BDL MT Mechanical Mock Test - 3 Free Online Test 2026

• Tangential flow turbines: In this type of turbine, the water strikes the runner in the direction of the tangent to the wheel. Example: Pelton wheel turbine

• Radial flow turbines: In this type of turbine, the water strikes in the radial direction. Accordingly, it is further classified as:

Inward flow turbine: The flow is inward from the periphery to the centre (centripetal type)—example: old Francis turbine.

Outward flow turbine: The flow is outward from the centre to the periphery (centrifugal type)—example: Fourneyron turbine.

• Axial flow turbine: The water flow is parallel to the shaft axis—for example, direction arcine and propeller turbine.

• Mixed flow turbine: The water enters the runner in the radial direction and leaves in an axial direction. Example: Modern Francis turbine

In diesel engines, the self-ignition of the fuel happens due to compression. This is due to lower ignition delay, i.e., the time between rise in temperature and commencement of combustion.

This ability for self-ignition under compression is better expressed as cetane number. This is where alcohol lacks, having a very low cetane number and hence poor ignition upon compression.

An orifice meter provides a simpler and cheaper arrangement for the measurement of flow through a pipe. An orifice meter is essentially a thin circular plate with a sharp-edged concentric circular hole in it.

C_d is defined as the ratio of the actual flow and the ideal flow and is always less than one.

For the orifice meter, the coefficient of discharge C_d depends on the shape of the nozzle, the ratio of pipe to nozzle diameter, and the Reynolds number of the flow.

Centrifugal Force: The imaginary force which acts on the particle performing a circular motion in the direction away from the centre along the radius of the circular path having the same magnitude as that of centripetal force is called centrifugal force.

Metals: Iron, lead, gold, aluminium, platinum, uranium, zinc, lithium, sodium, tin, silver, etc.

Non-Metals: Hydrogen, helium, carbon, sulphur, nitrogen, oxygen, radon, neon, other halogens, and noble gases, etc.

The stiffness, k, of a body is a measure of the resistance offered by an elastic body to deformation. For an elastic body with a single degree of freedom (DOF) (for example, stretching or compression of a rod),

the stiffness is defined as

rm k = rmF/rmδ

where,

F is the force on the body

δ is the displacement produced by the force along the same degree of freedom

∴ The resistance of the material to deflection is known stiffness.

Lower pair: When the two elements of a pair have a surface contact when relative motion takes place, and the surface of one element slides over the surface of the other, the pair formed is known as the lower pair. Sliding pairs, turning pairs, and screw pairs are examples of lower pairs.

Higher pair: When the two elements of a pair have a line or point contact when relative motion takes place, and the motion between the two elements is partly turning and partly sliding, then the pair is known as higher pair. A pair of toothed gearing, belt and rope drives, ball and roller bearings, and cam and follower are examples of higher pairs.

In Belt and pulley, due to line contact, they form a higher pair.

1. U-tube differential manometer

2. Inverted U-tube differential manometer

• Otto Cycle is a gas power cycle that is used in spark-ignition internal combustion engines (modern petrol engines).
• Diesel cycle is a gas power cycle widely used in diesel engines.
• Brayton cycles are extensively used in gas turbine engines.

Note: For laminar flow between two fixed parallel plates

u_avg = 2u_max/3

According to Newton’s law of viscosity, τ = μ(du/dy) the shear stress is directly proportional to the rate of shear strain or rate of angular deformation of a fluid particle.

τ = μ(du/dy)

Calculation:

u = (y - y2)

du/dy = 1−2y

at y = 0.15

du/dy = 1−2(0.15) = 0.70

τ = μ(du/dy) = 0.8 × 0.7 = 0.56;N/m²

Note: 1 poise = 0.1 Ns/m²

The short circuit transfer mode is typically found in solid MIG or metal-cored wires when the ratio of Argon in the shielding gas is 75 to 85% Argon, and the welding voltage is low. In the globular transfer mode, the weld metal transfers across the arc in a gravity feed.

Artificial honey can be made. That is why the word 'natural' needs to be mentioned in the advertisement. So, I is implicit. No comparison is made of the prices of natural and artificial honey. So, II is not implicit. Nothing about the quality of honey of other companies can be deduced. So, III is also not implicit.

The statement mentions that such education can improve the employment situation. So, both I and II are implicit. Nothing about the aspect of revenue collection is mentioned in the statement. So, III is not implicit.

Hence after unfolding the given figure we get figure 2 as the correct unfolded figure.

Hence, option b is correct.

We can see that the pictures are perfectly mirrored here.

Hence option 1 is the correct answer.

The diagram above represents the best relation between Asia, India, and Australia.

After deleting all the even digits, the new arrangement is

8th digit from the right

3. Cascade

1. Cashier

2. Cassette

5. Casually

4. Casualty

Hence the correct sequence is 3, 1, 2, 5, 4.

Hence, the related word is Food.

or x² = 6 + x

or x² - x - 6 = 0

or (x-3) (x+2) = 0

ஃ x = 3 or x = -2

Since x is positive

ஃ x = 3

x 3 ↓ : ↓ x 3 ⟶ time

Length = 9m : 12m.

= 3 sec.

In passive voice the object is written before the subject. 

Object+ verb + subject

Thus the correct tense here is simple past 'was put up' as the tense in active voice is past . Option 3 is the correct answer.

In the sentence, 'except’ should be replaced by 'expect’. 'Except' means not including while 'expect' means 'await or to anticipate'. To convey the correct sense of the sentence, 'except’ should be used here.

The sentence is in active voice and needs to be transformed in passive voice.

The subject 'his colleagues' in the active voice will become the object in passive voice. And, similarly, the object in the active voice will become the subject in passive voice. Since the given sentence is in past tense, its passive voice will also be in the past tense. 

After exchanging the subject and object, the sentence becomes: He was accused of many offenses by his colleagues.

Here reporting verb is in the past tense, so the simple present tense will change to corresponding simple past tense. The pronoun ‘I’ will change to ‘she’, ‘today’ will change to ‘that day’. Thus, option 2 is correct.