m 

Answer :

 If it takes a transmitted signal 1m sec to go up to the target and come back after reflection, how far is the transmitter from the target? A) 150 Km B) 150 m C) 15 Km D) 1500 m 

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Describe working of online UPS. List any two applications of UPS.

Answer :

Online UPS: The block diagram of the on line UPS systems is as shown, where the load is connected to the invertor through the UPS static switch. The UPS static switch is ... 4) Healthcare: hospitals, clinics and retirement homes 5) Telecommunications 6) Special projects (events)

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Explain working of static AC circuit breaker. 

Answer :

Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

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Description :

Explain construction and working of AC servomotor.

Answer :

Construction of AC Servo Motor: AC servo motor is mainly composed of a stator and a rotor. Laminated stator core is usually made of silicon steel. Two phase windings are placed in the stator slots at 90 degree ... on rotor. Due to the force or torque acting on the rotor, it is set in motion. 

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116 views 1 answer
Description :

Describe with neat sketch working of hysteresis motor.

Answer :

Working: When stator is energized with single phase ac supply, rotating magnetic field is produced because of starting (auxiliary) and main windings, which remain in circuit permanently. The ... the principle of magnetic locking this motor either rotates at synchronous speed or not at all.

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147 views 1 answer
Description :

Explain the working of Neon sign tube with diagram.

Answer :

Neon sign tube: The construction & circuit diagram for neon tube is as shown in fig. Basically neon tube is used for advertisement or decoration purpose. The maximum length of tube is ... the HT transformer must be earthed separately. * Caution notice of danger board is required.

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201 views 1 answer
Description :

Explain the working of HPMV Lamp with neat diagram.

Answer :

High-pressure Mercury-Vapour Lamp (HPMVL):  Working:  * Whenever 1-ph, 230V, AC Supply is provided to the discharge tube of MVL, initially the current flows from Phase to the choke to ... : The function of power factor improvement capacitor is to improve the power factor from 0.5 to 0.95.

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226 views 1 answer
Description :

With a neat sketch give the working of shaded pole induction motor.

Answer :

Explanation: It has squirrel cage rotor and salient pole stator. The stator poles are shaded partially by short circuited conductor band to create the phase difference between the fluxes emerging from shaded ... rotating magnetic field in the air-gap and torque is exerted on the squirrel cage rotor.

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