Which
of the following materials is most elastic?
The
young’s modulus of a wire is defined as the stress which will increase the
length of wire compared to its original length
The
ultimate tensile stress of mild steel compared to ultimate compressive stress
is
The
materials having same elastic properties in all directions are called
Resilience
of a bolt may be increased by
Thermal
conductivity of non-metallic amorphous solids with decrease in temperature
If
carbon present in cast iron is partly free and partly in combined state, it is
called ________ .
Chilled cast iron is _______.
Grey
cast iron has ________.
The
Charpy test is conducted to measure________.
Which
of the following is not thermoplastic material?
Which
of the following is not a thermoset material?
Erichsen test is concerned with ________.
A
hot short metal is ________ .
Hardness
of steel depends upon amount of ________.
Steel with carbon below 0.8 % is called ________.
Steel
containing pearlite and of ferrite is ________ .
The
ultimate strength of steel in tension in comparison to shear is in the ratio
of:
Steel
containing 18 % chromium and 8 % nickel is called ________.
Steel
containing 11 % to 14 % chromium and 0.35 % carbon is called
Essential gradient of any hardness steel is ______.
The
property of a material by virtue of which a body returns to its original shape
after removal of the load is called ________ .
For steel, the ultimate strength in shear as compared to ultimate strength in tension is ________ .
The
material commonly used for air craft gas turbine is _______.
The atomic packing factor is the highest in which of the following cubic
lattice system?
In
steel, main alloy causing corrosion resistance is _______.
Steel which destroys by burning is called _______.
Alloy
steel as compared to carbon steel is more ________.
A. tough
B. strong
C. fatigue resistance
An
alloy steel contains ________ .
________is
added to raise the yield point of low carbon steel
Hardness of steel depends on _______.
Carbon
steel is ________.
Percentage of carbon in steel is _______.
Alloy
steel containing 36 % nickel is called ________.
Steel
whose elements are used for the purpose of modifying the mechanical properties
of plain carbon steel is called _______.
Which
of the following is the not a natural abrasive?
The
ability of a tool material to resist shock or impact forces is known as:
Proof
resilience in a member is stored strain energy
Resilience
of a material is considered when it is subjected to :
The
strain energy stored in a body due to external loading, within the elastic
limit, is known as
Air is
compressed isentropically in a compressor from 1 bar to 5 bar. Assuming
एक कंप्रेसर में हवा को 1 बार से 5 बार तक आइसेंट्रोपिक रूप से संपीड़ित किया जाता है। यह मानते हुए कि हवा और क्लीयरेंस वॉल्यूम स्वेप्ट वॉल्यूम का 5% है, कंप्रेसर की वॉल्यूमेट्रिक दक्षता ________ है। (50.714 = 3.157 लीजिए)
The ratio of clearance volume to the displacement volume of an R12 reciprocating compressor is 0.06. Specific volume at inlet and outlet compressor are 0.03 and 0.01 m3/kg respectively. Volumetric efficiency of the compressor is 95%
R12 प्रत्यागामी कंप्रेसर की अवकाश और विस्थापन आयतन का अनुपात 0.06 है। इनलेट और आउटलेट कंप्रेसर पर विशिष्ट आयतन क्रमशः 0.03 और 0 . 0 1 है। कंप्रेसर की वॉल्यूमेट्रिक दक्षता 95% है
In actual
compressors, there is a clearance between the cylinder head and piston to take
care of thermal expansion. Identify the correct expression from the given
options, where C is the clearance (in mm)and L is the stoke length (in mm).
वास्तविक कम्प्रेसर में, थर्मल विस्तार का ध्यान रखने के लिए सिलेंडर हेड और पिस्टन के बीच एक खाली जगह होती है। दिए गए विकल्पों में से सही अभिव्यक्ति की पहचान करें, जहां C क्लीयरेंस (मिमी में) है और L स्टोक की लंबाई (मिमी में) है।
The
isentropic expansion of initially superheated steam through the nozzle may
approximately be given by the equation:
नोजल के माध्यम से प्रारंभ में अतितापित भाप का आइसेंट्रोपिक विस्तार लगभग समीकरण द्वारा दिया जा सकता है:
For maximum
discharge, ratio of the pressure at the exit and at inlet of the nozzle 
is equal to
अधिकतम डिस्चार्ज के लिए, नोजल के निकास और प्रवेश पर दबाव का अनुपात के बराबर है
For a compressible flow, Mach Number (M) is given by which of the following expression?
एक संपीड़ित प्रवाह के लिए, मैक संख्या (M) निम्नलिखित में से किस अभिव्यक्ति द्वारा दी गई है?
Where
V = velocity of fluid in compressible flow
C = speed of sound in air
For an ideal
diffuser in steady flow, if mcv
स्थिर प्रवाह में एक आदर्श विसारक के लिए, यदि mcv उसके नियंत्रण आयतन (CV) में वायु का द्रव्यमान है, तो:
The pressure
ratio known as critical pressure ratio for maximum discharge through the nozzle
is given by:
नोजल के माध्यम से अधिकतम डिस्चार्ज के लिए दबाव अनुपात जिसे क्रांतिक दबाव अनुपात के रूप में जाना जाता है, निम्न द्वारा दिया जाता है:
The critical
pressure ratio of a convergent nozzle is defined as the ratio of the :
अभिसारी नोजल के क्रांतिक दबाव अनुपात को निम्न के अनुपात के रूप में परिभाषित किया गया है:
The smallest
section of a nozzle is known as the
नोजल के सबसे छोटे भाग को कहा जाता है