Bissoy.com
Doctors Medicines MCQs Q&A

The discharge of hydrocarbons from petrol automobile exhaust is minimum when the vehicle is

The discharge of hydrocarbons from petrol automobile exhaust is minimum when the vehicle is Correct Answer Cruising

Explanation:

The driving modes may be idling, cruising, acceleration and deceleration. These modes complete one driving cycle. Other factors affecting the emission rates are the speed, acceleration and engine load of the vehicle.

Low speeds, congested driving conditions, sharp acceleration, deceleration, etc. result in higher emissions. On the other hand, intermediate speeds and low-density traffic conditions cause lower emissions. 

The discharge of hydrocarbons from petrol automobile exhaust is minimum when a vehicle is accelerating as the power requirement is maximum and complete combustion is taking place. The exhaust is maximum when the vehicle is decelerating.

Related Questions

Two statements and a few problems are given. Which of the following problems can be solved through these statements? Statement I: A container contains 28L mixture of diesel and petrol. Statement II: The ratio of diesel to petrol is 3 : 1 and 28L of Petrol is added to the container. Problem 1: What is the quantity petrol in the container before petrol is added? Problem 2: What is the ratio of diesel to Petrol in the final mixture? Problem 3: What is the cost of Petrol in the mixture if total cost of mixture is Rs.1500?
My Scooty gives an average of 40 kmpl of petrol. But after recent filling at the new petrol pump, its average dropped to 38 kmpl. I investigated and found out that it was due to adulterated petrol. Petrol pimps add kerosene, which is $$\frac{2}{3}$$  cheaper than petrol, to increase their profits. Kerosene generates excessive smoke and knocking and gives an average of 18 km per 900 ml. If I paid Rs. 30 for a litre of petrol, What was the additional amount the pump-owner was making?
Two centrifugal pumps P and R are available for use in a pipe flow system and their head-discharge characteristics are as follows. Pump P Pump R Discharge (cumecs) Head (m) Discharge (cumecs) Head (m) 0 40 0 45 0.12 35 0.14 40 0.2 28 0.24 35 0.3 18 0.3 28   The following statements (S1, S2, and S3) pertain to the head and discharge values during actual operation. Neglect losses in the system. Which of the following statements are correct? S1: When the two pumps P and R are connected in parallel, the discharge is 0.36 cumecs corresponding to a head of 35 m. S2: When the two pumps P and R are connected in parallel, the discharge is 0.36 cumecs corresponding to a head of 70 m. S3: When the two pumps P and R are connected in series, the discharge is 0.3 cumecs corresponding to a head of 46 m.
In a newly developed innovative idea brought up by CSIR in India, gas turbine exhaust gas are being utilized to convert feedwater into steam. Certain data of the experiment are as follows: mass flow rate of exhaust gas = 40 kg/hr, enthalpy of exhaust gas at the time of their exit from gas turbine is 600 kJ/kg, steam turbine output as measured by brake dynamometer = 60 hp-sec, thermal efficiency of steam power plant is 0.25, efficiency of exhaust gas in converting feedwater into steam is taken as 50%. Find the enthalpy of exhaust gas remaining after they generate steam from feedwater?
Consider the following statements about hydrocarbons. i. Alkanes are saturated hydrocarbons that contain single bonds. ii. Alkynes are unsaturated hydrocarbons that contain one or more double bonds.  iii. Alkenes are Unsaturated hydrocarbons that contain one or more triple bonds.   
An empty fuel tank of a car was filled with A type petrol. When the tank was half-empty, it was filled with B type petrol. Again when the tank was half-empty, it was filled with A type petrol. When the tank was half-empty again, it was filled with B type petrol. What is the percentage of A type petrol at present in the tank?
An empty fuel tank of a car was filled with A type petrol. When the tank was half-empty, it was filled with B type petrol. Again when the tank was half-empty, it was filled with A type petrol. When the tank was half-empty again, it was filled with B type petrol. What is the percentage of A type petrol at present in the tank ?
An empty fuel tank to a car was filled with A type of petrol. When the tank was quarter empty, it was filled with B type of petrol. Again when the tank was half empty, it was filled with A type of petrol. When the tank was half empty again, it was filled with B type of petrol. At this time, what was the percentage of A type of petrol in the fuel tank?
An empty fuel tank to a car was filled with petrol of type A. When the tank was quarter empty, it was filled with petrol of type B. Again when the tank was half empty, it was filled with petrol of type A. When the tank was half empty again, it was filled with petrol of type B. At this time, what was the percentage of petrol of type B in the fuel tank?
A petrol pump had 1668 litres of petrol in stock. During the day time 534 litre of petrol were sold. How much petrol was left in petrol pump?