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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Topicwise Question Bank for Mechanical Engineering  >  Test: Testing & Performance - 2 - Mechanical Engineering MCQ

Test: Testing & Performance - 2 - Mechanical Engineering MCQ


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10 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering - Test: Testing & Performance - 2

Test: Testing & Performance - 2 for Mechanical Engineering 2024 is part of Topicwise Question Bank for Mechanical Engineering preparation. The Test: Testing & Performance - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Testing & Performance - 2 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Testing & Performance - 2 below.
Solutions of Test: Testing & Performance - 2 questions in English are available as part of our Topicwise Question Bank for Mechanical Engineering for Mechanical Engineering & Test: Testing & Performance - 2 solutions in Hindi for Topicwise Question Bank for Mechanical Engineering course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Testing & Performance - 2 | 10 questions in 30 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Topicwise Question Bank for Mechanical Engineering for Mechanical Engineering Exam | Download free PDF with solutions
Test: Testing & Performance - 2 - Question 1
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A gasoline engine working on Otto cycle consumes 8 litres of gasoline per hour and develops 28 kW. The specific gravity of gasoline. is 0.75 and its calorific value is 44000 kJ/kg. The indicated thermal efficiency of the engine is

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Test: Testing & Performance - 2 - Question 2
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 In a variable speed SI engine, the maximum torque occurs at the maximum

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Test: Testing & Performance - 2 - Question 3
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In a variable speed SI engine

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Since power P = 
Hence power is directly proportional to speed.

Test: Testing & Performance - 2 - Question 4
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In an SI engine very high compression ratio cannot be used because
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By increasing the compression ratio, temperature and pressure of the end charge increases. Increase in temperature reduces the delay of the end charge which increases the knocking tendency of SI engine.

Test: Testing & Performance - 2 - Question 5
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The method of determination of indicated power of multi-cylinder SI engine is by the use of
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Morse test is used for determining indicated power in multi-cylinder engine from which friction power is calculated.

Test: Testing & Performance - 2 - Question 6
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Brake specific fuel consumption is expressed as
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Brake Specific Fuel Consumption

It is generally expressed in kg/kWh

Test: Testing & Performance - 2 - Question 7
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Morse test is applicable only to
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Morse test is used to determine indicated power for multi-cylinder engine.

Test: Testing & Performance - 2 - Question 8
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The dynamo in an automobile
Test: Testing & Performance - 2 - Question 9
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In the context of performance evaluation of IC Engine, match List-I (Parameter) with List-II (Equipment of measurement) and select the correct answer using the codes given below the lists:
List-I
A. Brake power (BHP)
B. Engine speed
C. Calorific value of fuel
D. Exhaust emission
List-II
1. Bomb calorimeter
2. Electrical tachometer
3. Hydraulic dynamometer
4. Flame ionization detector
Codes:
     A B C D
(a) 3 1  2 2
(b) 4 2  1 3
(c) 3 2  1 4
(d) 2 3 1  5
Detailed Solution for Test: Testing & Performance - 2 - Question 9

(i) Brake power → Hydraulic dynamo-meter
(ii) Engine speed → Electrical tachometer
(iii) Calorific value of fuel → Bomb calorimeter
(iv) Exhaust emission → Flame ionization detectors

Test: Testing & Performance - 2 - Question 10
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During a Morse test on a 4-cylinder engine, the following measurements of brake power were taken at constant speed.
All cylinders firing : 3037 kW
Number 1 cylinder not firing : 2102 kW
Number 2 cylinder not firing : 2102 kW
Number 3 cylinder not firing : 2100 kW
Number 4 cylinder not firing : 2098 kW
Q. The mechanical efficiency of the engine is
Detailed Solution for Test: Testing & Performance - 2 - Question 10

When cylinder 1 is not firing then power is 2102 kW and when all cylinders are firing then power is 3037 kW.
Hence power supplied by cylinder
No. 1 = 3037 - 2102 = 935 kW
Similarly power supplied by cylinder
No. 2 = 3037 - 2102 = 935 kW
Similarly power supplied by cylinder
No. 3 = 3037 - 2100 = 937 kW
Similarly power supplied by cylinder
No. 4 = 3037 - 2098 = 939 kW
Hence

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