# Cooling System MCQ Questions & Answers

Cooling System MCQs : This section focuses on the "Cooling System". These Multiple Choice Questions (MCQs) should be practiced to improve the Cooling System skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

What would be the quantity of water to be circulated through the radiator, if diesel tractor developed 40 KW with a coolant temperature difference of 5.5°C?

A. 4.26 lps
B. 4.19 lps
C. 2.86 lps
D. 3.72 lps

Question 2

What is the temperature dropping in the radiator of a tractor when the flow rate of water is 0.16 litre per second per KW?

A. 8.5°C to 5.5 °C
B. 11°C to 10 °C
C. 20°C to 15 °C
D. 12.75 °C to 9.79°C

Question 3

A capillary tube has a diameter of 3 mm and 100 mm length. A head of 10 cm of oil above the inlet of the capillary maintains a pressure difference across the capillary. The specific gravity of oil is 0.92. A volume of 300 cm3 of oil passes through the in 10s. What will be the viscosity of oil?

A. 5.68 * 10-4 poise
B. 5.98 * 10-4 poise
C. 5.68 * 10-5 poise
D. 5.98 * 10-5 poise

Question 4

At what temperature does the thermostats fully open?

A. 36°C
B. 98°C
C. 82°C
D. 42°C

Question 5

Who invented the automobile water radiator?

A. Wilhelm Maybach
B. Karl Benz
C. Elon Musk
D. Alfred Noble

Question 6

What is the maximum permissible V-belt sag?

A. 15 mm
B. 20 mm
C. 10 mm
D. 18 mm

Question 7

What is the melting point of Platinum?

A. 1750°C
B. 2050°C
C. 850°C
D. 750°C

Question 8

What output do the engines reject running at a speed of 2000 rpm and at full load condition using gasoline?

A. 0.75 KW
B. 0.89 KW
C. 0.23 KW
D. 0.44 KW

Question 9

What is the formula for Newton's law of cooling?

A. $$\frac{dÎ¸}{dt}$$ = KA (Î¸-Î¸0)
B. $$\frac{dÎ¸}{dt}$$ = KA (Î¸+Î¸0)
C. $$\frac{dÎ¸}{dt}$$ = KA (Î¸*Î¸0)
D. $$\frac{dÎ¸}{dt}$$ = KA (Î¸/Î¸0)

Question 10

What is the range of best operating rating temperature of I.C. engine?

A. 106°F - 120°F
B. 140°F - 200°F
C. 106°F - 200°F
D. 120°F - 140°F

Question 11

What is the temperature of burning gases in the engine?

A. 3000-4000°C
B. 1500-2000°C
C. 11000-12000°C
D. 9000-10000°C

Question 12

What is the temperature of water in a closed radiator under high pressure?

A. 319°F
B. 123°F
C. 264°F
D. 243°F

Question 13

What are the different temperatures at which thermostats fully opens for petrol and diesel engine respectively?

A. 106°C;120°C
B. 89°C;98°C
C. 82°C;90°C
D. 100°C;102°C

Question 14

A body cools from 70°C to 40°C in 5 minutes at surrounding temperature of 10°C. How long will it take for the body to cool from 49°C to 25°C?

A. 4.3 minutes
B. 6.5 minutes
C. 3.3 minutes
D. 1.8 minutes

Question 15

What amount of washing soda and kerosene oil should be added in water to make a solution to clean the cooling system?

A. 2 kg water and 0.5 kg kerosene oil
B. 2.5 kg water and 1.5 kg kerosene oil
C. 1 kg water and 0.5 kg kerosene oil
D. 1.5 kg water and 2.5 kg kerosene oil

Question 16

Which of the following is not a method of water cooling?

A. Open jacket or hopper method
B. Open flame method
C. Thermosiphon method
D. Forced circulation method

Question 17

A diesel tractor develops 60 KW with a coolant temperature difference 5.5°C. What will be the quantity of water to be circulated through the radiator?

A. 3.72 l/s
B. 5.56 l/s
C. 9.88 l/s
D. 11.10 l/s