Mechanical Engineering MCQs

Page No. 50

For low load operation, more suitable (economical) engine is_______________?


aS.I. engine


bC.I. engine


cboth are equally good


dmulticylinder engine


View Answer C.I. engine

Hot air standard diesel cycle efficiency with increase in value of C„_______________?


aincreases


bdecreases


cremains unaffected


ddepends on other factors


View Answer decreases

Which of the following engines can work on very lean mixture__________________?


aS.I. engine


bC.I. engine


ctwo stroke engine


dfour stroke engine


View Answer C.I. engine

In open combustion chamber in diesel engines____________________?


athe shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture


bfuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat


conly a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge


dfuel is injected at atmospheric pres¬sure



In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?


aincrease the knocking tendency


bdecrease the knocking tendency


cnot affect the knocking tendency


dincrease or decrease knocking tendency depending on strength and time of spark



Theoretically, the following engine should have maximum efficiency________________?


agas engine


b2-stroke S.I. engine


c4-stroke S.I. engine


d4-stroke C.I. engine


View Answer 4-stroke C.I. engine

The thermal efficiency of a diesel engine is of the order of_________________?


a92%


b68%


c52%


d34%


View Answer 34%

The ignition coil in diesel engines produces voltage of the order of________________?


a6 to 12 volts


b240 volts


c1000 volts


d20,000 volts


View Answer 20,000 volts

In petrol engines, advancing the spark timing will_______________?


aincrease the knocking tendency


bdecrease the knocking tendency


cnot affect the knocking tendncy


dincrease or decrease knocking tendency depending on strenght and time of spark



The essential equipment for producing high vlotage for sparking in petrol engines with battery is_______________?


aignition coil


bignition coil and distributor


cignition coil and condenser


dignition coil and contact breaker



Goto Page No.

Page 50 of 190

Alphabetical MCQs Categories

Here below You find all kind of categories of MCQs in alphabetical order.


"Comprehensive Collection of MCQs: Alphabetically Organized by Subject"

"Discover an extensive collection of multiple-choice questions (MCQs) neatly categorized by subject from A to Z. This resource is designed for anyone eager to explore various topics in a straightforward and organized manner. Whether you're a student preparing for exams, an educator seeking supplementary materials, or simply curious about different subjects, this compilation offers a convenient way to learn and assess your knowledge. With questions arranged alphabetically, navigation is effortless, allowing you to delve into subjects of interest at your own pace. Engage, learn, and expand your understanding with this accessible and comprehensive repository of MCQs!"


BolPakistan

bolpakistan.com.pk includes Job Mcqs and Pak Mcqs is the Top Largest Mcqs Forum in World, in which you can read Mcqs of All Subjects, PPSC test preparation, FPSC, NTS and PPSC PAST PAPERS, PPSC PAST MCQS. A Collection of Repeated MCQs for JOBs seekers.

Copyright © 2024, Designed & Developed by BolPakistan