23 views
by
Write the drawback of natural rubber. Name the method used to overcome these drawback.

1 Answer

0 votes
by
Drawback of natural rubber: 

1. It has low tensile strength. 2. It is too weak to be used in heavy duty operation. 3. During summer, the raw rubber becomes soft and sticky, while in cold weather it becomes hard and brittle. 4. On stretching, it undergoes permanent deformation. 5. It has a large water absorbing capacity. 6. It is affected by solvents like gasoline, benzene, carbon tetrachloride, vegetable oils etc. 7. It gets tarnished in air due to oxidation. As a result, its durability is considerably by vulcanization.

The method used to overcome these drawbacks is Vulcanisation. 

Related questions

1 answer 8 views

Which property of rubber is used in tyres? Name and explain the property. 

asked Sep 3, 2018 by Shimroz123
1 answer 17 views

Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

asked Sep 6, 2018 by Shimroz123
1 answer 10 views

List out any four effects of electric current used in measuring instruments & write name of meter working on it.

asked Sep 6, 2018 by Shimroz123
1 answer 18 views

Distinguish between natural rubber and synthetic rubber. 

asked Sep 3, 2018 by Shimroz123
1 answer 15 views

Name any four synthetic rubber.

asked Sep 3, 2018 by Shimroz123
1 answer 41 views

Name three conventional ways of generating power. Of these three, which one contributes maximum generation in India.

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
0 answers 60 views

What is the main drawback of the underground transmission system compared to the overhead transmission system?  (A) Exposure to lightning (B) Heavy initial cost (C) Exposure to atmospheric hazards such as smoke, ice, wind (D) Induction interference between power and communication circuits 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

asked Sep 6, 2018 by Shimroz123
1 answer 26 views

Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.

asked Sep 6, 2018 by Shimroz123
1 answer 17 views

Which method is not used for conversion of AC to DC? A. Motor-generator set B. Rotary converter C. Metal rectifiers D. Dynamometers

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
2 answers 7 views

Describe the resistive method for liquid level measurement. Write its advantages and disadvantages.

asked Sep 12, 2018 by Shimroz123
1 answer 24 views

_______ electric power is the most common method used by electrical grids to transfer power.  (A) One-phase (B) Two-phase (C) Three-phase (D) None of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 73 views

The self GMD method is used to evaluate

asked May 3, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

In .Net. which method is used to display a dialog box in the document window?  A) prompt() and alert() B) alert() and confirm C) confirm() D) none of the above

asked Apr 11, 2018 in Computer Engineering by Shimroz123
0 answers 27 views

What property is used on the DataTable to indicate conflicts after update method is called?  (1) HasErrorConflict (2) HasError (3) HasCollision (4) HasDataError 

asked Apr 10, 2018 in Computer Engineering by Shimroz123
1 answer 14 views

An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is (A) 0 to 2.76 (B) 0 to 9.81 (C) 0 to 11.20 (D) 0 to 52.10

asked Apr 26, 2018 in Electronics Engineering by Shimroz123
1 answer 12 views

In any network the current will be seen to be consisting of a forced current and a natural current. A forced current is  (a) A steady-state current with external source but a natural current is a transient current in a closed circuit with no external source. (b) A transient current with external source but a ... an external source. (d) A transient current in a closed circuit without external source, while a natural current is a steady-state current with an external source.

asked Apr 23, 2018 in Electrical Engineering by Zeeshan
1 answer 18 views

State the function of armature winding and name the material used for its construction.

asked Sep 15, 2018 by Shimroz123
0 answers 21 views

Name the types of generators (alternators) used in (1) thermal plant and (2) in hydel power plant. 

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
1 answer 74 views

Give broad classification of maintenance with meaning of each type. State the factors on which ideal maintenance of electric rolling stock is judged. Give any two means to improve any one factor of these.

asked Sep 2, 2018 by Shimroz123
1 answer 11 views

Which of these materials requires the least value of magnetic field strength to magnetize it?  a. Nickel b. Silver c. Tungsten d. Sodium chloride 

asked May 17, 2018 in Telecommunication Engineering by anonymous
1 answer 19 views

Which of the following disk scheduling techniques has a drawback of starvation? (A) SCAN (B) SSTF (C) FCFS (D) LIFO 

asked Apr 23, 2018 in Computer Engineering by Shimroz123
1 answer 19 views

Write one advantage and one disadvantage each for spring control method and gravity control method.

asked Sep 6, 2018 by Shimroz123
1 answer 18 views

Which of the following is the name given to resistance of thin films that are uniform in thickness? A) Area resistance B) Sheet resistance C) Filmy resistance D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

Which of the following is the name given to the lines of electric force which move so that its beginning traces a closed curve on a positive surface and its end traces a corresponding closed curve on the negative surface? A) Tube of surface B) Tube of lines C) Tube of force D) Tube of electricity

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

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

asked Sep 6, 2018 by Shimroz123
1 answer 11 views

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

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

Describe the method used for concentration of sulphide ore. 

asked Sep 3, 2018 by Shimroz123
0 answers 18 views

The method of speed control used for increasing the speed of a dc shunt motor above its rated speed is  1) armature resistance control 2) field control (3) armature voltage control (4) series parallel control 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

Which of these is correct with respect to a product developed or a service performed?. a. Bad quality is acceptable, but bad grade is not. b. Bad grade is acceptable, but bad quality is not. c. Neither bad grade nor quality is acceptable. d. Grade and quality is the same thing.  

asked Aug 31, 2018 by Shimroz123
1 answer 43 views

Consider the following statements with regard to Moving Iron (MI) instruments :  1. These instruments possess high operating torque.  2. These instruments can be used in ac and dc circuits.  3. Power consumption in these instruments is lower for low voltage range.  Which of the above statements are correct ?  (a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 8 views

Give the properties and application of following materials :i) mica ii) rubber

asked Sep 4, 2018 by Shimroz123
1 answer 18 views

Describe the valcanisation of rubber. 

asked Sep 3, 2018 by Shimroz123
1 answer 5 views

Write any four important points related to the construction of feeding post.

asked Sep 2, 2018 by Shimroz123
0 answers 19 views

The average time necessary for the correct sector of a disk to arrive at the read write head is  (1) Down time (2) Seek time (3) Rotational delay (4) Access time  

asked Apr 10, 2018 in Computer Engineering by Shimroz123
1 answer 64 views

With the help of neat diagram, explain the method to obtain unidirectional polarity in train lighting.

asked Sep 2, 2018 by Zeeshan
0 answers 30 views

In the solution of load flow equation, Newton Raphson (NR) method is superior to the GaussSeidal (GS) Method, because the:  (A) Convergence characteristic of the NR methods are not affected by selection of slack bus (B) Number of iterations required in the NR method is not independent of the size of the system (C) Time ... the NR method is less when compared to the GS method (D) Number of iteration required in the NR method is more than compared to that in the GS method 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

Which method can be used for absolute measurement of resistance? A. Ohm's law method B. Wheatstone bridge method C. Both A & B D. None of these. 

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

 Gauss-Seidel iterative method can be used for solving a set of?

asked Mar 27, 2018 in Power system by Shimroz123
1 answer 27 views

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

asked Apr 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 13 views

For fabricating cost effective high valued integrated resistors in IC, the method used is  A) Diffused resistor B) Epitaxial resistor C) Pinched resistor D) Thin film resistor

asked Apr 5, 2018 in Electronics Engineering by Shimroz123

Welcome to electronics2electrical.com here you can ask questions related to electrical, electronics, mechanical, telecommunication, instrumentation, computer, mathematics, physics etc.
Be respectful to all the members. Do not copy and paste the answers from other websites which have copyright content. While asking question give full details about it.

Categories

Most popular tags

power motor dc circuit transformer voltage current used system phase resistance factor synchronous load ac energy induction electric generator series frequency between speed capacitor use electrical meter line difference control type mosfet transmission magnetic plant high single instrument bjt unit source advantages function diode and machine winding field define torque parallel amplifier supply shunt thyristor motors electricity arduino maximum time relay armature problem value on transformers types coil diagram state flow ratio material three formula starting direction theorem method emf operating efficiency digital wave microprocessor test instruments inductance loss measure operation connected signal low applications effect single-phase network temperature working constant losses different law wattmeter measuring compare controlled breaker drive device logic rc full switch flux wire resistivity disadvantages free of materials machines angle force converter conductor transistor gain open protection scr core measurement number bridge principle generators reactance circuits negative the friction iron loop short pole battery conservation steam resistors hysteresis computer using analog lines secondary station gate a rectifier inverter linear induced relays nuclear capacitance basic characteristics design direct work rotor electronics ammeter forces diesel damping rlc connection factors capacitors minimum insulation moving regulation running self systems air fault range main stability quality starter igbt eddy alternator ideal rl average 3-phase plants arc thermal error fuzzy biasing dielectric pressure balanced superposition errors copper rotation feedback impedance measured electronic electrons charge inductive transfer explain start off back curve over solar is three-phase tariff locomotive peak bias zener engineering commutator surge conductors rating universal potentiometer density permanent mechanical transducer capacity memory adc excitation two fuse pure harmonics application semiconductor inductor internal pmmc reaction welding resonance traction permeability breakers rms designed electromagnetic si generation brushes switching capacitive shaded rate 1 distribution resistor methods delta star oscillator reluctance simplification algebra 8085 boolean weston dynamometer insulating strength installation definition fuel heating earth units

8,450 questions

7,047 answers

132 comments

3,084 users

...