M C Q s D r i v e
About
Contact

Contact Info

Ad Banner

Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

thumb

Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?
A the friction is high
B the friction is unpredictable
C the small difference in cooling water temperature or in internal friction has a disproportionate effect
D the engine is rarely operated
Correct Answer: the small difference in cooling water temperature or in internal friction has a disproportionate effect
A heat engine utilises the_________________?
A calorific value of oil
B low heat value of
C high heat value of oil
D mean heat value of oil
Correct Answer: high heat value of oil
The rating of a diesel engine, with increase in airintlet temperature, will ___________________?
A increase linearly
B decrease linearly
C increase parabolically
D decrease parabolically
Correct Answer: decrease linearly
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of____________________?
A 250°C
B 500°C
C 1000°C
D 150CPC
Correct Answer: 1000°C
In a typical medium speed, 4-stroke cycle diesel engine ___________________?
A fuelinjection starts at 10° before to dead center and ends at 20° after tor dead center
B fuel injection starts at top dead center and ends at 20° after top dead center
C fuel injection starts at just before top dead center and ends just after top deac center
D may start and end anywhere
Correct Answer: fuelinjection starts at 10° before to dead center and ends at 20° after tor dead center
Which of the following medium is compressed in a Diesel engine cylinder __________________?
A air aione
B air and fuel
C air and lub oil
D fuel alone
Correct Answer: air aione
As a result of detonation in an I.C. engine, following parameter attains very high value _____________________?
A peak pressure
B rate of rise of pressure
C rate of rise of temperature
D peak temperature
Correct Answer: rate of rise of pressure
Most high speed compression engines operate on __________________?
A Diesel cycle
B Otto cycle
C Dual combustion cycle
D Special type of air cycle
Correct Answer: Dual combustion cycle
For the same compression ratio_____________________?
A Otto cycle is more efficient than the Diesel
B Diesel cycle is more efficient’than Otto
C both Otto and Diesel cycles are, equally efficient
D compression ratio has nothing to do with efficiency
Correct Answer: Otto cycle is more efficient than the Diesel
It the temperature of intake air in IC engines is lowered, then its efficiency will_______________________?
A increase
B decrease
C remain same
D increase upto certain limit and then decrease
Correct Answer: increase

Copyright @ 2026 . All Rights Reserved.