Which of the following are not true for petroff’s equation? a) Shaft is considered concentric with the bearing b) Bearing is subjected to light load c) Is used to find coefficient of friction d) Frictional torque is given by fpr2l

Which of the following are not true for petroff’s equation?

a) Shaft is considered concentric with the bearing

b) Bearing is subjected to light load

c) Is used to find coefficient of friction

d) Frictional torque is given by fpr2l
by

1 Answer

Answer :

d) Frictional torque is given by fpr2l
by

Related questions

Petroff’s equation is used to find out (A) Load carrying capacity of the bearing (B) Frictional losses in the bearing (C) Unit bearing pressure on the bearing (D) Pressure distribution around the periphery of the journal

Description : Petroff’s equation is used to find out (A) Load carrying capacity of the bearing (B) Frictional losses in the bearing (C) Unit bearing pressure on the bearing (D) Pressure distribution around the periphery of the journal

Last Answer : (B) Frictional losses in the bearing

Consider tile following statements: [IES-1993; 2002; 2006] Radius of friction circle for a journal bearing depends upon 1. Coefficient of friction 2. Radius of the journal 3. Angular speed of rotation of the shaft Which of the statements given above are correct? (a) 1,2 and 3 (b) Only 1 and 2 (c) Only 2 and 3 (d) Only 1 and 3

Description : Consider tile following statements: [IES-1993; 2002; 2006] Radius of friction circle for a journal bearing depends upon 1. Coefficient of friction 2. Radius of the journal 3. Angular speed of rotation of the shaft Which of the ... ) 1,2 and 3 (b) Only 1 and 2 (c) Only 2 and 3 (d) Only 1 and 3

Last Answer : (b) Only 1 and 2

Increase in values of which of the following results in an increase of the coefficient of friction in a hydrodynamic bearing? [IES 2007] 1. Viscosity of the oil. 2. Clearance between shaft and bearing. 3. Shaft speed. Select the using the code given below: (a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

Description : Increase in values of which of the following results in an increase of the coefficient of friction in a hydrodynamic bearing? [IES 2007] 1. Viscosity of the oil. 2. Clearance between shaft and bearing. 3. Shaft speed. Select the ... 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

Last Answer : (b) 1 and 3 only

If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the diameter of each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. Permissible tensile stress is 80N/mm2. a) 27mm b) 25mm c) 23mm d) 21mm

Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the diameter of each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. Permissible tensile stress is 80N/mm2. a) 27mm b) 25mm c) 23mm d) 21mm

Last Answer : a) 27mm

If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the tensile force on each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. a) 51234.4N b) 45968.3N c) 41666.7N d) None of the listed

Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the tensile force on each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. a) 51234.4N b) 45968.3N c) 41666.7N d) None of the listed

Last Answer : c) 41666.7N

The ball bearing is subjected to a radial load of 4000 N. Expected life for 90% bearings is 9000 hr and the shaft is rot (a) 42.21 kN (b) 37.29 kN (c) 26.33 kN (d) 35.22 kN

Description : The ball bearing is subjected to a radial load of 4000 N. Expected life for 90% bearings is 9000 hr and the shaft is rot (a) 42.21 kN (b) 37.29 kN (c) 26.33 kN (d) 35.22 kN

Last Answer : (b) 37.29 kN

The purpose of lubrication in an antifriction bearing is (a) to reduce the friction between balls and races (b) dissipation of frictional heat prevention of corrosion (c) protection of the bearing from dirt and other foreign particles (d) all of the mentioned

Description : The purpose of lubrication in an antifriction bearing is (a) to reduce the friction between balls and races (b) dissipation of frictional heat prevention of corrosion (c) protection of the bearing from dirt and other foreign particles (d) all of the mentioned

Last Answer : (d) all of the mentioned

What is the main advantage of hydrodynamic bearing over roller bearing? (a) Easy to assemble [IES-2005] (b) Relatively low price (c) Superior load carrying capacity at higher speeds (d) Less frictional resistance

Description : What is the main advantage of hydrodynamic bearing over roller bearing? (a) Easy to assemble [IES-2005] (b) Relatively low price (c) Superior load carrying capacity at higher speeds (d) Less frictional resistance

Last Answer : (c) Superior load carrying capacity at higher speeds

In an oil-lubricated journal bearing, coefficient of friction between the journal and the bearing. [IES-1995] (a) Remains constant at all speeds. (b) is minimum at zero speed and increases monotonically with increase in speed. (c) is maximum at zero speed and decreases monotonically with increase in speed. (d) becomes minimum at an optimum speed and then increases with further increase in speed.

Description : In an oil-lubricated journal bearing, coefficient of friction between the journal and the bearing. [IES-1995] (a) Remains constant at all speeds. (b) is minimum at zero speed and increases ... speed. (d) becomes minimum at an optimum speed and then increases with further increase in speed.

Last Answer : (d) becomes minimum at an optimum speed and then increases with further increase in speed.

Satisfactory hydrodynamic film in a journal bearing is formed when (a) Journal speed is low; unit pressure on the bearing is high and viscosity of lubricant used is low [IES-2006] (b) Journal speed is low; unit pressure on the bearing is low and viscosity of lubricant used is low (c) Journal speed is high; unit pressure on the bearing is high and viscosity of lubricant used is high (d) Appropriate combination of journal speed, unit pressure on bearing and lubricant viscosity exists resulting in low coefficient of friction

Description : Satisfactory hydrodynamic film in a journal bearing is formed when (a) Journal speed is low; unit pressure on the bearing is high and viscosity of lubricant used is low [IES-2006] ... journal speed, unit pressure on bearing and lubricant viscosity exists resulting in low coefficient of friction

Last Answer : (c) Journal speed is high; unit pressure on the bearing is high and viscosity of lubricant used is high

Which of the bearings given below SHOULD NOT be subjected to a thrust load? (a) Deep groove ball bearing (b) Angular contact ball bearing (c) Cylindrical (straight) roller bearing (d) Single row tapered roller bearing

Description : Which of the bearings given below SHOULD NOT be subjected to a thrust load? (a) Deep groove ball bearing (b) Angular contact ball bearing (c) Cylindrical (straight) roller bearing (d) Single row tapered roller bearing

Last Answer : (c) Cylindrical (straight) roller bearing

A radial bearing supports the load that acts along the axis of the shaft. a) True b) False

Description : A radial bearing supports the load that acts along the axis of the shaft. a) True b) False

Last Answer : b) False

Match List-I (Type of Anti-friction bearing) with List-II (Specific Use) and select the using the code given below the Lists: [IES-2006] List-I List -II A. Self-aligning ball bearing 1. For pure axial load B. Taper roller bearing 2. For hinged condition C. Deep groove ball bearing 3. For pure radial load D. Thrust ball bearing 4. For axial and radial load A B C D A B C D (a) 2 1 3 4 (b) 3 4 2 1 (c) 2 4 3 1 (d) 3 1 2 4

Description : Match List-I (Type of Anti-friction bearing) with List-II (Specific Use) and select the using the code given below the Lists: [IES-2006] List-I List -II A. Self-aligning ball bearing 1. For pure axial load B. Taper roller bearing 2. For ... C D (a) 2 1 3 4 (b) 3 4 2 1 (c) 2 4 3 1 (d) 3 1 2 4

Last Answer : (c) 2 4 3 1

Consider the following statements: [IES 2007] For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is- 1. Proportional to the area of contact 2. Proportional to the viscosity of lubricant 3. Proportional to the speed of rotation 4. Independent of the pressure Which of the statements given above are correct? (a) 1, 2, 3 and 4 (b) 1 and 4 only (c) 2, 3 and 4 only (d) 2 and 3 only

Description : Consider the following statements: [IES 2007] For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is- 1. Proportional to the area of contact 2. Proportional to the viscosity of lubricant 3. ... 4 (b) 1 and 4 only (c) 2, 3 and 4 only (d) 2 and 3 only

Last Answer : (a) 1, 2, 3 and 4

In hydrodynamic bearing, (A) The axis of journal is eccentric with respect to axis of bearing (B) The axis of journal is concentric with respect to axis of bearing (C) The axis can be either eccentric or concentric depending upon speed (D) None of the above

Description : In hydrodynamic bearing, (A) The axis of journal is eccentric with respect to axis of bearing (B) The axis of journal is concentric with respect to axis of bearing (C) The axis can be either eccentric or concentric depending upon speed (D) None of the above

Last Answer : (A) The axis of journal is eccentric with respect to axis of bearing

In hydrostatic bearing, (A) The axis of journal is eccentric with respect to axis of bearing (B) The axis of journal is concentric with respect to axis of bearing (C) The axis can be either eccentric or concentric depending upon speed (D) None of the above

Description : In hydrostatic bearing, (A) The axis of journal is eccentric with respect to axis of bearing (B) The axis of journal is concentric with respect to axis of bearing (C) The axis can be either eccentric or concentric depending upon speed (D) None of the above

Last Answer : (B) The axis of journal is concentric with respect to axis of bearing

The static load is defined as the load acting on the bearing when the shaft is _____. (a) stationary (b) rotating at rpm<5 (c) rotating at rpm<10 (d) rotating at rpm<15

Description : The static load is defined as the load acting on the bearing when the shaft is _____. (a) stationary (b) rotating at rpm

Last Answer : (a) stationary

Static load is defined as the load acting on the bearing when shaft is _____ a) Stationary b) Rotating at rpm<10 c) Rotating at rpm<5 d) None of the listed

Description : Static load is defined as the load acting on the bearing when shaft is _____ a) Stationary b) Rotating at rpm

Last Answer : a) Stationary

A_______ bearing supports the load acting along the axis of the shaft. a) Thrust b) Radial c) Longitudinal d) Transversal

Description : A_______ bearing supports the load acting along the axis of the shaft. a) Thrust b) Radial c) Longitudinal d) Transversal

Last Answer : a) Thrust

The type of spring used to achieve greater load carrying capacity within given space is (A) Spiral spring (B) Springs in series (C) Multi-leaf spring (D) Concentric springs

Description : The type of spring used to achieve greater load carrying capacity within given space is (A) Spiral spring (B) Springs in series (C) Multi-leaf spring (D) Concentric springs

Last Answer : (D) Concentric springs

Concentric springs are used, (A) To achieve greater load carrying capacity with given space (B) To achieve fail-safe system (C) To eliminate surge (D) Any of the above objectives

Description : Concentric springs are used, (A) To achieve greater load carrying capacity with given space (B) To achieve fail-safe system (C) To eliminate surge (D) Any of the above objectives

Last Answer : (D) Any of the above objectives

Stribeck equation gives the dynamic load capacity of the bearing. (a) True (b) False

Description : Stribeck equation gives the dynamic load capacity of the bearing. (a) True (b) False

Last Answer : (b) False

Stribeck equation gives the dynamic load capacity of the bearing. (a) True (b) False

Description : Stribeck equation gives the dynamic load capacity of the bearing. (a) True (b) False

Last Answer : (b) False

Stribeck equation gives dynamic load capacity of the bearing. a) True b) False

Description : Stribeck equation gives dynamic load capacity of the bearing. a) True b) False

Last Answer : b) False

If a circular shaft is welded to the plate by means of circumferential fillet, then the shaft is subjected to torsional moment M. If throat of weld is t, then torsional shear stress is given by a) M/2πtr2 b) M/πtr2 c) M/4πtr2 d) None of the listed

Description : If a circular shaft is welded to the plate by means of circumferential fillet, then the shaft is subjected to torsional moment M. If throat of weld is t, then torsional shear stress is given by a) M/2πtr2 b) M/πtr2 c) M/4πtr2 d) None of the listed

Last Answer : a) M/2πtr2

When the shaft is subjected to pure torsional moment, the torsional stress is given by? a) None of the listed b) 32M/πdɜ c) 16M/πdɜ d) 8M/πdɜ

Description : When the shaft is subjected to pure torsional moment, the torsional stress is given by? a) None of the listed b) 32M/πdɜ c) 16M/πdɜ d) 8M/πdɜ

Last Answer : c) 16M/πdɜ

When the shaft is subjected to pure bending moment, the bending stress is given by? a) None of the listed b) 32M/πdɜ c) 16M/πdɜ d) 8M/πdɜ

Description : When the shaft is subjected to pure bending moment, the bending stress is given by? a) None of the listed b) 32M/πdɜ c) 16M/πdɜ d) 8M/πdɜ

Last Answer : b) 32M/πdɜ

When the shaft is subjected to pure torsional moment, the torsional stress is given by? a) None of the listed b) 32M/πdɜ c) 16M/πdɜ d) 8M/πdɜ

Description : When the shaft is subjected to pure torsional moment, the torsional stress is given by? a) None of the listed b) 32M/πdɜ c) 16M/πdɜ d) 8M/πdɜ

Last Answer : c) 16M/πdɜ

When the shaft is subjected to pure bending moment, the bending stress is given by? a) None of the listed b) 32M/πdɜ c) 16M/πdɜ d) 8M/πdɜ

Description : When the shaft is subjected to pure bending moment, the bending stress is given by? a) None of the listed b) 32M/πdɜ c) 16M/πdɜ d) 8M/πdɜ

Last Answer : b) 32M/πdɜ

A transmission shaft is subjected to bending moment (Mb) and torsional moment (Mt). The equivalent bending moment is given by, (A) √(Mb + Mt) (B) √(Mb2 + Mt2) (C) Mb + Mt (D) Mb +√(Mb2 + Mt2)

Description : A transmission shaft is subjected to bending moment (Mb) and torsional moment (Mt). The equivalent bending moment is given by, (A) √(Mb + Mt) (B) √(Mb2 + Mt2) (C) Mb + Mt (D) Mb +√(Mb2 + Mt2)

Last Answer : (D) Mb +√(Mb2 + Mt2)

A transmission shaft is subjected to bending moment (Mb) and torsional moment (Mt). The equivalent torsional moment is given by, (A) √(Mb + Mt) (B) √(Mb2 + Mt2) (C) Mb + Mt (D) Mb +√(Mb2 + Mt2)

Description : A transmission shaft is subjected to bending moment (Mb) and torsional moment (Mt). The equivalent torsional moment is given by, (A) √(Mb + Mt) (B) √(Mb2 + Mt2) (C) Mb + Mt (D) Mb +√(Mb2 + Mt2)

Last Answer : (B) √(Mb2 + Mt2)

Entire torque is transmitted by friction in the clamp coupling. a) True b) False

Description : Entire torque is transmitted by friction in the clamp coupling. a) True b) False

Last Answer : b) False

Saddle key is transmit power or torque through friction resistant only A. True B. False

Description : Saddle key is transmit power or torque through friction resistant only A. True B. False

Last Answer : A. True

Entire torque is transmitted by friction in the clamp coupling. a) True b) False

Description : Entire torque is transmitted by friction in the clamp coupling. a) True b) False

Last Answer : b) False

Assertion (A): Oil as a cutting fluid result in a lower coefficient of friction. Reason (R): Oil forms a thin liquid film between the tool face and chip, and it provides 'hydrodynamic lubrication'. [IES- 2000] (a) Both A and R are individually true and R is the correct explanation of A (b) Both A and R are individually true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true

Description : Assertion (A): Oil as a cutting fluid result in a lower coefficient of friction. Reason (R): Oil forms a thin liquid film between the tool face and chip, and it provides 'hydrodynamic lubrication'. [IES- 2000] (a ... explanation of A (c) A is true but R is false (d) A is false but R is true

Last Answer : (c) A is true but R is false

Equivalent bending moment in a shaft subjected to axial load P, torque T and bending moment M is (a) Meq = 0.5 [M + (M2 + T2)0.5]0.5 (b) Meq = 0.5 [M + (M2 + T2)0.5] (c) Meq = ( M2 + T2)0.5 (d) None

Description : Equivalent bending moment in a shaft subjected to axial load P, torque T and bending moment M is (a) Meq = 0.5 [M + (M2 + T2)0.5]0.5 (b) Meq = 0.5 [M + (M2 + T2)0.5] (c) Meq = ( M2 + T2)0.5 (d) None

Last Answer : (b) Meq = 0.5 [M + (M2 + T2)0.5]

Equivalent torque in a shaft subjected to axial load P, torque T and bending moment M is (a) Teq = (Pa2 + M2 + T2) (b) Teq = (Pa2 + M2 + T2)0.5 (c)Teq = ( M2 + T2)0.5 (d) None

Description : Equivalent torque in a shaft subjected to axial load P, torque T and bending moment M is (a) Teq = (Pa2 + M2 + T2) (b) Teq = (Pa2 + M2 + T2)0.5 (c)Teq = ( M2 + T2)0.5 (d) None

Last Answer : c)Teq = ( M2 + T2)0.5

Partial bearing is preferred over journal bearing. a) True b) No c) More friction losses d) Can’t be determined

Description : Partial bearing is preferred over journal bearing. a) True b) No c) More friction losses d) Can’t be determined

Last Answer : a) True

When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring (B) Wire diameter of each spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring

Description : When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring ... spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring

Last Answer : (D) Square of wire diameter of each spring

When the helical torsion spring is subjected to torque, the type of stress induced in the spring wire is, (A) Tensile stress (B) Compressive stress (C) Bending stress (D) Torsional shear stress

Description : When the helical torsion spring is subjected to torque, the type of stress induced in the spring wire is, (A) Tensile stress (B) Compressive stress (C) Bending stress (D) Torsional shear stress

Last Answer : (C) Bending stress

A shaft is subjected to the...... A. Normal stress B. Bending stress C. Shear stress D. Combine stress E. All types

Description : A shaft is subjected to the...... A. Normal stress B. Bending stress C. Shear stress D. Combine stress E. All types

Last Answer : E. All types

A transmission shaft subjected to pure bending moment should be designed on the basis of (A) Maximum principal stress theory (B) Maximum shear stress theory (C) Distortion energy theory (D) Goodman or Soderberg diagrams

Description : A transmission shaft subjected to pure bending moment should be designed on the basis of (A) Maximum principal stress theory (B) Maximum shear stress theory (C) Distortion energy theory (D) Goodman or Soderberg diagrams

Last Answer : (A) Maximum principal stress theory

A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and height of the key being 14mm and 80mm respectively. Find the compressive stress induced in the key. a) 70.1 N/mm2 b) 51.6N/mm2 c) 45.5N/mm2 d) None of the listed

Description : A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and height of the key being 14mm and 80mm respectively. Find the compressive stress induced in the key. a) 70.1 N/mm2 b) 51.6N/mm2 c) 45.5N/mm2 d) None of the listed

Last Answer : b) 51.6N/mm2

A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and breadth of the key being 14mm and 80mm respectively. Find the shear stress induced in the key. a) 30.2N/mm2 b) 25.8N/mm2 c) 34.4N/mm2 d) None of the listed

Description : A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and breadth of the key being 14mm and 80mm respectively. Find the shear stress induced in the key. a) 30.2N/mm2 b) 25.8N/mm2 c) 34.4N/mm2 d) None of the listed

Last Answer : b) 25.8N/mm2

Two shafts A and B are made of same material. The diameter of shaft A is twice that of B. The torque transmitted by shaft A will be (A) Twice that of B (B) Four times that of B (C) Eight times that of B (D) Sixteen times that of B

Description : Two shafts A and B are made of same material. The diameter of shaft A is twice that of B. The torque transmitted by shaft A will be (A) Twice that of B (B) Four times that of B (C) Eight times that of B (D) Sixteen times that of B

Last Answer : (C) Eight times that of B

Splines are used if, (A) The power to be transmitted is high (B) The torque to be transmitted is high (C) The speed is high (D) There is relative motion between shaft and hub

Description : Splines are used if, (A) The power to be transmitted is high (B) The torque to be transmitted is high (C) The speed is high (D) There is relative motion between shaft and hub

Last Answer : (D) There is relative motion between shaft and hub

Two shafts A and B are made of same material. The diameters of shaft A and B are dA and dB respectively. The ratio of torque transmitted by shaft A to that of shaft B will be (A) dA/dB- (B) (dA/dB-)2 (C) (dA/dB-)3 (D) (dA/dB-)4

Description : Two shafts A and B are made of same material. The diameters of shaft A and B are dA and dB respectively. The ratio of torque transmitted by shaft A to that of shaft B will be (A) dA/dB- (B) (dA/dB-)2 (C) (dA/dB-)3 (D) (dA/dB-)4

Last Answer : (C) (dA/dB-)3

A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and breadth of the key being 14mm and 80mm respectively. Find the shear stress induced in the key. a) 30.2N/mm2 b) 25.8N/mm2 c) 34.4N/mm2 d) None of the listed

Description : A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and breadth of the key being 14mm and 80mm respectively. Find the shear stress induced in the key. a) 30.2N/mm2 b) 25.8N/mm2 c) 34.4N/mm2 d) None of the listed

Last Answer : b) 25.8N/mm2