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21
Engine cranks do no start during winter because of
1. Battery discharge
2. Weak spark
3. Worn out engine
4. Lean mixture
Discuss
Answer & Solution
Answer: Option D
Solution:
Engine cranks may not start during winter due to several factors that affect engine performance in cold conditions.

Battery Discharge: Cold weather can lead to the discharge of the battery, making it difficult for the engine to crank properly as the battery loses power more quickly in lower temperatures.

Weak Spark: A weak spark occurs when the spark plugs fail to generate enough energy to ignite the fuel mixture in cold conditions, preventing the engine from starting.

Lean Mixture: In cold weather, the air-fuel mixture may become lean (more air, less fuel), which makes it difficult for the engine to start since more fuel is required to ignite in cold conditions.

Thus, the correct answer is 4, 1 and 2 are correct.
22
The device for smoothing out the power impulses from the engine is called
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
23
The tractive effort increases if the wheel diameter is
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
24
If BP of a four-stroke petrol engine is 28 kW and mechanical efficiency is 80%, then IP is . . . . . . . . .
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
25
The main purpose of inspection is-
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
26
The testing equipment which gives a very close approximation of a road test in garage is called
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
27
Morse test is carried out to determine the IP of a . . . . . . . .
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Answer & Solution
Answer: Option C
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28
Which one of the following method for determination of engine friction is only applicable for diesel engines and also the gross fuel consumption is plotted against brake power and it is extended backwards to zero fuel consumption?
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Answer & Solution
Answer: Option D
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29
High performance sports car with active exhaust system allows . . . . . . . .
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Answer & Solution
Answer: Option A
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30
The ratio of brake power to indicated power of an IC engine is called
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Answer & Solution
Answer: Option A
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