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Which of the following are essential for a good combustion chamber of turbojet engine? 1. It should allow complete combustion of fuel. 2. It should maintain sufficiently high temperature in the zone of combustion in addition to proper atomization of fuel thus leading to continuous combustion. 3. It should not have high rate of combustion. 4. The pressure drop should be as small as possible
Abnormal combustion knock produced by surface ignition in SI engines is not harmful as normal combustion knock.
Consider the following statements regarding C.I. engine: 1. C.I. engines are more bulky than S.I. engines 2. C.I. engines are more efficient than S.I. engines 3. Lighter flywheels are required in C.I. engines Which of the above statements are correct?
Consider the following statements: Combustion chamber is 1. the volume between TDC and BDC during the combustion process 2. the space enclosed between the upper part of the cylinder and the top of the piston during the combustion process 3. the space enclosed between TDC and the top of the piston during the combustion process Which of the above statements is/are CORRECT?
Consider the following statements: 1. Both Otto and Diesel cycles are special cases of dual combustion cycle 2. Combustion process in IC engines is neither fully constant volume nor fully constant pressure process 3. Combustion process in ideal cycle is replaced by heat addition from internal source in closed cycle 4. Exhaust process is replaced by heat rejection in ideal cycle Which of the above statements are correct?
The detonation occurs where the mixture ignites spontaneously in the combustion chamber, giving abnormal and rapid combustion.
Directions : Following question consists of a statement followed by three arguments I, II and III . You have to decide which of the arguments is a STRONG arguments and which is a WEAK Argument. Statement : Should coal engines be replaced by electric engines in trains? Arguments : I. Yes. Coal engines cause a lot of pollution. II. Yes. Electric engines are good on performance, easy to operate and low on maintenance. III. No. India does not produce enough electricity to fulfil its domestic needs also.
Directions : Following question consists of a statement followed by three arguments I, II and III . You have to decide which of the arguments is a STRONG arguments and which is a WEAK Argument.

Statement : Should coal engines be replaced by electric engines in trains?

Arguments :
I. Yes. Coal engines cause a lot of pollution.
II. Yes. Electric engines are good on performance, easy to operate and low on maintenance.
III. No. India does not produce enough electricity to fulfil its domestic needs also.
The following sentences form a paragraph. These four parts are numbered as P, Q, R and S. They are not given in their proper order. Read the sentences and choose the alternative that arranges them in correct order. P. Inverse problem refers to the scientific problem of estimating the different causes that led to a particular outcome.  Q. This is in contrast to the forward or the direct problem where scientists try to find the outcome that results from a series of causes. R. A scientist observing a photograph, for instance, would be faced with the inverse problem while trying to figure out the various causal factors that combined to form the final photograph. The inverse problem is applied to understand processes in a wide variety of sciences. S. Scientists trying to understand an observation may at times have to work backwards to estimate the causal factors behind it.
Consider the following statements with regard to IC engines: 1. For best fuel economy of spark ignition engines, the fuel-air mixture should be lean 2. With supercharging, the specific consumption in compression ignition engines increases 3. With increase of load, knocking tendency in compression ignition engines increases Which of the above statements are correct?