Mechanical Engineering MCQs

Page No. 183

For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?


aincrease


bdecrease


cremain unaffected


dother factors control it


View Answer increase

The criterion of the thermodynamic efficiency for rotary compressor is_________________?


aisentropic compression


bisothermal compression


cpolytropic compression


dany one of the above



The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________?


a0.1%


b0.5%


c1%


d5%


View Answer 1%

For minimum work in multistage compression, assuming same index of compression in all stages_________________?


awork done in first stage should be more


bwork done in subsequent stages should increase


cwork done in subsequent stages should decrease


dwork done in all stages should be equal



Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?


aless power requirement


bbetter mechanical balance


cless loss of air due to leakage past the cylinder


dlower volumetric efficiency



For supplying intermittent small quantity of air at high pressure, following compressor is best suited__________________?


acentrifugal


breciprocating


caxial


dscrew


View Answer reciprocating

Diffuser in a compressor is used to _____________________?


aincrease velocity


bmake the flow stream-line


cconvert pressure energy into kinetic energy


dconvert kinetic energy into pressure energy



Phenomenon of choking in compressor means __________________?


ano flow of air


bfixed mass flow rate regardless of pressure ratio


creducing mass flow rate with increase in pressure ratio


dincreased inclination of chord with air steam



The ratio of isentropic work to Euler work is known as_____________________?


apressure coefficient


bwork coefficient


cpolytropic reaction


dslip factor


View Answer pressure coefficient

The indicated work per unit mass of air delivered is___________________?


adirectly proportional to clearance volume


bgreatly affected by clearance volume


cnot affected by clearance volume


dinversely proportional to clearance volume



Goto Page No.

Page 183 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