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Practice Test: Mechanical Engineering (ME)- 9 - Mechanical Engineering MCQ


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30 Questions MCQ Test GATE Mechanical (ME) Mock Test Series 2025 - Practice Test: Mechanical Engineering (ME)- 9

Practice Test: Mechanical Engineering (ME)- 9 for Mechanical Engineering 2024 is part of GATE Mechanical (ME) Mock Test Series 2025 preparation. The Practice Test: Mechanical Engineering (ME)- 9 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Practice Test: Mechanical Engineering (ME)- 9 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Practice Test: Mechanical Engineering (ME)- 9 below.
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Practice Test: Mechanical Engineering (ME)- 9 - Question 1

Direction: Study the following pie-chart and tables carefully and answer the questions given below.
Total Number of email received by the organization = 90000

Ratio of Read emails to Unread emails received by the organization

What is the ratio of the number of emails read in January to those unread in the month of April in the organization?

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 1

Number of read emails in the month of January = (90000*17/100*8/15)
Number of unread emails in the month of April = (90000* 8/100 * 5/12)
Ratio = 68:25

Practice Test: Mechanical Engineering (ME)- 9 - Question 2

Direction: Two sentences with one blank in each, followed by five alternatives, are given. Choose that option as the answer which can fill both the blanks of both the sentences.
I. Most of our employees get _____ abroad at some stage
II. The aircraft and its crew were ______ missing.

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 2

Post means to send somebody to a place for a period of time as part of their job and to announce something publicly or officially.
Hence, option D is correct.

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Practice Test: Mechanical Engineering (ME)- 9 - Question 3

In the following question, out of the given four alternatives, select the one which is opposite in the meaning of the given word.
Scurrilous

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 3

The meanings of the given words are as follows:
Scurrilous— abusive
Coarse— rough or harsh in texture
Sophisticated— developed to a high degree of complexity.
Insolent— showing a rude and arrogant lack of respect
Complimentary— expressing a compliment; praising or approving
Clearly, option D is the antonym of the given word.

Practice Test: Mechanical Engineering (ME)- 9 - Question 4

Statements:
All pillows are beds.
No fruit is pillow.
Some foods are fruits.
Conclusions:
I. At least some foods are pillows.
II. Some beds are definitely fruits.

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 4

Consider the following least possible Venn diagram,

Conclusions:
I. At least some foods are pillows → it’s possible but not definite, hence false.
II. Some beds are definitely fruits → it’s possible but not definite, hence false.

Practice Test: Mechanical Engineering (ME)- 9 - Question 5

Direction: Study the following information carefully and answer the questions given below:
P, Q, R, S, T, U, V and F are sitting around a circle facing the centre. U is third to the right of Q, who is third to the right of F. P is third to the left of F. R is fourth to the left of P. T is third to the right of S. S is not a neighbour of P.
Four of the following five are similar in a certain way based on their positions in the seating arrangement and so form a-group. Which of the following does not belong to that group?

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 5


Option D does not belong the group.

Practice Test: Mechanical Engineering (ME)- 9 - Question 6

Following bar graphs shows time taken by different pipes to fill that particular percentage of tank which is described in tabular data. For Ex- Pipe 1 fills the 10 % of tank in 6 mins.
Now, read the following data and answer the question carefully:


A Tank has three pipes; two of them are used to fil the tank while another one used to empty the tank namely: pipe 3, pipe 5 to fill the tank and a third pipe for making the tank empty. When all three pipes are open, 7/18th part of the tank is filled in 1 hours. How much time will the third pipe take to empty the completely filled tank 10 times the bigger than the previous one.

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 6

part of work in one hour=
(P3+P5+Third pipE. X 1 = 7/18th part of work
⇒ 7/18th part of work = 1 hr
⇒ Total work done = 18/7 hr by all three pipes
Pipe 3 does 50% of work in 90 mins
100 % of work = 90/50 * 100 = 180 mins = 3 hr
Pipe 5 does 50% of work in 60 mins
100 % of work = 60/50 * 100 = 120 mins = 2 hr
Time Tw Efficiency
Pipe -3 = 3 hr Total work/3 = 6
Pipe-5 = 2 hr Total work/2 = 9
All three = 18/7 hr Total work/(18/7)= 7
For Total work = LCM of (3,2,18/7) = 18
Efficiency of pipe 3 + Efficiency of pipe 5 + Efficiency of third pipe = total efficiency
6+9+X= 7
X = 7-15 = -8 (Negative sign shows the negative work herE.
Efficiency X Time = Total work
8 X Time = 18 * 10 ( as tank is 10 times bigger than the previous onE.
Time = 180/8 = 22.5 hrs

Practice Test: Mechanical Engineering (ME)- 9 - Question 7

Directions: Rearrange the following six sentences (A), (B), (C), (D), (E) and (F) in the proper sequence to form a meaningful paragraph: then answer the questions given below them.

A). Indian Government remain concerned about potential spillover effects from the unconventional monetary policies of the advanced economies, which could cause disruptive volatility of exchange rates, asset prices and capital flows.
B). The challenges are related to high public debt and unemployment, poverty and inequality, lower investment and trade, negative real interest rates along with signs of prolonged low inflation in advanced economies.
C). In this context, emerging markets and developing countries (EMDCs) continue to be major drivers of global growth.
D). The global recovery continues, although growth remains fragile, with considerable divergences across countries and regions.
E). It is important to strengthen the framework of international financial cooperation, including through instruments such as swap-lines, to mitigate the negative impacts of monetary policy divergence in reserve currency issuing countries.
F). Structural reforms, domestic adjustment and promotion of innovation are important for sustainable growth and provide a strong and sustainable contribution to the world economy.
Which of the following will be the Second sentence?

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 7

Refer to the last question of the series.

Practice Test: Mechanical Engineering (ME)- 9 - Question 8

In a school, 12th class consists of 30% male students of which 30% male students failed in the class. Total 82% students passed in 12th examination out of 900 students. Calculate the total number of female passed students?

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 8

Short Trick:
Total students = 900
Boys : Girls = 30 % : 70% = 3 : 7
So, exactly Boys : Girls = 270 : 630
Total failed students = 18% of 900 = 162
Failed boys = 30% of 270 = 81
Failed girls = 162 - 81 = 81
Passed female students = 630 - 81 =549
Basic Method:

⇒ Let us consider total number of students be 100x
⇒ ∴ Males students = 30x , female students = 70x
⇒ According to condition given in the problem, of this 30x male students, 70 % male students pass the exam.

Practice Test: Mechanical Engineering (ME)- 9 - Question 9

Direction: In the following number series, only one number is wrong. Find out the wrong number.
17 25 34 98 121 339

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 9

The pattern followed here is,
⇒ 17 + 23 = 17 + 8 = 25
⇒ 25 + 32 = 25 + 9 = 34
⇒ 34 + 43 = 34 + 64 = 98
⇒ 98 + 52 = 98 + 25 = 123
⇒ 123 + 63 = 123 + 216 = 339

Practice Test: Mechanical Engineering (ME)- 9 - Question 10

There are 3 red balls and 5 green balls in a bag. If two balls are picked at random from the bag then find the probability of getting a red ball?

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 10

Required probability
=3C1*5C1/8C2
= 3*5/28
= 15/28

*Answer can only contain numeric values
Practice Test: Mechanical Engineering (ME)- 9 - Question 11

In the parallel-plate configuration shown, steady-flow of an incompressible Newtonian fluid is established by moving the top plate with a constant speed, U0 = 1m/s. If the force required on the top plate to support this motion is 0.75 N per unit area (in m2 ) of the plate then the viscosity of the fluid between the plates is __________ N-s/m2


Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 11

*Answer can only contain numeric values
Practice Test: Mechanical Engineering (ME)- 9 - Question 12

The figure shows reducing area conduit carrying water. The pressure p and velocity V are uniform across sections 1 and The density of water is 1000 kg/m3 . If the total loss of head due to friction is just equal to the loss of potential head between the inlet and the outlet, then V2 in m/s will be _____


Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 12

Practice Test: Mechanical Engineering (ME)- 9 - Question 13

The stress-strain curve of an ideal elastic strain hardening material will be as

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 13

The figure d is the stress-strain curve of an ideal elastic strain hardening material

Practice Test: Mechanical Engineering (ME)- 9 - Question 14

The strain hardening exponent ‘n’ of stainless steel relates to
N →column-1)
P) Zero
Q) between zero and one
R) One
Column-2
1) Plastic deformation
2) elastic solid
3) Perfect moldable solid

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 14

For n = 0 → Perfect moldable solid

O < n< 1 → Plastic deformation

n = 1 → elastic solid

Practice Test: Mechanical Engineering (ME)- 9 - Question 15

Mohr’s circle for the state of stress defined by  MPa. is a circle with radius of

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 15

*Answer can only contain numeric values
Practice Test: Mechanical Engineering (ME)- 9 - Question 16

Water flows through a tube of diameter 25mm at an average velocity 1 m/sec. The properties of water ρ = 1000 kg/m3, μ = 6x 10-4 N-s/m2 , K= 0.625 W/mK, Pr= 4, Given Dittus – Boelter equation, Nu =0.023Re0.8 Prn and constant heat flux Nu = 3.66. What is Nusset number when fluid is cooling?


Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 16

Given, Pr = 4, fluid is cooling so, n= 0.3

So the flow is turbulent, we have to use Dittus- Boelter equation i.e

*Answer can only contain numeric values
Practice Test: Mechanical Engineering (ME)- 9 - Question 17

A machine tool company decides to make four sub-assemblies through three contractors differing in efficiency. Given below are the estimates of the time in hours) matrix. The minimum time in seconds is?


Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 17

Here, we have three contractors to make four sub-assemblies. The problem is unbalanced, we have to add dummy column to make it balanced.


Subtracting by the smallest element of each column.
S→ M1
S→ M3
S→ M2

The minimum time is = 7+4+18 = 29 hour = 1740 seconds

*Answer can only contain numeric values
Practice Test: Mechanical Engineering (ME)- 9 - Question 18

The average service rate at a Service Centre is 8 customer/hr, which varies exponentially. Customers arrive at random order with an average of 6 customer/hr. The probability of at least 3 customers in the system is____


Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 18


At least 3 in system means 3 or more customers in system,

Practice Test: Mechanical Engineering (ME)- 9 - Question 19

In an Electrochemical machining process an iron( atomic weight=56 gm and valency=2) is used having cross section of 0.5x0.5 cm2. A current of 1000 A is passed through the electrolytic solution and the density of iron is given as 7.86gm/cm3. Find the feed rate of the electrode in cm/sec.

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 19


Practice Test: Mechanical Engineering (ME)- 9 - Question 20

A mould has downsprue whose length is 15cm and cross-section area at the base of downsprue is 1.5 cm2. The downsprue feeds a horizontal runner leading into mould cavity of 1200 cm2. The time required to fill the mould cavity will be

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 20

Length of sprue h= 15 cm = 0.15 m

Practice Test: Mechanical Engineering (ME)- 9 - Question 21

Match the following:
a) Drop forging i-material is only upset
b) Machine forging ii-repeated hammer blows
c) Press forging iii-carried out manually
d) Upset forging iv-squeezing action
e) Smith forging v-metal gripped & pressure applied at heated end

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 21

In Drop forging repeated hammer blows, for machine forging material is only upset, in press forging squeezing action takes place.

*Answer can only contain numeric values
Practice Test: Mechanical Engineering (ME)- 9 - Question 22

The maximum reduction (upto 2 decimal points) in cross-sectional area per pass (R) of a cold wire drawing process is R = 1 - e -(n+1) 
where n represents the strain hardening coefficient. For the case of a perfectly plastic material, R is


Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 22

Perfectly plastic material implies that strain hardening coefficient n is zero.
Hence

*Answer can only contain numeric values
Practice Test: Mechanical Engineering (ME)- 9 - Question 23

In spot welding of two stainless steel sheets, each of 5mm thickness, welding current 15000A is applied for 0.4sec, the heat dissipated to the base metal is 22000J . Assuming that the heat required for melting 2mm3 volume steel is 30J and contact resistance between sheets is 0.0004Ω. The volume (in mm3) of weld nugget is__________.


Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 23

Total heat generated = I2RT
= (15000)x 0.0004 x 0.4
=36000
Heat required to melt the nugget = 36000 -22000
=14000J
Volume of nugget = 14000/15 = 933.33 mm3

Practice Test: Mechanical Engineering (ME)- 9 - Question 24

Which of the following is false about comparator :

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 24

Comparators are more reliable as compare to other measuring method.

Practice Test: Mechanical Engineering (ME)- 9 - Question 25

Which types of stress strain relationship best describes the behaviour of brittle materials as ceramics and thermosetting plastics?

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 25

Ceramics and thermosetting plastics does not undergo plastic strain since they are brittle materials. The stress strain curve reached to the elastic point and then material fails.

Practice Test: Mechanical Engineering (ME)- 9 - Question 26

Gyroscopic acceleration is due to

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 26

Gyroscopic acceleration is due to the change in the direction of angular velocity.
So, the correct option is (b).

*Answer can only contain numeric values
Practice Test: Mechanical Engineering (ME)- 9 - Question 27

A paddle wheel is rotated inside a sealed container containing 20kg of air. If the applied torque on paddle wheel is 80Nm and is rotated at 120rpm for 3 minutes. The temperature rise of air is ________ ℃


Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 27

Using energy balance,

Practice Test: Mechanical Engineering (ME)- 9 - Question 28

According to second law of thermodynamics, the entropy change of the system for any process can be

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 28

We know that

 is always a positive value and 0 for reversible process.
can be +ve or –ve depending upon heat addition and heat release respectively. So, the correct option is (d).

Practice Test: Mechanical Engineering (ME)- 9 - Question 29

The Mollier diagram of a pure substance is a

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 29

The Mollier diagram of a pure substance is a h-s diagram. So, the correct option is (a).

Practice Test: Mechanical Engineering (ME)- 9 - Question 30

Match List-1 (Refrigerant) with List-2 (Uses) and select the correct answer using the code given below the List

Detailed Solution for Practice Test: Mechanical Engineering (ME)- 9 - Question 30


So, the correct option is (c).

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