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Op amp is operational amplifier. Operational amplifier are use in ADC, zero crossing detector ,DAC, filters, Voltage regulators, Current regulators, etc.

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Description :

Draw the circuit diagram for Instrumentation amplifier using three OP-AMPs. State its advantages and applications.

Answer :

Application: 1. In Data acquisition from low output transducers such as strain gauges, Thermocouples, Wheatstone bridge measurements e.t.c 2. In Medical instrumentation, Navigation, Radar ... video data acquisition and imaging 5. High frequency signal amplification in cable RF systems 

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Answer :

1 op-amp are required to implement this equation Vo = V1.

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Description :

What is the Output voltage of Op-amp for input voltage of Vi1=150 μV,Vi2=140 μV if the amplifier has differential gain of Ad=4000 and value of CMRR is 100. 

Answer :

i don know

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Description :

How many amps do you need for a house?

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Description :

When two or more successive footnotes refer to the same work which one of the following expressions is used? (A) ibid (B) et.al (C) op.cit : (D) loc.cit. 

Answer :

Answer: A

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Description :

Describe how Op-Amp is used as adder using circuit diagram and output voltage equation.

Answer :

Summing Amplifier Circuit In this simple summing amplifier circuit, the output voltage, ( Vout ) now becomes proportional to the sum of the input voltages, V1, V2, V3, etc. Then we can ... to the non-inverting input of the op-amp, it will produce the positive sum of the input voltages.

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59 views 1 answer
Description :

The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : -  a) in inverting mode b) in non -inverting mode c) is independent of the fact whether the input is connected to inverting or non -inverting terminal d) is depending upon the fact whether the input is connected to inverting or non -inverting terminal

Answer :

The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : - is depending upon the fact whether the input is connected to inverting or non -inverting terminal

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128 views 1 answer
Description :

 In an electronic ohmmeter an op -amp is used as a: -  a) sommer b) multiplier c) buffer amplifier d) integrator

Answer :

 In an electronic ohmmeter an op -amp is used as a: -  buffer amplifier

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Description :

What is the gain of an op amp?

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Description :

What is op amp and its application?

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Description :

Define the following terms related to Op-Amp: i) CMRR ii) SVRR

Answer :

Definition:- i) SVRR: It is defined as the ratio of change of input offset voltage to the change in one supply voltage while keeping other supply voltage constant. Ideally,SVRR=0  ii)CMMR:-The ... gain should exceed common-mode gain, this will be a positive number, and the higher the better.

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280 views 1 answer
Description :

State any two characteristics of an ideal Op-amp.

Answer :

Characteristics of Op-amp: i) Input offset voltage ii) Input offset current iii) Input bias current iv) Differential input resistance v) Input capacitance vi) CMRR-common mode rejection ration vii) ... voltage rejection ratio(SVRR) viii) Output resistance ix) Voltage gain x) Bandwidth xi) Slew rate

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Description :

Draw and explain the Op-amp based subtractor

Answer :

Working The subtractor circuit is a basic op-amp circuit whose output voltage is the difference between two input voltages.  In the above circuit, the two input voltages are V1 and V2.  The op amp is used ... When differential gain is 1, ie Rf = R,  the output voltage is Vo = (V2 - V1).

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105 views 1 answer
Description :

Draw the diagram of zero crossing detector using op-amp and explain its working.

Answer :

The zero crossing detector circuit is an important application of the op-amp comparator circuit. It can also be called as the sine to square wave converter. Anyone of the inverting or non-inverting ... the possibility of any false zero crossing due to noise voltages at the op-amp input.

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192 views 1 answer
Description :

An OP amp has an open loop gain of 1,00,000. If the feedback fraction is 0.02, the approximate closed loop gain is (a) 1 (b) 1,00,000 (c) 50 (d) 0.02

Answer :

The closed loop gain Ag = G/(1+G*f) Where G is the open loop gain and f is the feedback fraction  So Ag = 49.975

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Description :

An OP amp has a slew rate of 1V/µs. At a signal frequency of 0.1 MHz, the maximum undistorted sine wave amplitude is (a) 8V (b) 4.82 V (c) 2.02 V (d) 1.592 V

Answer :

Slew rate = 2πfv where v is the amplitude V=(1/2π*0.1) = 1.592V

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Description :

An op-amp having a slew rate of 62.8 V/msec, is connected in a voltage follower configuration. If the maximum amplitude of the sinusoidal input is 10 V, then the minimum frequency at which the slew rate limited distortion would set in at the output is  (A) 1 MHz (B) 6.28 MHz (C) 10 MHz (D) 62.8 MHz

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Description :

Three individuals X, Y, Z hired a car on a sharing basis and paid Rs. 1,040. They used it for 7, 8, 11 hours, respectively. What are the charges paid by Y? (A) Rs. 290 (B) Rs. 320 (C) Rs. 360 (D) Rs. 440

Answer :

Answer: B X,Y,Z used car for 26 hours i.e 7 + 8 + 11 = 26 paid 1040. Therefore, 1040/26 = 40, Y used for 8 hours i.e 40 * 8 = 320.

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1. The members of the State Legislative Assembly are elected for what period? 2. Which compound is used for writing on glass? 3. The name Kunjarani Devi is associated with which gaem? 4. Which type of spurs is typically associated with valleyglaciers? 5. By whom was word Adivasi was used for the first ... in automobile radiators? 19. The Himalyas are approximately how many kilometer long? 20. The rock-cut temples of Mahabalipuram were built under the patronage of which king?

Answer :

Answer : 1. 5 years 2. Hydrogen fluoride 3. Weight lifting 4. Truncated 5. Thakkar Bappa 6. P. C. Mahalanobis 7. 120 mm and 80 mm 8. Indirect election 9. Sirocco 10. Art 11. Conservation ... Magsaysay 14. Fronts 15. Kanvas 16. Liver 17. By the first Amendment 18. Glycerol19. 2500 20. Pallava kings

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Four bits are used for packed sequence numbering in a sliding window protocol used in a computer network. What is the maximum window size ?  (A) 4 (B) 8 (C) 15 (D) 16

Answer :

(C) 15 

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Description :

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 :

Transformer coupled amplifiers Direct coupled amplifiers Multistage amplifiers Darlington amplifiers Emmiter follower

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Following Main Electrical Equipment used in HPS & their function: 1. Alternator 2. Exciter 3. Transformer 4. Switchgear   Function :  1) Alternator:- Alternator is coupled to ... part from the healthy section. It contains circuit breaker, relays, switches and other control devices.  

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Two wattmeters are used to measure the power in a 3 -phase balanced system. What is the power factor of the load when one wattmeter reads twice the other ?  (a) 0 (b) 0.5 (c) 0.866 (d) 1

Answer :

Two wattmeters are used to measure the power in a 3 -phase balanced system. What is the power factor of the load when one wattmeter reads twice the other ?  0.866

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Regulating transformers are used in power systems for control of : a) voltage b) power factor c) power flow d) all of the above

Answer :

Regulating transformers are used in power systems for control of :  power flow 

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Hall effect transducers are generally used for the measurement of (A) Magnetic field (B) Current (C) Electric field (D) Pressure

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Differential relays are used for the protection of equipments against   (a) Internal faults (b) Over current (c) Reverse current (d) Reverse power

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Ward - Leonard controlled DC drives are generally used for:  Heavy duty excavators

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Copper conductors are generally used for transmission lines because it has longer life and high conductivity.

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In motor circuit static frequency changers are used for speed regulation.

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What type of motor is used for drilling machines?

Answer :

universal motor also used in Handheld power tools, blowers, blenders, vacuum cleaners, polishers and kitchen appliances.universal motor is defined as a motor which may be operated either on direct or single phase AC supply at approximately the same speed and output

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Answer :

A capsule is made up of two identical corrugated diaphragms so as to form a leak- proof chamber and also referred to as an aneroid. The fluid under measurement is entered in to ... one side to communicate the displacement. The opening is provided in other diaphragm to apply the pressure. 

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What is the dimension of the copper strips used for the strip earthing?

Answer :

25 mm x 4 mm is the dimension of the copper strips used for the strip earthing.

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What is the other name used for DC generators? A. Dynamos B. Alternator C. Capacitor D. Dynamotor 

Answer :

Dynamos is the other name used for DC generators.

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For 130 kV voltage is the H-type of poles used.

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What is the factor of safety used for current ratings in a power installation?

Answer :

2 is the factor of safety used for current ratings in a power installation.

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What is electrical resistance used for?

Answer :

Used to reduced  the flow of current to the curcuit.

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What is Fleming's left hand rule used for?

Answer :

Fleming's left hand rule used for electrical motors.

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Description :

Draw pin diagram of Op-Amp IC-741.

Answer :

Pin diagram of Op-Amp IC-741 :

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Description :

Why there is decrease in supply voltage with increase in drain current in voltage controlled current source circuit using op amp and mosfet?

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Description :

Explain the function of sample and hold circuit by using op-amp.

Answer :

sample and hold circuit by using op-amp The n-channel MOSFET is driven by a control voltage VC acts as a switch. The control voltage VC is applied to the gate of the MOSFET ... called sample period. The time period during which the voltage across capacitor is constant is called Hold period.

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Description :

Describe the concept of virtual ground with reference to op-Amp.

Answer :

Virtual ground concept:-In circuit point A is virtual ground. Figure shows inverting amplifier using op-amp. In this circuit non-inverting terminal is connected to the actual ground. Due to ... zero potential without actually grounding is known as virtual ground concept. Circuit diagram: 

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126 views 2 answers
Description :

Block Diagram of op-Amp

Answer :

Block Diagram: The OP-AMP is basically a different amplifier i.e. it will amplify the voltage which is differentially present between its input terminals.  1.Input stage: The ... normally a complementary output stage. It increases the OPAMP. It also provides a low output resistance. 

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