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A universal RLC bridge uses?

1 Answer

A universal RLC bridge uses Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance.
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Description :

A dummy strain gage is used in a quarter bridge strain gage circuit to :  (A) compensate for changes in temperature and lead wire resistance  (B) produce more output voltage from the bridge  (C) increase the sensitivity of the bridge  (D) compensate lead wire resistance only

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A dummy strain gage is used in a quarter bridge strain gage circuit to : compensate for changes in temperature and lead wire resistance 

Description :

The bridge most suited for measurement of a four-terminal resistance in the range of 0.001 Ohm to 0.1 Ohm (A) Wien’s bridge (B) Kelvin double bridge (C) Maxwell’s bridge (D) Shering Bridge

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The bridge most suited for measurement of a four-terminal resistance in the range of 0.001 Ohm to 0.1 Ohm (A) Wien’s bridge (B) Kelvin double bridge (C) Maxwell’s bridge (D) Shering Bridge

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

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The bridge method commonly used for finding mutual inductance is (A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge

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The bridge method commonly used for finding mutual inductance is Heaviside Campbell bridge

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If an inductance is connected in one arm of bridge and resistances in the remaining three arms the bridge cannot be balanced.

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In an Anderson bridge, the unknown inductance is measured in terms of known capacitance and resistance.

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For measurements on high voltage capacitors, the suitable bridge is Schering bridge.

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A 17 inch personal computer uses approximately 150 watts in an hour. If you have same computer on for only 4 minutes (for checking e-mail) what would be the power consumption?  (A) 0.1 kW (B) 0.04 kW (C) 0.01 kW (D) None of the above

Answer :

A 17 inch personal computer uses approximately 150 watts in an hour. If you have same computer on for only 4 minutes (for checking e-mail) what would be the power consumption?  (A) 0.1 kW (B) 0.04 kW (C) 0.01 kW (D) None of the above

Description :

A 100-watt light bulb turned on for 8 hours uses :  (A) 800 Wh (B) 0.8 kWh (C) 8 kWh (D) None of the above

Answer :

A 100-watt light bulb turned on for 8 hours uses :  (A) 800 Wh (B) 0.8 kWh (C) 8 kWh (D) None of the above

Description :

The electrode rod used for welding uses a coating on it 

Answer :

The electrode rod used for welding uses a coating on it  to give a vapour to serve as a shielding gas to protect the weld area from atmospheric contamination and to provide slag to protect the welded area

Description :

What are the uses of Thermistors ?

Answer :

Thermistors are frequently used in electronic circuits in which it is desired to provide temperature measurement, temperature control, and temperature compensation.

Description :

MOSFET uses the electric field of?

Answer :

MOSFET uses the electric field of gate capacitance.

Description :

A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Answer :

A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

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The loop equation for a series RLC circuit gives

Answer :

The loop equation for a series RLC circuit gives

Description :

A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

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A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the C only

Description :

In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

Answer :

In a series RLC high Q circuit, the current peaks at a frequency equal to the resonant frequency

Description :

In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C?

Answer :

In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C? 7 V

Description :

In parallel RLC resonance circuit at resonance the current will be  (1) Minimum (2) Maximum (3) Zero (4) Infinite

Answer :

In parallel RLC resonance circuit at resonance the current will be Minimum 

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Answer :

When the total impendance equals  supply frequency.

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Answer :

The speed of a universal motor is usually reduced by using gearing.

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Answer :

Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.

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Answer :

A universal motor is one which can be operated either on D.C. or A.C. supply at approximately the same speed and output.

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Answer :

In a universal motor, the most common cause of brush sparking is open armature winding, shorted armature winding, shorted field winding, high commutator mica.

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Answer :

The speed/load characteristics of a universal motor is same as that of D.C. series motor.

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Answer :

The speed of a universal motor is generally reduced by using gear trains.

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A universal motor can run on either A.C. or D.C.

Description :

State working principle of universal motor with the help of diagram.

Answer :

Working Principle of Universal motor : It is modified DC series motor which can work on AC as well as DC supply. According to basic motor principle, whenever a current carrying conductor is placed in magnetic ... They have nearly same operating characteristic for both AC and DC supply. 

Description :

applications of each: i) Universal motor ii) Stepper motor.

Answer :

i) Applications of Universal motor: 1) portable drills 2) hair dryers 3) grinders 4) mixers 5) table-fans 6) blowers 7) polishers 8) Kitchen appliances  ii) Applications of Stepper motor ... 7) robotics 8) CNC machine 9) Control systems 10) Biomedical applications 10) XY recorder 11) plotters

Description :

State two applications of 1) Shaded pole motor 2) Universal motor

Answer :

(i)Applications of Shaded pole motor: 1. Small fans 2. Toy motors 3. Hair dryers 4. Ventilators 5. Electric clocks 6. Record players 7. Motorized valves 8. Gramophones 9. Photocopying ... 5. Portable Drilling Machines 6. Electric Shavers 7. Mechanical computing Machines 8. Machine Tools etc.

Description :

Draw and explain working of universal motor. Give two applications of universal motor.

Answer :

Figure of Universal motor:   Operation of universal motor on A.C. and D.C. supply:   *A universal motor works on either DC or single phase AC supply. When the universal motor is ... , regardless of AC or DC supply, universal motor works on the same principle that DC series motor works.  

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Answer :

The speed control of universal motor used for sewing machines is by varying the resistance.

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Answer :

The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.

Description :

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.

Answer :

Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.

Description :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Answer :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

Description :

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V

Answer :

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V

Description :

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses

Answer :

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses

Description :

Draw circuit diagram of symmetrical configuration of bridge converter.

Answer :

circuit diagram of symmetrical configuration of bridge converter

Description :

List out advantages and disadvantages of bridge rectifier.

Answer :

Advantages :  1. Bridge rectifier can be used in applications allowing floating output terminals i.e. not output terminal is grounded.  2. The need of center-tapped transformer is eliminated.  ... The value of the diodes used should be precise , else there will be an error in rectification

Description :

Draw full bridge & half bridge configuration with common cathode.

Answer :

Half Bridge Configuration: Full Bridge Configuration: 

Description :

 operation of whetstone bridge. 

Answer :

A Wheatstone bridge is widely used to measure the electrical resistance. This circuit is built with two known resistors, one unknown resistor and one variable resistor connected in the form of bridge. ... using a Wheatstone Bridge the unknown electrical resistance value can easily measure.

Description :

tern null as it applies to bridge measurement.

Answer :

Null measurements balance voltages so that there is no current flowing through the measuring device and, therefore, no alteration of the circuit being measured. Null measurements are generally more ... the use of standard voltmeters and ammeters, and they still have limits to their precision.

Description :

Wheatstone bridge

Answer :

Wheatstone bridge

Description :

Which of the following is true with respect to Wien Bridge? A) It does not require equal values of R or C  B) It requires that R and C values of all components must be equal C) It requires that all resistors should have equal values D) None of these

Answer :

Which of the following is true with respect to Wien Bridge? A) It does not require equal values of R or C  B) It requires that R and C values of all components must be equal C) It requires that all resistors should have equal values D) None of these

Description :

The bridge most suited for accurate measurement of relative permittivity of dielectric materials is (A) Carey Foster Bridge (B) Anderson’s bridge (C) Heaviside Bridge modified by Campbell. (D) Schering Bridge.

Answer :

The bridge most suited for accurate measurement of relative permittivity of dielectric materials is Schering Bridge.

Description :

Explain three phase bridge inverter.

Answer :

Three phase bridge inverter: Three phase bridge inverter converts DC voltage input to three-phase variable frequency variable voltage output. DC voltage source can be a DC source or output of the rectifier. ... in proper sequence. The switch may be thyristor or IGBT etc.

Description :

Explain the operation of full bridge converters with their different operating modes. State its advantages and disadvantages.

Answer :

Full bridge converter: Full bridge converter provides isolation between input and output. Full bridge converter is used for step up or step down the input voltage. Full bridge converter consists of four power semiconductor ... Require filter on both input and output.

Description :

explain blanking times for Bridge circuit?

Answer :

Blanking time is provided by driver circuit to power switch. Blanking time is important because the turn on input of one transistor must be delayed with turn off input of another transistor if both ... are connected in one converter leg. This blanking time helps in avoiding cross conduction.

Description :

In a R-L-C circuit?

Answer :

In a R-L-C circuit power is consumed in resistance and is equal to I R, exchange of power takes place between inductor and supply line, exchange of power takes place between capacitor and supply line, exchange of power does not take place between resistance and the supply line.

Description :

In a circuit containing R, L and C, power loss can take place in?

Answer :

In a circuit containing R, L and C, power loss can take place in R only.

Description :

In a loss-free R-L-C circuit the transient current is?

Answer :

In a loss-free R-L-C circuit the transient current is sinusoidal.

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