HPCL Mechanical Engineer Mock Test - 7 - Mechanical Engineering MCQ

Repeal: To revoke or annul a law, regulation, or decision, typically through official or legislative means.

1. Sanction:

   • As a verb: to give official permission or approval for an action.
   • As a noun: a penalty or measure taken against someone who has violated a rule or law.

2. Perpetuate: To make something continue indefinitely; to sustain or prolong.

3. Pass:

   • As a verb: to approve or adopt a proposal or legislation.
   • As a noun: a successful attempt to achieve something; also, a document or ticket granting authorization or access.

4. Cancel: To revoke or annul something previously scheduled, arranged, or agreed upon; to declare null and void.

Correct option D

When used as verbs, admonish means to warn or notify of a fault, whereas reprimand means to reprove in a formal or official way. Reprimand is also noun with the meaning: a severe, formal or official reproof.

Let AB be the light house and the two boats be at C and D

∴ AB = 125 m

tan30° = BC/AB = x/125 = 1/3

=> x = 72.17 m

tan45° = BD/AB = y/125 = 1

=> y = 125 m

∴ The distance between the two boats is = x + y

= 72.17 + 125

= 197.17 m

Given,
first factorise 45 = 3² x 5¹
[3^(x-3)] 5^(x-4) = 45 = 3² (5¹)
On comparing both sides we get,
x-3 = 2 and x-4 = 1
By solving we get
=> x = 5
Hence, option A is the correct answer.

Area of Trapezium  = 1/2 (sum of Parallel sides ) * height
let a and b are the parallel sides:
a= 4cm
b= 6 cm
h= 3cm
according to formula -> 1/2(4+6)*(3)
=>1/2(10)(3)
=>30/2
=>15 cm²

Reqd. distance = 5.50 × 36 = 198 km
Hence, Option C is correct.

As 25 = (5)² → (5 + 1)² + 1 = 37.

As 49 = (7)² → (7 + 1)² + 1 = 65.

From the final arrangement, we get “C sits at one of the extreme ends".
Hence, Option D is correct.
References:
O sits 3^rd to the right of N.
One who sits just behind O is to the immediate right of E.
Inferences:
From the above reference, we get the following cases:

References:
B is neither at any of the extreme ends nor sits exactly behind O.
The number of people sitting between C and E, is the same as the number of people sitting between E and B.
Inferences:
From the above reference, we get the following cases:

References:
D doesn’t sit at any of the extreme ends.
P sits on a seat which is exactly ahead of A.
M is not exactly ahead of E.
Inferences:
From the above reference, we get the following cases:
Case 1: Position of D cannot be fixed, thus this case is eliminated.

Case 2: We get the final arrangement as below:

Given:

(a + b) : (b + c) : (c + a) = 6 : 7 : 8

a + b + c = 14

Calculaiton:

(a + b) = 6k

(b + c) = 7k

(c + a) = 8k

⇒ 2(a + b + c) = 21k

⇒ 21k = 2 × 14

⇒ 21k = 28

⇒ k = 4/3

⇒ c + a = 8 × 4/3

⇒ c + a = 32/3

As given,

⇒ b + 32/3 = 14

⇒ 3b + 32 = 42

⇒ 3b = 10

∴ b = 10/3

Hence, the above image is the correct answer.

The pattern followed here is:

The positional value of the letter is given as their code.

Given code:

PASS → 1611919

Similarly,

Thus ASAP → 119116

Hence, the correct answer is "119116".

As the young one of a 'cat' is 'kitten' in the same way the young one of 'woman' is 'baby'.

Given expression,

84% of 9600 + 48% of 6900 = ? + 50% of 2000

⇒ (84/100) × 9600 + (48/100) × 6900 = ? + (50/100) × 2000

⇒ 84 × 96 + 48 × 69 = ? + 50 × 20

⇒ 8064 + 3312 = ? + 1000

⇒ 11376 = ? + 1000

⇒ ? = 11376 - 1000 = 10376

The pattern followed is:

Hence, the correct answer is "110".

The relation between the numbers is as follows:

72 - 56 = 16

56 - 42 = 14

42 - 30 = 12

30 - 20 = 10

20 - 12 = 8

Thus , the number which complete the series is 12.

1- The column will be initially perfectly straight, and load will be applied axially.

2- The material of the column will be homogenous and isentropic.

3- Column material must be stressed within its elastic limit, and therefore column material must follow the principle of Hooke’s law.

4- Direct stress developed in the column will be very small as compared with the bending stress.

5- The length of the column will be very large as compared with other dimensions of the column, i.e., the length of the column will be very large as compared with lateral dimensions of the column.

6- Self-weight of the column will be negligible i.e., Euler had neglected the own weight of the column

7- Column will fail by buckling alone

8- Cross-section of the column will remain uniform throughout the length of the column.

In the case of the bi-axial state of normal stresses:

Normal stress on an inclined plane:

Shear Stress on an inclined plane:

Normal stress on 45° plane:

The backing is usually made of a dielectric (usually plastic) which provides good electrical insulation between the wires of the strain gauge and the specimen. Polyimide is the prevalent backing material and is thus the default standard. No extreme operating conditions such as high temperatures are present.

The transition temperature corresponds to the combination of Nickel (Ni) and Chromium (Cr). These elements play a significant role in determining the transition temperature of a material. While Molybdenum (Mo) and Tungsten (W) are also important elements in materials science, they are not directly associated with the transition temperature in this context. Therefore, the correct answer is C: Ni and Cr.

A throttling process is a thermodynamic process in which the enthalpy of the gas or medium remains constant (h = const). In fact, the throttling process is one of the isenthalpic processes. On the other the throttling process cannot be isentropic; it is a fundamentally irreversible process.