Mechanical Engineering

∇ × ∇ × P, where P is a vector, is equal to  

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

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

Naiver Stoke's equation represents the conservation of

In Kaplan turbine runner, the number of blades is generally of the order _____.

The difference between the total head line and the hydraulic grade line represents

In highly rarefied gases, the concept of this loses validity

The equivalent length of a column of length L having one end fixed and the other end free is

Which of the following is last step of product development process?

Laminar flow takes place in the circular tube. At what distance form the boundary does the local velocity
equal to the average velocity ?

Consider the following statements: In a chemical dehumidification process,
1. DPT decreases
2. WBT decreases
3. DBT decreases

Q. Which of these are correct?

In an impulse turbine, the pressure drops

The time of oscillation of a floating body with increase in metacentric height will be

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]

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/m³. T he indicated mean effective pressure for the engine is

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?

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

Of the following, which is more practical in case of I.C. engine (Diesel) :

A screw is said to be over hauling screw, if its efficiency is

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.

The fibres which resemble wool are known as

Consider the following actions:
1. Mechanical abrasion
2. Diffusion
3. Plastic deformation
4. Oxidation
Which of the above are the causes of tool wear?

The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

When a four digit number is divided by 65, it leaves a remainder of 29. If the same number is divided by 13, the remainder would be______

If    t hen the value of  

______________

ln a two-dimensional flow, where u is the x-component and v is the y-component of velocity the equation of streamline is given by

For a vacuum pressure of 4.5 m of water, the equivalent absolute pressure is:

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

 For the velocity function,

the equation of the streamline passing through (1,1) is

विमा 20 mm x 20 mm वाली एक छड़ 10 kN के एक अक्षीय तन्यता भार का वहन कर रही है। उत्पन्न तन्यता तनाव क्या होगा?

In square threads, the depth c/and pitch pof threads are related by .

घडी के तंत्र में, कौनसी गियर श्रृंखला मिनट की सुई और घंटे की सुई को जोड़ने में प्रयुक्त होती है?

कौन सा तंत्र गणितीय रूप से सटीक सरल रैखिक गति उत्पन्न करता है?

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 steel wire ( E = 200 GPa) of sectional area 10 x 10^-5 m² 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

तापमान में वृद्धि के साथ तरल की श्यानता पर क्या प्रभाव पड़ेगा?

Select the wrong statement;

If 'u' and 'v' the component of velocity in x-direction and y-direction respectively are given u = ax+by and
v = cx + dy then the condition to be satisfy is

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 ?

In Electrolux refrigerator ________

Two equal length beams are fixed at their ends. One carries a distributed load and other carries same load but concentrated in the middle. The ratio of maximum deflections will be

चल ब्लेडों में एन्थाल्पी पात और कुल एन्थाल्पी का अनुपात क्या कहलाता है?

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?

For a cotter, the ratio of thickness to width is

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

For a real fluid moving with uniform velocity, the pressure

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

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

All of the following statements are correct, except,

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 tool used in cutting an external thread is called a:

COP of a carnot heat pump operating between –3ºC and 27ºC is

आदर्श द्रव के बारे में निम्नलिखित में से कौन सा सत्य है?

Which one of the following is correct dimension of surface tension?

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 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.

The correct statement about ideal fluid is:

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

In the figure given below, when is the absolute velocity of end B of the coupler equal to the absolute velocity of the end A of the coupler?

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

प्लेट क्लच में अक्षीय बल 4 किलो न्यूटन है। सपर्श सतह की आंतरिक त्रिज्या 50 मिमी है और बाह्य त्रिज्या 100 मिमी है। एकसमान दाब के लिए घर्षण सतह की माध्य त्रिज्या क्या होगी?

A closed system receives 60 kJ heat but its internal energy decreases by 30 kJ, Then the work done by the system is

The upper surface of a weir over which water flows is known as

विकास का LPG मॉडल _________ द्वारा पेश किया गया था।

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/m³ and and the time required
for melting is 8 seconds. The supply voltage for the process is _____ volts

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

The above figure shows the three coplaner forces P, Q and R acting at a point O. If these forces are in equilibrium, then

Which of the following is not a advantage of cellular manufacturing system?

Match the List-I (Terms) with List-II (Description) and select the correct answer: