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Practice Test: Mechanical Engineering (ME)- 3 - Mechanical Engineering MCQ


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30 Questions MCQ Test - Practice Test: Mechanical Engineering (ME)- 3

Practice Test: Mechanical Engineering (ME)- 3 for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Practice Test: Mechanical Engineering (ME)- 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Practice Test: Mechanical Engineering (ME)- 3 MCQs are made for Mechanical Engineering 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Practice Test: Mechanical Engineering (ME)- 3 below.
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Practice Test: Mechanical Engineering (ME)- 3 - Question 1

Choose the word or phrase which is nearest in meaning to the key word Lethargy

Practice Test: Mechanical Engineering (ME)- 3 - Question 2

The following question comprise two words that have a certain relationship between them followed by four pairs of words. Select the pair that has same relationship as the original pair of words.
Break : Piece

Practice Test: Mechanical Engineering (ME)- 3 - Question 3

Replace the phrase printed in bold to make it grammatically correct ?
"Even though many companies" are now penetrating rural India, it would help to give India a real chance of witnessing a double digit GDP growth.

Practice Test: Mechanical Engineering (ME)- 3 - Question 4

Which one of the following represents open thermodynamic system?

Practice Test: Mechanical Engineering (ME)- 3 - Question 5

What is the deformation or dynamic factor if sum of errors on meshing teeth of steel pinion and gear is 32 x 10-3 mm?

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 5

For steel and pinion gears tooth form factor (K) is 0.111 and modulus of elasticity for pinion and gear is 207 x 103 N/mm2.

Substituting these values in formula for deformation factor

 

C = K.e [(Ep x Eg ) / (Ep + Eg )]

C = 11500e

 

Therefore substituting value of e = 32 x 10-3, we get

C = 368 N/mm

Practice Test: Mechanical Engineering (ME)- 3 - Question 6
Chirag decided to give 12% of his salary to his younger brother as a pocket money. But he gave 1260 Rs which was 60% of what he had decided earlier. How much is Chirag’s salary?
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 6
Let x be Chirag’s salary:

x = 17500 Rs
Practice Test: Mechanical Engineering (ME)- 3 - Question 7
Two pipes can fill a tank in 15 minutes and 25 minutes respectively. Both the pipes are opened together and after some time, the first pipe is closed and the tank is completely full in 15 minutes. For how many minutes is the first pipe opened?
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 7

t = 6 min
Practice Test: Mechanical Engineering (ME)- 3 - Question 8
A and B are required to solve a problem independently. If 1/2 and 1/3 are their respectively probabilities of solving the problem, then the probability that atleast one of them solves the problem.
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 8
Probability that atleast one of them solves the problem = P
Practice Test: Mechanical Engineering (ME)- 3 - Question 9
What is the probability that a leap year has 53 Sundays and 52 Mondays?
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 9
In leap year there are 366 days.
There are 52 weeks + 2 days
1. - Mon. + Tue.
2. - Tue. + Wed.
3. - Wed. + Thu.
4. - Thu. + Fri.
5. - Fri. + Sat.
6. - Sat. + Sun. = 53 Sundays + 52 Mondays
7. - Sun. + Mon.
Probability =1/7
Practice Test: Mechanical Engineering (ME)- 3 - Question 10
A certain sum of money is invested for one year at a certain rate of simple interest. If the rate of interest is 3% higher, then the interest earned will be 25% more than the interest earned earlier. What is the earlier rate of interest ?
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 10

r = 12% per annum
Practice Test: Mechanical Engineering (ME)- 3 - Question 11
The value of is
Practice Test: Mechanical Engineering (ME)- 3 - Question 12
Suppose  f(x) = If  f(x) = f(1), the possible values of a and b are
Practice Test: Mechanical Engineering (ME)- 3 - Question 13
On her vacations, Katrina visits four cities (A, B, C and D) in a random order. The probability that she visits A either first or second place is
Practice Test: Mechanical Engineering (ME)- 3 - Question 14
The inverse Laplace transform of   
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 14
Using partial fractions, we can write

Taking Inverse Laplace
Practice Test: Mechanical Engineering (ME)- 3 - Question 15
The equation has
Practice Test: Mechanical Engineering (ME)- 3 - Question 16

A work piece of 150 cm length and 40 cm width is machined by planning operation with a feed of 0.3 mm/stroke. The machine tool executes 10 double strokes/min. The planning time (in min) for a single pass is

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 16

Feed per minute = 0.3 × 10 = 3 mm
Time taken = 400/3 = 133.33 min

Practice Test: Mechanical Engineering (ME)- 3 - Question 17
Which one of the following is the correct relationship between the boundary layer thickness d, displacement thickness and the momentum thickness q?
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 17
Practice Test: Mechanical Engineering (ME)- 3 - Question 18
Using Johnsons' rule, find the optimal sequence
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 18

4 - 1 - 3 - 2 – 5
Practice Test: Mechanical Engineering (ME)- 3 - Question 19

The maximum interference in mm after assembly between a bush of size 30+0.06+0.03 and a shaft of size 30+0.04+0.02 is

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 19


 

Practice Test: Mechanical Engineering (ME)- 3 - Question 20

In a gas turbine operating on Brayton cycle with intercooling
1. Efficiency of cycle increases
2. Work ratio increases
3. Compressor work decreases
Which of the above statements are true

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 20

In a gas turbine operating on the Brayton cycle with intercooling, the effects of intercooling are as follows:

  1. Efficiency of the cycle increases: True. Intercooling reduces the temperature of the compressed air between stages, which decreases the amount of work required by the compressor and results in improved overall cycle efficiency. The compression work is reduced, allowing more energy for the expansion process, which boosts efficiency.

  2. Work ratio increases: True. With intercooling, the compressor work decreases, and as a result, the ratio of work output from the turbine to the work input to the compressor (the work ratio) increases.

  3. Compressor work decreases: True. Intercooling reduces the temperature and, consequently, the volume of the compressed air, which reduces the compressor work required for the same pressure ratio.

 

So, all three statements are true.

Practice Test: Mechanical Engineering (ME)- 3 - Question 21

A glass plate at  40°C is heated by passing hot air over it with a convection co-efficient of 18 W/m2 K. If the temperature change over the thickness is not to exceed 5°C  to avoid damage, the maximum allowable temperature (°C)  of the air will be. (Thermal conductivity of the plate matrial is 1.9 W/mK.). Thickness of plate is 1 mm.

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 21

To calculate the DC component of the periodic signal x(t)x(t), we find the average value over one period T₀:

Step 1: Formula for DC Component
The DC component (average value) is given by:
DC = (1/T₀) * ∫ x(t) dt over one period.

Step 2: Signal Analysis
The signal x(t)x(t):

  • x(t)=1x(t) = 1 for |t| < T₁.
  • x(t)=0x(t) = 0 for T₁ < |t| < T₀/2.

Integral Calculation

Since x(t)=1x(t) = 1 only between −T1-T₁ and T1T₁, integrate only over this range:
DC = (1/T₀) * ∫ (from -T₁ to T₁) 1 dt.

The integral of 1 over −T1-T₁ to T1T₁ is:
(T₁ - (-T₁)) = 2T₁.

Step 3: Final Result
DC = 2T₁ / T₀.

Correct Answer: (c) 2T₁ / T₀.

Practice Test: Mechanical Engineering (ME)- 3 - Question 22
Flow separation is caused by
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 22
Positive pressure gradient is adverse pressure gradient which causes flow separation
Practice Test: Mechanical Engineering (ME)- 3 - Question 23
A single radial ball bearing of base diameter of 55 mm and subject to a radial load of 22 kN. The shaft rotates at 600 rpm. assume f = 0.0015 The frictional torque in N.m. is
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 23

= 0.9075 Nm
Practice Test: Mechanical Engineering (ME)- 3 - Question 24

During a non-flow isothermal reversible expansion, 1 kmol of O2 at 350 k expands from 0.06 m3/kg to 0.15 m3/kg Use Vander waals equation to determine Final pressure of gas

(a = 139.35 x 103, b = 0.0314 m3 k mol-1)

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 24
 

 

  • For a non-ideal gas, use the Van der Waals equation:

    (P + a(n/V)²)(V - nb) = nRT

  • Given:

    • n = 1 kmol

    • V = 0.15 m3 kg-1 x 32 kg/kmol = 4.8 m3

    • T = 350 K

    • a = 139.35 x 103 m6 Pa mol-2

    • b = 0.0314 m3 kmol-1 

    •  
  • Calculate pressure (P):

    • (P + (139.35 x 103 / 4.8²))(4.8 - 0.0314) = 1 x 8.314 x 350

    • Solve for P: P ≈ 6.04 bar 

    •  
  • Correct answer: B (6.04 bar)
Practice Test: Mechanical Engineering (ME)- 3 - Question 25
During a non-flow isothermal reversible expansion, 1 kmol of at 350 k expands from 0.06 to 0.15 .Use Vander waals equation to determine
Work done during process
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 25

Practice Test: Mechanical Engineering (ME)- 3 - Question 26
Equation of motion for single degree of freedom system is Where x is displacement from mean position. Which of following is true
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 26

Practice Test: Mechanical Engineering (ME)- 3 - Question 27
In a pure rolling the draft is increased by 100% and diameter of the roll is also increased by 100%. The bite will increase by
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 27

Practice Test: Mechanical Engineering (ME)- 3 - Question 28
Rod of length l slides down along the inclined wall as shown. At the instant shown, the speed of end A is v, then the speed of B will be:-
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 28
Components of velocity along rod:-
Practice Test: Mechanical Engineering (ME)- 3 - Question 29
Given
Max Subject to

It will give
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 29

So, it is unbounded solution
Practice Test: Mechanical Engineering (ME)- 3 - Question 30
The mechanical efficiency of a single cylinder four stroke engine is 80%. If the break power is estimated to 100 KW, the frictional power will be
Detailed Solution for Practice Test: Mechanical Engineering (ME)- 3 - Question 30
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