All India Barc Online Test In Mechanical Engg.
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- 1.Which one of the following materials is used as the bonding material for grinding wheels
- A.
Silicon carbide
- B.
Sodium silicate
- C.
Boron carbide
- D.
Aluminium oxide
- 2.In reaming process
- A.
The metal removal rate is high
- B.
High surface finish is obtained
- C.
High form of accuracy is obtained
- D.
High degree of tolerance achieved
- 3.In the griding wheel have specification A60G7B23, B stands for the
- A.
Resinoid bond
- B.
Rubber bond
- C.
Shellac bond
- D.
Silicate bond
- 4.Wheel loading in grinding is defined as
- A.
Types of wheel bond fracture
- B.
Types of wheel grain fracture
- C.
Sticking of small particle on grinding wheel
- D.
None of the above
- 5.Helix angle of a fast helix drill is normally
- A.
35
- B.
60
- C.
90
- D.
5
- 6.A milling cutter having 8 teeth is rotating at 150 rpm. if the feed per tooth is 0.1 mm, the value of thew table speed in mm/min is
- A.
120
- B.
187
- C.
125
- D.
70
- 7.Gas having index of expansion is 2 flows through convergent nozzle the Critical pressure ratio is
- A.
0.66 bar
- B.
0.44 bar
- C.
0.1975 bar
- D.
0.81 bar
- 8.Among the conventional, machining process maximium specifiec energy is consumed in
- A.
Grinding
- B.
Drilling
- C.
Planing
- D.
Turnig
- 9.The enthalpy of steam at the inlet and outlet of a steam turbine is 2850 KJ/Kg and 1950 KJ/Kg respectively. The specifiec steam consumption in Kg/KW hour is
- A.
4
- B.
3
- C.
5
- D.
2
- 10.The Rateau Turbine belongs to the category of
- A.
Pressure compounded turbine
- B.
Reaction turbine
- C.
Velocity compounded turbine
- D.
Radial flow turbine
- 11.For a single stage impulse turbine with rotor diameter of 2 m and a speed of 3000 rpm when the nozzle angle is 20 Degree, The Optimium velocity of steam in m/s
- A.
334
- B.
356
- C.
668
- D.
711
- 12.The bottles from thermo plastic materials are made by
- A.
Compression moulding
- B.
Extrusion with mandrel
- C.
Injection moulding
- D.
blow moulding
- 13.The process of producing components in moulds without the application of pressure, is known as
- A.
Moulding
- B.
Laminating
- C.
Casting
- D.
Calendering
- 14.A Gas Turbine Cycle with heat exchange and reheating improves
- A.
Only the thermal efficiency
- B.
Only the Specific power output
- C.
Both thermal effiecincy and specific power output
- D.
Any one of the above
- 15.In powder metallurgy, the operation carried out to improve the bearing property of a bush is called
- A.
Infilteration
- B.
Impregnation
- C.
Plating
- D.
Sintering
- 16.Constant Pressure lines in the superheated region of the Mollier Diagram will have
- A.
A positive slope
- B.
A negative slope
- C.
Zero slope
- D.
Asymptote
- 17.Cold shortness is defined as the
- A.
Fracture in room temperature below their recrystallization temperature
- B.
Brittelness in room temperature below their recrystallization temperature
- C.
Loss of ductility above recrystallization temperature
- D.
Decrease of brittleness in room temperature
- 18.The compositions of some of the alloy steels are as under. Which of the following is Correct Designation
- A.
18 W 4 Cr 1 V
- B.
12 Mo 1 W 4 Cr 1 V
- C.
6 Mo 6 W 4 Cr 1 V
- D.
18 W 8 Cr 1 V
- 19.A Heat reservior at 1000 K is brought into contact with another Reservior at 400 K for 2 Second. During this Period 9000 KJ of heat is lost by the heat reservior. The Change in Entropy (KJ/K) due to temperature difference
- A.
20
- B.
40
- C.
30
- D.
60
- 20.A Carnot cycle is having of 0.75. if the temperature of the high temperature reservior is 1000 K. What is the temperature of low temperature reservior
- A.
250 K
- B.
300 K
- C.
350 K
- D.
400 K
- 21.A Grinding wheel of 150mm diameter is rotating at 3000 rpm. The grinding speed is
- A.
7.5 π m/s
- B.
15π m/s
- C.
45π m/s
- D.
450π m/s
- 22.In Certain type of Heat Exchanger , Both the fluids have identical mass flow rate Specific heat product. The hot fluid enters at 349 K and leaves at 322 K and the cold fluid entering at 301 K leave at 328 K. The effectiveness of HE IS
- A.
0.7
- B.
0.6
- C.
0.2
- D.
0.3
- 23.A Lead Screw with half nuts in a lathe, Free to Rotate in both Direction has
- A.
V-threads
- B.
Whithworth threads
- C.
Buttress threads
- D.
ACME threads
- 24.A Car moving with uniform acceleration covers 700 m in the next 5 second. The acceleration of the car in m/s^2.
- A.
20
- B.
10
- C.
30
- D.
40
- 25.In Highly rarefied gases, the concept loses validity is associated with
- A.
Continum Theory
- B.
Thermodynamic Equilibrium
- C.
Stability
- D.
Macroscopic Approach
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