Mechanical Engineering MCQs

Page No. 176

In jet propulsion power unit, the inlet duct of diverging shape is used in order to _______________ ?


acollect more air

✖


bconvert kinetic energy of air into pres-sure energy

✓


cprovide robust structure

✖


dbeautify the shape

✖



The air entry velocity m a rocket as compared to aircraft is_________________?


asame

✖


bmore

✖


cless

✖


dzero

✓


View Answer zero

Propulsion efficiency of the following order-is obtained in practice _______________?


a34%

✖


b50%

✖


c60%

✓


d72%

✖


View Answer 60%

The maximum propulsion efficiency of a turbojet is attained at around following speed __________________?


a550 km/hr

✖


b1050km/hr

✖


c1700 km/hr

✖


d2400km /hr

✓


View Answer 2400km /hr

A rocket works with maximum overall efficiency when air craft velocity is equal to the_________________?


ajet velocity

✖


btwice the jet velocity

✖


chalf the jet velocity

✓


daverage of the jet velocity

✖


View Answer half the jet velocity

In the cross compounding of the gas turbine plant__________________?


ah.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine

✖


bh.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine

✓


cboth the arrangements can be employed

✖


dall are connected in series

✖



Propulsive efficiency is defined as ratio of___________________?


athrust power and fuel energy

✖


bengine output and propulsive power

✖


cpropulsive power and fuel input

✖


dthrust power and propulsive power

✓



A rocket engine for the combustion of its fuel_____________________?


acarries its own oxygen

✓


buses surrounding air

✖


cuses compressed atmospheric air

✖


ddoes not require oxygen

✖



Which of the following fuels can be used in turbojet engines _____________________?


aliquid hydrogne

✖


bhigh speed diesel oil

✖


ckerosene

✓


ddemethylated spirit

✖


View Answer kerosene

A jet engine works on the principle of conservation of____________________?


amass

✖


benergy

✖


cflow

✖


dlinear momentum

✓


View Answer linear momentum

Goto Page No.

Page 176 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