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Test: Engine Friction, Lubrication & Cooling - 1 - Mechanical Engineering MCQ


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10 Questions MCQ Test - Test: Engine Friction, Lubrication & Cooling - 1

Test: Engine Friction, Lubrication & Cooling - 1 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Test: Engine Friction, Lubrication & Cooling - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Engine Friction, Lubrication & Cooling - 1 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Engine Friction, Lubrication & Cooling - 1 below.
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Test: Engine Friction, Lubrication & Cooling - 1 - Question 1

The heat given to cooling medium in IC engines is about

Detailed Solution for Test: Engine Friction, Lubrication & Cooling - 1 - Question 1

IC engines at best can transform about 25 - 35% of chemical energy into mechanical energy. About 35% of heat generated is lost to the cooling medium, remainder being dissipated through exhaust and lubricating oil.

Test: Engine Friction, Lubrication & Cooling - 1 - Question 2

Gas temperature variation inside the engine cylinder during a cycle is minimum during

Detailed Solution for Test: Engine Friction, Lubrication & Cooling - 1 - Question 2

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Test: Engine Friction, Lubrication & Cooling - 1 - Question 3

Which part of the piston is subjected to maximum temperature ?

Detailed Solution for Test: Engine Friction, Lubrication & Cooling - 1 - Question 3

Maximum temperature: At the center of piston crown.
Minimum temperature: At the bottom of oiston skirt.

Test: Engine Friction, Lubrication & Cooling - 1 - Question 4

The peak cylinder gas temperature is of the order of

Test: Engine Friction, Lubrication & Cooling - 1 - Question 5

Match List-I (Cooling system) with List-ll (Application) the following:
​List-I
A. Air cooled system
B. Evaporative cooling system
C. Forced circulation cooling system
D. Thermosyphon system

List-ll
1. Small output engine
2. Automobile engine
3. Small & medium sized engines
4. Stationary engin

Test: Engine Friction, Lubrication & Cooling - 1 - Question 6

Thermostat is used in radiators to 

Detailed Solution for Test: Engine Friction, Lubrication & Cooling - 1 - Question 6

A thermostat prevents the circulation of water below a certain temperature through the radiator so that the water gets heated, in modern engines, a wax-element type thermostat is normally employed.

Test: Engine Friction, Lubrication & Cooling - 1 - Question 7

What approximate percentage of heat of combustion is lost to the jacket cooling water?

Test: Engine Friction, Lubrication & Cooling - 1 - Question 8

In the automobile water cooling system, the thermostat comes into operation at about

Detailed Solution for Test: Engine Friction, Lubrication & Cooling - 1 - Question 8

The thermostat allows the water to go to the radiator only when the water has been raised to a pre-determined temperature of about 80 - 85° C. If the temperature of water is less, it is by passed to the pump.

Test: Engine Friction, Lubrication & Cooling - 1 - Question 9

A fan is provided in the water cooling system to

Detailed Solution for Test: Engine Friction, Lubrication & Cooling - 1 - Question 9

It draws air through the spaces between the radiator tubes to bring down the water temperature appreciably.

Test: Engine Friction, Lubrication & Cooling - 1 - Question 10

Direct system of cooling air in one in which

Detailed Solution for Test: Engine Friction, Lubrication & Cooling - 1 - Question 10

It is used where plenty of water is available. The water from a storage tank is directly supplied through an inlet valve to the engine cooling water jacket. The hot water is not cooled for re-use but simply discharged. It is also known as nonreturn system.

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