गियर हॉबिंग प्रक्रिया मिलिंग से किस कारण की वजह से तेज होती है?

- a)सूचीकरण समय का कम होना
- b)होब का तेजी से घूमना
- c)कार्य-वस्तु का तेजी से घूर्णन करना
- d)कई टूथ एक समय में काटना

Correct answer is option 'D'. Can you explain this answer?

ALKA SAXENA answered • 51 minutes ago

गियर हॉबिंग एक बहु-बिंदु यांत्रिकी प्रक्रिया है, जिसमें गियर टूथ उत्तरोत्तर एक हब के साथ कटाव की श्रृंखला द्वारा उत्पन्न होते हैं। होब और कार्य-वस्तु का हिस्सा दोनों लगातार घूर्णन करते रहते हैं क्योंकि होब को गियर ब्लेंक के मुख की चौड़ाई में प्रविष्ट जाता है।

गियर मिलिंग एक बहु-बिंदु यांत्रिकी प्रक्रिया है, जिसमें अलग-अलग टूथ स्पेसिंग एक घुमावदार बहुविध एज कटर द्वारा बनाए जाते हैं जहां, घुमावदार बहुविध एज कटर का अनुभागीय क्षेत्र उत्पादित टूथ (वॉल्यूट में) के अनुभागीय क्षेत्र के समान होता है। प्रत्येक स्थान को काटने के बाद, गियर को अपनी मूल स्थिति में वापस कर दिया जाता है, और गियर ब्लेंक को अगले काट के लिए अनुक्रमित किया जाता है।

तो, हॉबिंग प्रक्रिया, मिलिंग प्रक्रिया से तेज़ होती है क्योंकि एक समय में कई टूथ काटे जाते हैं।

In an elliptical trammel, the length of the link connecting the two sliders is 100 mm. The tracing pen is placed on 150 mm extension of this link. The major and minor axes of the ellipse traced by the mechanism would be

- a)250 mm and 150 mm
- b)250 mm and 100 mm
- c)500 mm and 300 mm
- d)500 mm and 200 mm

Correct answer is option 'C'. Can you explain this answer?

SUNITA ARORA answered • 51 minutes ago

Pramod Arya asked • 10 minutes ago

In a slider crank mechanism, the maximum acceleration of slider is obtained when the crank is

- a)At the inner dead centre position
- b)At the outer dead centre position
- c)Exactly midway b/w two dead centers
- d)None of the above

Correct answer is option 'A'. Can you explain this answer?

A heat engine using lake water at 12° C as source and the surrounding atmosphere at 2°C as sink executes 1080 cycles per minute. If the amount of heat drawn per cycle is 57 J, then the output of the engine will be

- a)66 W
- b)56 W
- c)46 W
- d)36 W

Correct answer is option 'D'. Can you explain this answer?

Shanti Devi answered • 52 minutes ago

Given That

6.0 kJ of conduction heat transfer has to take place in 10 minutes from one end to other end of a metallic cylinder of 10 cm^{2} cross-sectional area, length 1 meter and thermal conductivity as 100 W/mK. What is the temperature difference between the two ends of the cylindrical bar?

- a)80°C
- b)100°C
- c)120°C
- d)160°C

Correct answer is option 'B'. Can you explain this answer?

SHWETA SHRIVASTAVA answered • 11 hours ago

Ans. (b)

or

or dt = 100

Chaudhari Subash Chandra asked • 17 minutes ago

Which one of the following statement bolds good for the equation dQ=dE +dW

- a)Any process undergone by a closed stationary system
- b)any process, reversible and irreversible and for any system
- c)a closed system when only pdV work is present
- d)Only reversible process

Correct answer is option 'B'. Can you explain this answer?

The movable wicket gates of a reaction turbine are used to

- a)control the flow of water passing through the turbine
- b)control the pressure under which the turbine is working
- c)strengthen the casing of the turbine
- d)reduce the size of the turbine

Correct answer is option 'A'. Can you explain this answer?

KALIKADEVI KUMARI answered • 11 hours ago

Guide vanes or wicket gates are arranged inside the casing to form a number of flow passages between the casing and runner blades. They direct the water onto the runner at an angle appropriate to the design.

In a multi-cylinder in-line internal combustion engine, even number of cylinders is chosen so that

- a)uniform firing order is obtained
- b)the couples are balanced
- c)primary forces are balanced
- d)secondary forces are balanced

Correct answer is option 'D'. Can you explain this answer?

Kidar Nath Sharma answered • 11 hours ago

The inertia forces reveals that for even number of cylinders (n > 2) i.e., for four, six, eight etc. cylinders the secondary forces are also completely balanced out.

Debankan Munsi asked • 20 minutes ago

Flow takes place and Reynolds Number of 1500 in two different pipes with relative roughness of 0.001 and 0.002. The friction factor

- a)Will be higher in the case of pipe with relative roughness of 0.001.
- b)Will be higher in the case of pipe having relative roughness of 0.002.
- c)Will be the same in both the pipes.
- d)In the two pipes cannot be compared on the basis of data given

Correct answer is option 'C'. Can you explain this answer?

Dhanwanti Devi answered • 11 hours ago

Ans. (c) The flow is laminar (friction factor,

) it is not depends on roughness but for turbulent flow it will be higher for higher relative roughness.

) it is not depends on roughness but for turbulent flow it will be higher for higher relative roughness.

SHAWETA KUMARI asked • 2 hours ago

The regulating wheel of a centreless grinder is rotating at a surface speed of 127 mm/s and is inclined at an angle of 5°, Calculate the feed rate of material past the grinding wheel. [sin5° = 0.087, cos5° = 0.996]

- a)5.2 mm/s
- b)8 mm/s
- c)11 mm/s
- d)14.2 mm/s

Correct answer is option 'C'. Can you explain this answer?

Shivam Saxena asked • 2 hours ago

If a spring-mass-dashpot system is subjected to excitation by a constant harmonic force, then at resonance, its amplitude of vibration will be

- a)Infinity
- b)Inversely proportional to damp in
- c)Directly proportional to damping
- d)Decreasing exponentially with time

Correct answer is option 'A'. Can you explain this answer?

AYUSH MALIK asked • 3 hours ago

An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicated

thermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air at

int ake in 1 kg/m^{3}. T he indicated mean effective pressure for the engine is

thermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air at

int ake in 1 kg/m

- a)6.075 bar
- b)6.75 bar
- c)67.5 bar
- d)243 bar

Correct answer is option 'A'. Can you explain this answer?

DUSHYNTA SHARMA asked • 3 hours ago

The dynamic load on a gear is due to:

1. Inaccuracies of tooth spacing.

2. Irregularities in tooth profile.

3. Deflection of the teeth under load.

4. Type of service (i.e., intermittent, one shift per day, continuous per day).

Which of the above statements are correct?

1. Inaccuracies of tooth spacing.

2. Irregularities in tooth profile.

3. Deflection of the teeth under load.

4. Type of service (i.e., intermittent, one shift per day, continuous per day).

Which of the above statements are correct?

- a)1, 2 and 3
- b)2, 3 and 4
- c)1, 3 and 4
- d)1, 2 and 4

Correct answer is option 'A'. Can you explain this answer?

NEHA DEVI asked • 3 hours ago

In Rankine cycle, the work output from the turbine is given by

- a)change of internal energy between inlet and outlet
- b)change of enthalpy between inlet and outlet
- c)change of entropy between inlet and outlet
- d)change of temperature between inlet and outlet

Correct answer is option 'B'. Can you explain this answer?

Kon Singha asked • 4 hours ago

An air refrigerator of 10 ton capacity operates in Bell coleman cycle between pressure limits of 1bar and 4 bar. Air at inlet of compressor is at 1 bar and 253K. Air at exit of cooler is at 313 K. After air is cooled to 290K at

constant pressure in cooler, it is allowed to expand isentropically to 1 bar in expansion cylinder. Cold air is then sent to cold chamber to extract heat (Refrigeration effect). Determine COP of refrigerator.

constant pressure in cooler, it is allowed to expand isentropically to 1 bar in expansion cylinder. Cold air is then sent to cold chamber to extract heat (Refrigeration effect). Determine COP of refrigerator.

- a)1.5
- b)2.05
- c)3.1
- d)3.6

Correct answer is option 'B'. Can you explain this answer?

SAROJ KUMARI asked • 5 hours ago

Which one of the following laws is not applicable for a simple pendulum?

- a)the time period does not depend on its magnitude
- b)the time period is proportional to its length
- c)the time period is proportional to square root of its length
- d)the time period is inversely proportional to square root of its acceleration due to gravity

Correct answer is option 'B'. Can you explain this answer?

Hemanth Morupakala asked • 5 hours ago

For the two shafts connected in parallel, find which statement is true?

- a)Torque in each shaft is the same
- b)Shear stress in each shaft is the same
- c)Angle of twist of each shaft is the same
- d)Torsional stiffness of each shaft is the same

Correct answer is option 'C'. Can you explain this answer?

Kirankesavareddy Naredla asked • 6 hours ago

Consider the following statements for a throttling process:

1. It is an adiabatic process.

2. There is no work transfer in the process.

3. Entropy increases in throttling process

Which of these statements are correct ?

- a)1, 2 and 3
- b)1 and 2 only
- c)2 and 3 only
- d)1 and 3 only

Correct answer is option 'A'. Can you explain this answer?

Achuth Kumar Yelleti asked • 6 hours ago

A beam having uniform cross-section carries a uniformly distributed load of intensity q per unit length over its entire span, and its mid-span deflection is δ.

The value of mid-span deflection of the same beam when the same load is distributed with intensity varying from 2q unit length at one end to zero at the other end is:

- a)1/3 δ
- b)1/2 δ
- c)2/3 δ
- d)δ

Correct answer is option 'D'. Can you explain this answer?

Nirmal Mallick asked • 7 hours ago

The study of thermodynamics provides answer to the following:

1. whether a process is feasible or not

2. to quantify the energy required for a process

3. rate or speed with which a process occurs

4. extent to which a reaction/process takes place

Which of the above is/are correct?

- a)1, 2 and 3
- b)1 and 2
- c)1, 2 and 4
- d)2, 3 and 4

Correct answer is option 'C'. Can you explain this answer?

BHARTI GUPTA asked • 7 hours ago

A steel wire ( E = 200 GPa) of sectional area 10 x 10^{-5} m^{2} is to be extended to twice its initial length. To accomplish this task, the two ends of the wire should be pulled by a force of

- a)20 MM
- b)5MN
- c)50 MN
- d)2MN

Correct answer is option 'A'. Can you explain this answer?

Abhisekh Joshi asked • 7 hours ago

Select the wrong statement;

- a)The coefficient of fluctuation of speed remains same with any change in the mean speed of the prime mover.
- b)The maximum fluctuation of energy of a flywheel is directly proportional to coefficient of fluctuation of speed.
- c)For the same fluctuation of energy, the size of the flywheel is reduced at higher mean speed of rotation.
- d)For the same mass of flywheel, the rim type and disc type flywheels are equally preferable

Correct answer is option 'D'. Can you explain this answer?

Abhishek Govil asked • 7 hours ago

In gating system design, which one of the following is the correct sequence in which chokearea, pouring time, pouring basin and sprue sizes are calculated ?

- a)Choke area - Pouring time - Pouring basin-Sprue
- b)Pouring basin - Sprue - Choke area - Pouring time
- c)Choke area - Sprue - Pouring basin - Pouring time
- d)Pouring basin - Pouring time - Choke area-Sprue

Correct answer is option 'A'. Can you explain this answer?

Sreenath Narayandas asked • 8 hours ago

A small maintenance project consists of the following 10 jobs, whose precedence, relationships are identified by their node numbers:

Q.

What is the earliest and latest start and finish times for job F?

- a)[7, 13] [7, 13]
- b)[7, 14] [7, 15]
- c)[7, 9] [14, 16]
- d)[9, 17] [12, 20]

Correct answer is option 'A'. Can you explain this answer?

ASHISH KAUSHAL asked • 9 hours ago

A closed-coil helical spring is subjected to a torque about its axis. The spring wire would experience a

- a)bending stress
- b)direct tensile stress of uniform intensity at its cross-section
- c)direct shear stress
- d)torsional shearing stress

Correct answer is option 'A'. Can you explain this answer?

Ashish Vishwakarma asked • 9 hours ago

For a real fluid moving with uniform velocity, the pressure

- a)depends upon depth and orientation
- b)is independent of depth but depends upon orientation
- c)is independent of orientation but depends upon depth
- d)is independent of both depth and orientation

Correct answer is option 'A'. Can you explain this answer?

MEHUL PORWAL asked • 9 hours ago

कैम के ड्वेल का कोण वह कोण के रूप में परिभाषित किया जाता है, जो..

- a)अनुगामी के दौरान इसकी प्रारंभिक स्थिति में लौट जाता है
- b)अनुगामी के निश्चित विस्थापन के लिए कैम का घूर्णन कोण है
- c)जिसके माध्यम से कैम उस अवधि के दौरान घूमता है जिसमें अनुगामी उच्चतम स्थिति में रहता है
- d)तत्काल से कैम द्वारा हटाने पर अनुगामी बढ़ने लगता है, जब तक कि यह इसके उच्चतम स्थिति तक नहीं पहुंच जाता है

Correct answer is option 'C'. Can you explain this answer?

Debasish Bisoyee asked • 9 hours ago

A straight bar is fixed at edges A and B. its elastic modulus is E and cross-section is A. There is a load P = 120 N acting at C. The reactions at the ends are

- a)60 N at A, 60 N at B
- b)30 N at A, 90 N at B
- c)40 N at A, 80 N at B
- d)80 N at A, 40 N at B

Correct answer is option 'D'. Can you explain this answer?

Shobha Kumari asked • 9 hours ago

All of the following statements are correct, except,

- a)the interval of time taken by a vibrating body to complete a cycle is called period.
- b)the natural frequency of a spring-mass system increases if it is made to operate at a very high altitude.
- c)in the normal or principal mode of vibration all the moving parts of the system oscillate in phase with the same frequency.
- d)the phenomenon of resonance manifests when the frequency of external exciting force coincides with the natural frequency of the system.

Correct answer is option 'B'. Can you explain this answer?

SINGH AMIT asked • 10 hours ago

A closed system undergoes a process 1-2 for which the values of Q_{1-2} and W_{1-2} are +20 kJ and +50 kJ respectively. If the system is returned to state 1 and Q_{2-1} is - 10 kJ what is the value of work W_{2-1}

- a)+20 kJ
- b)-40 kJ
- c)-80 kJ
- d)+40 kJ

Correct answer is option 'B'. Can you explain this answer?

Indian Army asked • 10 hours ago

Assertion (A): If a graph is plotted for absolute temperature as a function of entropy, the area under the curve would give the amount of heat supplied.

Reason (R): Entropy represents the maximum fraction of work obtainable from heat per degree drop in temperature.

- 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

Correct answer is option 'B'. Can you explain this answer?

REETA KUMARI asked • 11 hours ago

A point load placed at the mid span of a simply supported beam has been replaced by a uniformly distributed load of same total value. The central deflection in the later case will be

- a)same
- b)less
- c)more
- d)depends upon Z value of beam

Correct answer is option 'B'. Can you explain this answer?

Vipin Kumar asked • 11 hours ago

The process of making hollow castings of non circular shape and desired thickness of non circular shape and desired thickness by permanent mould without use of core is known as

- a)die casting
- b)Slush casting
- c)Pressed casting
- d)Centrifugal casting

Correct answer is option 'B'. Can you explain this answer?

REKHA KUMARI asked • 11 hours ago

A piston cylinder device with a set of stops init ially at a pressure of 1MPa and tem perat ure of 400°C

contains 0.3 kg of water vapour stops corresponds to 60% of the initial volume. Now as the water vapour is

cooled keeping the pressure constant the compression work required will be. Take 'R' for water vapour as

0.4615 kJ/kgK. Consider water vapour as an ideal gas ______________ kJ.

contains 0.3 kg of water vapour stops corresponds to 60% of the initial volume. Now as the water vapour is

cooled keeping the pressure constant the compression work required will be. Take 'R' for water vapour as

0.4615 kJ/kgK. Consider water vapour as an ideal gas ______________ kJ.

Correct answer is between '37,38'. Can you explain this answer?

SAHIL KUNDRA asked • 12 hours ago

The correct statement about ideal fluid is:

- a)An ideal fluid is incompressible, non-viscous and has infinite bulk modulus.
- b)An ideal fluid is incompressible, non-viscous and has finite bulk modulus.
- c)An ideal fluid is compressible, viscous and has infinite bulk modulus.
- d)An ideal fluid is compressible, non-viscous and has infinite bulk modulus.

Correct answer is option 'A'. Can you explain this answer?

SHANU VERMA asked • 12 hours ago

उप्लावन केंद्र के विषय में निम्नलिखित में से कौन सा कथन सत्य है?

- a)यह वह बिंदु है जहाँ उप्लावन बल कार्य करता है
- b)यह विस्थापित पानी के आयतन के केन्द्रक के सम्पाती होता है
- c)यह वह बिंदु है जहां उप्लावन बल कार्य करता है और यह विस्थापित पानी के आयतन के केन्द्रक के सम्पाती होता है
- d)यह पिंड के बाहर कार्य करता है

Correct answer is option 'C'. Can you explain this answer?

Hardik Barot asked • 12 hours ago

A cylindrical elastic body subjected to pure torsion about its axis develops

- a)tensile stress in a direction 45º to the axis
- b)no tensile or compressive stress
- c)maximum shear stress along the axis of the shaft
- d)Maximum shear stress at 45º to the axis

Correct answer is option 'A'. Can you explain this answer?

Shobha Kumari asked • 13 hours ago

Two rods of diameter 50mm each are joined by flash butt welding. At interface 1.5mm of material melt from each rod which has resistance of 38.6?. If the melting energy is 54 MJ/m^{3} and and the time required

for melting is 8 seconds. The supply voltage for the process is _____ volts

for melting is 8 seconds. The supply voltage for the process is _____ volts

(**Important** - Enter only the numerical value in the answer)

Correct answer is between '39,40'. Can you explain this answer?

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