a. Rayleigh number b. Peclet number c. Grashoff number d. Prandtl number
2. For the same maximum pressure and heat input, the most efficient cycle is
a) Otto cycle
b) Diesel cycle
c) Brayton cycle
d) Dual combustion cycle
3. Which one of the following is correct? The specific volume of water when heated from 00C
a. first increases and then decreases b. first decreases and then increases
c. increases steadily d. decreases steadily
4. Which one of the following is correct? At critical point the enthalpy of vaporization is
a. dependent on temperature only b. maximum
c. minimum d. zero
5. Two walls of same thickness and cross sectional area, have thermal conductivities in the ratio 1:2. If same temperature difference is maintained across the two faces of both the walls, what is the ratio of heat flow Q1/Q2
a. ½ b. 1 c. 2 d. 4
6. Which one of the following is correct? The effectiveness of a fin will be maximum in an environment with
a. free convection. b. forced convection c. radiation d. convection and radiation
7. During sensible cooling of moist air, its relative humidity
a. increases b. does not change c. decreases d. affects specific humidity
8. Natural convection heat transfer coefficients over surface of a vertical pipe and vertical flat plate for same height and fluid are equal. What is/are the possible reasons for this?
1. Some height 2. Both vertical 3. Same fluid 4. Same fluid flow pattern
Select the correct answer using the code given below
a. 1 only b. 1 and 2 c. 3 and 4 d. 4 only
9. A sphere, a cube and a thin circular plate, all made of same material and having same mass are initially heated to a temperature of 2500 C and then left in air at room temperature for cooling. Then, which one of the following is correct?
a. All will be cooled at the same rate b. Circular plate will be cooled at lowest rate
c. Sphere will be cooled faster d. Cube will be cooled faster than sphere but slower than circular plate
10. Answer using the code given below lists
List I (Law) List II (Effect)
A. Fourier’s Law 1. Mass transfer
B. Stefan Boltzmann Law 2. Conduction
C. Newton’s Law of Cooling 3. Convection
D. Ficks Law 4. Radiation
Code:
A B C D
a. 3 1 2 4
b. 2 4 3 1
c. 3 4 2 1
d. 2 1 3 4
11.What is the loss of available energy associated with the transfer of 1000 kJ of heat from a constant temperature system at 600 K to another at 400 K when the environmental temperature is 300 K?
a. 150 kJ b. 250 kJ c. 166.67 kJ d. 180 kJ
12Which of the following statements is correct?
a. The increase in entropy is obtained from a given quantity of heat transfer at a low temperature.
b. The change in entropy may be regarded as a measure of the rate, of the availability of heat for transformation into work.
c. The entropy represents the maximum amount of work obtainable per degree drop in temperature
d. All of the above
13. A Carnot engine operates between 327° C and 27°C. If the engine produces 300 kJ of work, entropy change during heat what is the addition?
a. 0.5 kJ/K b. 1.0 kJ/K c. 1.5 kJ/K d. 2.0 kJ/K
14. An ideal gas at 27° C is heated at constant pressure till its volume becomes three times. What would be then the temperature of gas?
a. 81° C b. 627° C c. 543° C d. 327° C
15-17. Directions : Each of the following four (4) items consists of two statements, one labeled as the ‘Assertion (A)’ and the other as ‘Reason (RY Yu are to examine these two statements carefully and select the answers to these items using the codes given below:
Codes: (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
15. Assertion (A): In the boundary layer concept, the shear stress at the outer edge of the layer is considered to be zero.
Reason(R): Local velocity is almost equal to velocity in potential flow.
16. Assertion (A): A normal shock wave can occur at any section in a convergent-divergent nozzle.
Reason (R): A normal shock wave occurs only when the flow of the fluid is supersonic and the subsequent flow after the shock is subsonic.
17. Assertion (A): Non-metals are having higher thermal conductivity than metals.
Reason (R): Free electrons in the metals are higher than those of non metals.
18. Match List I with List II and select the correct answer using the code given below the lists:
List –I (Devices) List II (Process undergone by air)
A. Cooling tower 1. Heating
B. Air coolers 2. Cooling and dehumidification
C. Evaporator coil 3. Cooling and humidification
D. Air cooled condenser 4. Heating and humidification
Code:
A B C D
a. 2 1 4 3
b. 4 3 2 1
c. 2 3 4 1
d. 4 1 2 3
19. Which one of the following is correct? Fins are used to increase the heat transfer from a surface by
a. increasing the temperature difference b. increasing the effective surface area
c. increasing the convective heat transfer coefficient d. none of the above
20. A composite wall of a furnace has 2 layers of equal thickness having thermal conductivities in the ratio of 3:2. What is the ratio of the temperature drop across the two layers?
a. 2 : 3 b. 3 : 2 c. 1: 2 d. loge2: loge 3
21. In which one of the following materials, is the heat energy propagation minimum due to conduction heat transfer?
a. Lead b. Copper c. Water d. Air
22. What is the critical radius of insulation for a sphere equal to?
k thermal conductivity in W/m K h heat transfer coefficient in W/m K
a. 2kh b. 2k/h c. k/h d. 2kh
23. Which of the following casting processes do not require central core for producing pipe?
1. Sand casting process 2. Die casting process 3. Centrifugal casting process
Select the correct answer using the code given below:
a. 1 and 2 b. 2 only c. 2 and 3 d. 3 only
24. Consider the following statements:
1. Metal forming decreases harmful effects of impurities and improves mechanical strength.
2. Metal working process is a plastic deformation process.
3. Very intricate shapes can be produced by forging process as compared to casting process.
Which of the statements given above are correct?
a. 1, 2 and 3 b. 1 and 2 only c. 2 and 3 only d. 1 and 3 only
25. Disposable containers, large shipping drums, large storage tanks are manufactured by
a. Extrusion Molding b. Injection Molding c. Transfer Molding d. Blow Molding
26. For minimizing knocking tendency is SI engine, where should the spark plug be located?
a. Near inlet valve b. Away from both the valves
c. Near exhaust valve d. Midway between inlet and exhaust
27. Ultrasonic Inspection is less suitable for a material with a
a. high damping capacity b. high electrical conductivity
c. high thermal conductivity d. None of the above
28. Rate of production in Injection Molding(IM), Transfer Molding(TM), Compression Molding(CM)
a. IM>TM>CM b. IM
29. Sheet metal operation vary form cutting to forming depending on
a. clearance given b. load applied
c. Both (a) and (b) d. None of the above
30. Full form of DTSSI
a. Digital Twin Spark-Swirl injection b. Digital Twin Spark-Swirl induction
c. Digital Twin Spark-Simultaneous induction d. Digital Twin Spark-Simultaneous injection
31. A Gantt Chart provides information about
a) Sales b) Inventory c) Production Schedule d) Machine Utilization
32. In India the work for Standardization of production has been mainly done by
a)IPC b)ISI c)SI d)none of these
33. In long run
a) fixed costs will be greater than variable costs b) variable cost will be greater than fixed costs
c) all costs are variable cost d) all costs are fixed costs.
34. A survey showed that the length of 10 samples of a part were as follows : 8,3,4,6,4,4,3,9,9. The mode is
a) 5 b) 9 c) 3 d) none of these
35. The area under the curve between +/- sigma is approximately what percent of the total
a) 64.2 b) 68.3 c) 69.3 d) 70.3
36. Standardized normal distribution curve is a good approximation to
a) exponential distribution b) chi-square distribution
c) Poisson distribution if sample is small d) binomial distribution for large sample size
37. Which of the following chart is not used in work study
a) Man Machine Chart b) Flow Process Chart c) Operation process chart d) Gantt chart
38. Which of the following is incorrect with reference to work study ?
a) Normal time = Standard Time b) Normal Time < Standard Time
c) Normal Time> Standard Time d) None of these
39. MOST is
a) Maynard Operation Sequence Technique b) Maynard Operation Scheduling Technique
c) Maynard Optimum Sequence Technique d) Maynard Optimum Scheduling Technique
40. MRPII is
a) Manufacturing Resource Planning b) Material Requirement Planning
c) Both a&b d) none of these
41. Which of the following is not a part of MRP System?
a) Customer Order Entry Module b) Bill of Material Processor
c) Capacity Requirement Planning Module d) Demand Forecast Module
42. ABC Analysis is used in
a) CPM b) PERT c) Inventory Control d) All a, b &c
43. Ship Industry uses
a) Process Layout b)Product Layout c)Mixed Layout d)Fixed Layout
44. Profit margin is given by
a) 1 – Variable cost/Sales b) 1 – Fixed cost/Sales
c) 1 – (Variable Cost + Fixed Cost)/Sales d) None of the above
45. Which of the following does not come under Direct Expenses?
a) Cost of patterns and dies b) Cost of experimental work for particular product
c) Hire of single purpose tool for particular product d) Selling and Distribution cost
46. The three way catalytic converter cannot control which one of the following?
a. HC emission b. co emission c. NOx emission d. PM emission
47. Axial relationship a≠b≠c and inter-axial relation α=β=γ=90 is true for which crystal system?
a. Orthorhombic b. monoclinic c. triclinic d. rhombohedral
48. The ultimate strength of steel in tension in comparison to shear is in the ratio of
a.1:1 b.2:1 c.3:2 d.2:3
49. Which of the following is the lower pair
a. belt drive b.cam and follower c. ball and socket d. roller bearing
50. The function of a washer is to
a. provide cushioning effect b. provide bearing area
c. absorb shocks and vibrations d. act as locking device
Answers:
1.d 2.a 3.b 4.d 5.a 6.a 7.a 8.c 9.d 10.b 11.b 12.a 13.b 14.b 15.a 16.d 17.d 18.b 19.b 20.a 21.d 22.b 23.d 24.a 25.d 26.b 27.a 28.a 29.a 30.b 31.c 32.b 33.c 34.d 35.c 36.d 37.d 38.c 39.a 40.a 41.c 42.c 43.d 44.a 45.d 46.d 47.a 48.c 49.c 50.b
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