InterviewSolution

Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.	What is the brake power if the swept volume is 3.5 liters, brake mean effective pressure is 10 bars, and speed is 6000 rpm?(a) 175 kW(b) 17.5 kW(c) 1.75 kW(d) 1750 kWI have been asked this question by my school principal while I was bunking the class.The query is from Supercharging of IC Engines topic in division Fuels & Supercharging of I.C of Automobile Engineering
Answer» Correct choice is (a) 175 kW To ELABORATE: GIVEN swept volume = 3.5 liters, brake mean effective pressure = 10 bars & SPEED = 6000 rpm. Brake power = \(\frac{brake \,mean \,effective \,pressure \,X \,swept \,volume \,X \,no.of \,cylinder \,X \,no.of \,power \,strokes}{60000} \) = \(\frac{3.5 × 10 × 10^5 × 6000}{1000 × 60000 × 2}\) = 175 kW.

2.	What is used to run the supercharging air compressor?(a) Separate electric motor(b) Engine(c) Exhaust gas turbine(d) Gear pumpThe question was posed to me by my school teacher while I was bunking the class.The doubt is from Supercharging of IC Engines in chapter Fuels & Supercharging of I.C of Automobile Engineering
Answer» Correct answer is (b) ENGINE To elaborate: Engine is used to RUN MECHANICALLY driven supercharger. The engine crankshaft is coupled with the air compressor of the supercharger which DRIVES the air compressor in the supercharger.

3.	How does the supercharger increase power output?(a) By increasing the charge pressure(b) By increasing the charge temperature(c) By increasing the speed of the engine(d) By increasing the quantity of fuel admittedThis question was addressed to me by my college professor while I was bunking the class.I'm obligated to ask this question of Supercharging of IC Engines topic in chapter Fuels & Supercharging of I.C of Automobile Engineering
Answer» Right answer is (a) By increasing the charge pressure The BEST I can explain: The SUPERCHARGER increases the power output of the engine by increasing the charge pressure. The BRAKE of the engine depends on the brake MEAN EFFECTIVE pressure.

4.	When the supercharger draws power from engine exhaust gases with the help of gas turbine, what is the supercharger called?(a) Turbocharger(b) Vane type supercharger(c) Root’s supercharger(d) Centrifugal type superchargerThe question was posed to me in an international level competition.This is a very interesting question from Supercharging of IC Engines in chapter Fuels & Supercharging of I.C of Automobile Engineering
Answer» The correct choice is (a) Turbocharger Explanation: The supercharger which USES the engine exhaust GASES for increasing the brake power is CALLED the turbocharger. The frictional and THERMAL LOSSES are less.

5.	What is the purpose of the supercharger?(a) To increase the pressure(b) To increase the speed of the engine(c) To increase the gear ratio(d) To increase the cooling rateI had been asked this question in an online interview.My query is from Supercharging of IC Engines in section Fuels & Supercharging of I.C of Automobile Engineering
Answer» The correct option is (a) To increase the PRESSURE The explanation: The purpose of the supercharger is to increase the pressure of the charge. Brake POWER = \(\frac{brake\, mean\, EFFECTIVE\, pressure \,X \,swept\, volume\, X\, no.of \,cylinder\, X\, no.of \,power \,strokes}{60000}\) . From the FORMULA, by increasing the brake mean effective pressure brake power can be increased.

6.	Why is there a need for charge cooling?(a) To increase the engine operating temperature(b) To reduce the engine operating temperature(c) To decrease the density of air(d) To increase the exhaust temperatureI got this question during an internship interview.My question is taken from Supercharging of IC Engines in chapter Fuels & Supercharging of I.C of Automobile Engineering
Answer» Right answer is (a) To increase the engine operating temperature Easiest EXPLANATION: When the AIR in the supercharger gets compressed, it gets HOT. Its temperature gets INCREASED more than the AMBIENT air temperature.

7.	Which type of supercharger is used at low speeds?(a) Centrifugal type supercharger(b) Vane type supercharger(c) Root’s supercharger(d) Twin-screw superchargerThis question was addressed to me during an internship interview.Origin of the question is Supercharging of IC Engines in portion Fuels & Supercharging of I.C of Automobile Engineering
Answer» RIGHT option is (a) Centrifugal type supercharger Explanation: Centrifugal type supercharger is USED at low speeds. The BELT from the engine drives the supercharger. The mixture coming out of the supercharger is at high PRESSURE.

8.	The turbocharger makes use of the power from the engine so that it increases the pressure.(a) True(b) FalseI had been asked this question during an interview for a job.This question is from Supercharging of IC Engines topic in chapter Fuels & Supercharging of I.C of Automobile Engineering
Answer» Correct answer is (B) False To explain: The turbocharger makes USE of the EXHAUST gases from the engine to drive the GAS TURBINE. In this type of supercharger, there is no linkage between the turbocharger and the engine.

9.	Which of the following is the advantage of Root’s supercharger?(a) It occupies less space(b) It consumes less power(c) It has minimum maintenance(d) It produces high pressureI had been asked this question in an interview.Question is taken from Supercharging of IC Engines in section Fuels & Supercharging of I.C of Automobile Engineering
Answer» The correct answer is (C) It has minimum MAINTENANCE The best explanation: One of the advantages of ROOT’s supercharger is that it has minimal maintenance. Root’s supercharger works similar to the GEAR pump. It consists of two rotors which are connected to each other by means of gear.

10.	Which of the following is not the effect of supercharging?(a) Improved cold starting(b) Increased gas loading(c) Reduced exhaust smoke(d) Increased thermal loadsThe question was posed to me during a job interview.This intriguing question comes from Supercharging of IC Engines in portion Fuels & Supercharging of I.C of Automobile Engineering
Answer» The correct CHOICE is (d) Increased thermal loads Explanation: The supercharging used for an improved cold start, increased GAS loading, reduced exhaust SMOKE, increased mechanical efficiency, etc. The disadvantage of the supercharger is that it uses the crankshaft of the ENGINE to DRIVE.