Home
Current Affairs January 2024

What is the correct answer?

4

If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to

A. P1 - P2

B. P1 + P2

C. 2 × (P1 + P2)

D. [2 × (P1 + P2)] + Pc Where Pc is centrifugal tension

Correct Answer :

C. 2 × (P1 + P2)


Related Questions

What is the correct answer?

4

According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

A. 45 to 60 %

B. 63 to 70 %

C. 70 to 83 %

D. 80 to 90 %

What is the correct answer?

4

Spring index is

A. Ratio of coil diameter to wire diameter

B. Load required to produce unit deflection

C. Its capability of storing energy

D. Indication of quality of spring

What is the correct answer?

4

The radial distance of a tooth from the pitch circle to the top of the tooth is called

A. Addendum

B. Dedendum

C. Clearance

D. Working depth

What is the correct answer?

4

If a material fails below its yield point, failure would be due to

A. Straining

B. Fatigue

C. Creep

D. Sudden loading

What is the correct answer?

4

If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio.

A. Increases

B. Decreases

C. Remains unchanged

D. None of these

What is the correct answer?

4

In the levers of third type, the mechanical advantage is __________ one.

A. Less than

B. Equal to

C. More than

D. None of these

What is the correct answer?

4

Which of the following statement is wrong?

A. A key is used as a temporary fastening

B. A key is subjected to tensile stresses

C. A key is always inserted parallel to the axis of the shaft

D. A key prevents relative motion between the shaft and boss of the pulley

What is the correct answer?

4

When the belt is transmitting maximum power,

A. The tension in tight side is twice the centrifugal tension

B. The tension in slack side is equal to the centrifugal tension

C. The tension in tight side is thrice the centrifugal tension

D. None of the above

What is the correct answer?

4

The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

A. 0.45

B. 0.55

C. 0.65

D. 0.75

What is the correct answer?

4

The piston pin bearings in heavy duty diesel engines are

A. Needle roller bearings

B. Tapered roller bearings

C. Spherical roller bearings

D. Cylindrical roller bearings

What is the correct answer?

4

When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

A. Brown colour

B. Yellow colour

C. White colour

D. Grey colour

What is the correct answer?

4

A crankshaft is a __________ shaft.

A. Transmission

B. Machine

C. Machine frame

D. None of these

What is the correct answer?

4

According to I.B.R., the factor of safety of riveted joint should not be less than

A. 1

B. 2

C. 3

D. 4

What is the correct answer?

4

The sleeve or muff coupling is designed as a

A. Dun cylinder

B. Hollow shaft

C. Solid shaft

D. Thick cylinder

What is the correct answer?

4

In a transverse fillet welded joint, the size of weld is __________ the throat of weld.

A. 0.5 times

B. Equal to

C. 2 times

D. Double

What is the correct answer?

4

A transmission shaft includes

A. Over head shaft

B. Counter shaft

C. Line shaft

D. All of these

What is the correct answer?

4

Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

A. F + P

B. F P

C. P

D. F

What is the correct answer?

4

According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

A. d = t

B. d = 1.6 t

C. d = 2t

D. d = 6t

What is the correct answer?

4

In hydrostatic bearings

A. The Oil film pressure is generated only by the rotation of the journal

B. The oil film is maintained by supplying oil under pressure

C. Do not require external supply of lubricant

D. Grease is used for lubrication

What is the correct answer?

4

Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

A. Dynamic loading

B. Static loading

C. Combined static and dynamic loading

D. Completely reversed loading

What is the correct answer?

4

When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A. Bending stress only

B. A combination of torsional shear stress and bending

C. Direct shear stress only

D. A combination of bending stress and direct shear stress

What is the correct answer?

4

Tapered roller bearings can take

A. Axial load only

B. Both radial and axial loads and the ratio of these being greater than unity

C. Radial load only

D. Both radial and axial loads and the ratio of these being less than unity

What is the correct answer?

4

The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

A. Working depth

B. Clearance

C. Backlash

D. Face width

What is the correct answer?

4

The lower deviation is the algebraic difference between the

A. Actual size and the corresponding basic size

B. Maximum limit and the basic size

C. Minimum limit and the basic size

D. None of the above

What is the correct answer?

4

According to maximum shear stress theory, the maximum shear stress in the shaft is

A. (1/2) × √(σ² + 4τ²)

B. √(σ² + 4τ²)

C. (1/2) × [σ + √(σ² + 4τ²)]

D. σ + √(σ² + 4τ²)

What is the correct answer?

4

The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

A. It is subjected to a higher cyclic loading than the outer side

B. It is subjected to a higher stress than the outer side

C. It is more stretched than the outer side during the manufacturing process

D. It has a lower curvature than the outer side

What is the correct answer?

4

Set screws are

A. Similar to small size tap bolts except that a greater variety of shapes of heads are available

B. Slotted for a screw driver and generally used with a nut

C. Used to prevent relative motion between parts

D. Similar to stud

What is the correct answer?

4

The belt slip occurs due to

A. Heavy load

B. Loose belt

C. Driving pulley too small

D. Any one of the above

What is the correct answer?

4

The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

A. Gerber relation

B. Soderberg relation

C. Goodman relation

D. None of these

What is the correct answer?

4

18/8 steel contains

A. 18% nickel and 8% chromium

B. 18% chromium and 8% nickel

C. 18% nickel and 8% vanadium

D. 18% vanadium and 8% nickel