Charcoal burns in air producing

Combustion is a-

Which is the hottest part in the flame of the candle

Innermost zone is the

Yellow colour in the flame denotes

Use of ..... in vehicle reduces pollution

Incomplete combustion gives

Element showing spontaneous combustion is

Consider these statements in reference to laminar burning velocity, I.It depends on air/fuel ratio. II. Type of fuel oxidizer doesn’t affect burning velocity III. It doesn’t depend on initial temperature.Which statement/s is/are true :

Identify the correct statement

Which of following visualization techniques is preferred most for locating the flame surface

Consider the following statements regarding laminar flame theory,I.It is valid for steady as well as for unsteady flow. II. Momentum equation can be neglected. III.It is valid only for inviscid flow. IV. Fourier and Fick’s law are valid. Which statement/s is/are true

A premixed CH4-air mixture emerges from a round nozzle with uniform velocity of 60 cm/s. The laminar flame speed of the CH4-air mixture is 40 cm/s. The cone angle of this flame is

Consider the following statements in reference of inert gas additives, i) It reduces the burning velocity ii) It increases the burning velocity iii) It affects the ratio of thermal conductivity and specific heat. iv) It does not affect the ratio of thermal conductivity and specific heat. Choose the correct option having correct statement/s

Burning velocity always decreases with increase in pressure. Given statement is :

In most of the cases, flame flashback occurs when

By some mean, thermal diffusivity of burned gases is halved and burning velocity is doubled . Then quenching diameter will become

When oxygen is used in place of air, minimum ignition energy

Which of followings is not an example of diffusion flame