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# Engine Friction, Lubrication And Cooling - 1

## 10 Questions MCQ Test Mock Test Series - Mechanical Engineering (ME) for GATE 2020 | Engine Friction, Lubrication And Cooling - 1

Description
This mock test of Engine Friction, Lubrication And Cooling - 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 10 Multiple Choice Questions for Mechanical Engineering Engine Friction, Lubrication And Cooling - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Engine Friction, Lubrication And Cooling - 1 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Engine Friction, Lubrication And Cooling - 1 exercise for a better result in the exam. You can find other Engine Friction, Lubrication And Cooling - 1 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

### The heat given to cooling medium in IC engines is about

Solution:

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.

QUESTION: 2

Solution:

QUESTION: 3

### Which part of the piston is subjected to maximum temperature ?

Solution:

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

QUESTION: 4

The peak cylinder gas temperature is of the order of

Solution:
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

Solution:
QUESTION: 6

Thermostat is used in radiators to

Solution:

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.

QUESTION: 7

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

Solution:
QUESTION: 8

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

Solution:

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.

QUESTION: 9

A fan is provided in the water cooling system to

Solution:

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

QUESTION: 10

Direct system of cooling air in one in which

Solution:

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.