1. The relationship between two specific heats CP and CV is

ghama

Cp-Cv=R/J

Cp-Cv=J/R

CP+Cv=J

2. The efficiency of a Carnot engine depends on

Type of fuel

Size of engine

Design of engine

Temperature of source and sink

3. Second law of thermodynamics defines

Entropy

Enthalpy

Heat

Work

4. In an isothermal process, the internal energy

increases

decreases

remains constant

first increases then decreases

5. Maximum work is done in compressing air when the compression is done in

isothermal process

adiabatic process

polytropic process

None of these

6. What will be the volume of air at 327 °C if its volume at 27 °C is 1.5 m3

3m3

1.5m3

6m3

10m3

7. Reciprocating air compressor is best suited for

large quantity of air at high pressure

small quantity of air at high pressure

small quantity of air at low pressure

large quantity of air at low pressure

8. Losses in a centrifugal compressor are due to

inlet losses

impeller channel losses

diffuser losses

All of these

9. Which of the following cycles uses air as the refrigerant

Ericsson

Stirling

Carnot

Bell-Coleman

10. One ton of refrigeration is equal to

210 kJ/min

21 kJ/min

420 kJ/min

620 kJ/min

11. The refrigerant for a refrigerator should have

high sensible heat

high total heat

high latent heat

low latent heat

12. If a heat pump cycle operates between the condenser temperature of +27 °C and evaporator temperature of 23 then the Carnot CoP will be

0.2

1.2

5

6

13. Which of the following refrigerants has lowest freezing point

Freon 12

NH3

CO2

Freon-22

14. If PV is partial pressure of water vapour in air and PS is saturation pressure of water vapour at same temperature, then relative humidity is equal to

Pv/Ps

Ps/Pv

Ps-Pv

Pv-PS

15. Indication of amount of moisture in air is given by

dry bulb temperature

wet bulb temperature

dew point temperature

saturation temperature

16. As relative humidity decreases, the dew point will be

lower than wet bulb temperature

higher than wet bulb temperature

equal to wet bulb temperature

None of these

17. Sensible heat is the heat needed to

Vaporise water into steam and vice versa

Change the temperature of a liquid or vapour

Convert water into steam and super heat it

Measure dew point temperature

18. Which of the following is the unit of entropy

J/kg °k

Nm/kg sec

J/kg

Nm/sec

19. The difference of pressure between the inside and outside of a liquid drop is

P=T×r



P=T/2r

P=2T/r

20. Newton's law of viscosity is a relationship between

shear stress and rate of angular distortion

shear stress and viscosity

pressure, velocity and viscosity

shear stress, pressure and rate of angular distortion

21. The curved lines on a psychrometric chart indicates

specific humidity

relative humidity

DBT

WBT

22. Ratio of inertia force to surface tension is known as

Mach number

Froude number

Reynold's number

Weber's number

23. Friction factor of pipes depends on

rate of flow

fluid density

viscosity

All of these

24. Pelton wheels are used for minimum of following heads

20m

150m

25 m

200 m or above

25. If is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine

<img src='./qimages/3399-25.jpg'>

26. The melting point of the filler metal in brazing should be above

420 °C

600 °C

1530 °C

800 °C

27. Moulding sands are graded according to their

permeability

clay content and grain size

strength

None of these

28. Hot tear is related to

casting defect

process of fabrication

heat treatment

welding of non-ferrous metals

29. Large and heavy castings are made by

green sand moulding

pit moulding

dry sand moulding

pressure moulding

30. In which of the following welding process consumable electrode is used

TIG

MIG

Thermit

Laser

31. Arc stability is better with

AC welding

DC welding

Both AC DC welding

None of these

32. Which of the following brazing joints is strongest

Butt

Scarf (inclined)

Lap

All are equally strong.

33. The important property of a material in all metal forming processes is

elasticity

plasticity

ductility

brittleness

34. If V is volume of metal in casting and A is its surface area, then time of solidification of metal will be proportional to 11



V,1/A2

V2,1/A2

A

35. Spinning process is carried out by

Hydraulic press

Mechanical press

Lathe

Milling machine

36. Which of the following process is used for gear finishing

Hobbing

Shaping

Milling

Shaving or burnishing

37. The ductility of a material after work hardening

increases

decreases

remains unaltered

None of these

38. Lathe bed is usually made of

structural steel

stainless steel

cast iron

mild steel

39. In blanking operation, the angle of shear is provided on

die

punch

both on punch and die

None of these

40. Tool life is most affected by

cutting speed

tool geometry

feed and depth

None of these

41. On tool surface, crater wear occurs mainly due to

abrasion

diffusion

oxidation

adhesion

42. In machining process, chips break due to

plasticity

elasticity

work hardening

None of these

43. No cutting fluid is used while machining which metal

Mild steel

Carbon steel

Aluminium

Cast iron

44. Which of the following metals can be easily drawn into wire

Tin

Copper

Zinc

Cast iron

45. The composition of silver solder is

silver, copper, zinc

silver, tin, zinc, nickel

silver, nickel

silver, copper, nickel

46. Muntz metal contains copper and zinc in the ratio of

50:50

40:60

60:40

80:20

47. In electro discharge machining the tool is made of

tungsten carbide

diamond

copper or brass

stainless steel

48. The cutting tool used in spark erosion machining process is called

arc

capacitor

electrode

dielectric

49. Anvil is made of which of the following metal

Mild steel

Cast steel

Copper

Brass

50. Which of the following are discrete products

Nut

Bolt

Screw

All of these

51. Which of the following are continuous products

Sheets (metallic)

Pipes

Wire rolls

All of these

52. Grate is the place in the boiler where

fuel is burnt

pressure of steam is measured

temperature of saturated steam is increased

None of the above

53. Boiler rating is usually defined in terms of

maximum temperature of steam

heat transfer rate kJ/hr

heating surface area

heating output in kg/hr

54. Thermal efficiency of an ideal diesel cycle

increases with increase in cut-off ratio

decreases with increase in cut-off ratio

does not depend on cut-off ratio

may increase or decrease with increase in cut-off ratio

55. Chemically correct air-fuel ratio by mass for combustion of petrol is approximately

5

10

12

15

56. In magneto ignition system, as the engine speed increases, the value of current

increases

decreases

remains the same

may increase or decrease

57. If the temperature of intake air in an I.C. engine is lowered, its efficiency will

increase

decrease

remains unchanged

will increase upto certain limit and then decrease

58. In a gas turbine cycle with regeneration

pressure ratio increases

work output decreases

thermal efficiency increases

heat input increases

59. The term 'priming' in boiler is associated with

removal of air from the boiler shell

water particles being carried by steam

firing of boiler

control of rate of fuel consumption

60. Compression ratio in I.C. engine is defined as the ratio of

total cylinder volume to swept volume

total cylinder volume to clearance volume

swept volume to clearance volume

None of the above

61. Higher octane rating for S.I. engine fuel indicates that it has

higher calorific value

higher volatility

higher ignition lag

lower ignition lag

62. Air standard efficiency of an Otto cycle having compression ratio of 5 will be

1-5r-1





None of these

63. Most important property of I.C. engine lubricant is

density

viscosity

thermal conductivity

None of these

64. The throttling operation in a domestic refrigerator is carried out in

evaporator

capillary tube

expansion valve

condenser

65. Household refrigerators operate on

reversed Carnot cycle

cascade refrigeration cycle

vapour absorption cycle

vapour compression cycle

66. When water Lithium Bromide is used in a vapour absorption refrigeration system, then

they together act as refrigerant.

water is the refrigerant.

lithium bromide is refrigerant.

None of these

67. For saturated air, the dew point temperature is

equal to WBT

less than WBT

more than WBT

None of these

68. Process of sensible heating

increases specific humidity

decreases specific humidity

decreases relative humidity

increases relative humidity

69. Psychrometer is a device which is used to measure

dry bulb temperature

wet bulb temperature

dry bulb and wet bulb temperature simultaneously

dew-point

70. In vapour absorption refrigeration, heat is rejected in

condenser only

generator only

absorber only

both condenser and absorber

71. A heat pump working on a reversed Carnot cycle has a CoP of 4. It is made to work as refrigerator with 1 kW work input. The refrigerating effect will be

1

2

3

4

72. In conventional refrigerants, which element is responsible for ozone depletion

Chlorine

Carbon

Hydrogen

Fluorine

73. Bernoulli's equation refers to conservation of

mass

energy

momentum

None of these

74. Falling drops of water become spherical in shape due to the property of

adhesion

cohesion

surface tension

viscosity

75. The pressure at a depth of 5 km below the surface of the sea water, considering sp. gravity of water to be 1.3, will be

63765 Pa

637650 Pa

1.27 × 108 Pa

1.27 × 109 Pa

76. The velocity of liquid flowing through the divergent portion of a venturimeter

increases

decreases

remains constant

cannot be predicted

77. The shear stress at a point 5 cm from the pipe axis is 20 Pa. The value of shear stress at the pipe wall, having diameter 20 cm will be

40Pa

80Pa

50 Pa

cannot be determined

78. The value of velocity ratio for Kaplan turbine is about

0.5

0.9

1.5

2.0

79. Which of the following turbine does not require draft tube

Kaplan turbine

Pelton turbine

Francis turbine

Propeller turbine

80. The vanes of centrifugal pumps are usually

curved forward

curved backward

radial

None of these

81. Notch is a device used for the measurement of

rate of flow through pipes

rate of flow through small channel

velocity through pipes

velocity through small channels

82. In centrifugal pump, the liquid enters

at the centre

at the bottom

at the top

from sides

83. Francis turbine is used when the available head of water range in

0-25m

60-250m

above 250 m

can be used for any head

84. Copper sheets are manufactured by process of

drawing

rolling

extruding

hammering

85. Dies for wire drawing are made of the following material

cast iron

wrought iron

mild steel

carbides

86. The type of welding used for car bodies is

resistance welding

gas welding

arc welding

None of these

87. Commonly used flame in gas welding is

neutral

oxidising

carburising

None of these

88. Which of the following sands is used to keep away the green sand from sticking to the pattern

Core sand

Parting sand

Loam sand

Synthetic sand

89. Sprue in casting refers to

gate

runner

riser

vertical passage

90. The main function of cutting fluid is to

wash away the chips

provide lubrication

cool the tool and workpiece

All of these

91. In which of the following operation on lathe, spindle speed is minimum

Knurling

Taper turning

Fine finishing

Thread cutting

92. The size of shaper is specified by

length of stroke

size of tool

ratio of forward to return stroke

size of table

93. Enlarging of an existing circular hole with a rotating single point tool is called

boring

drilling

reaming

internal turning

94. Which of the following material is used as binding material for grinding wheels

Silicon carbide

Sodium silicate

Boron carbide

Aluminium oxide

95. The cutting edges of a standard twist drill are called

cutting lip

flanks

flutes

wedges

96. Which of the following is the natural abrasive

Al2O3

SiC

Boron carbide

Corundum

97. For which material, the cutting speed will be minimum for machining

Aluminium

Brass

Copper

Cast iron

98. The purpose of using flux in soldering is to

increase fluidity of solder metal

prevent oxides formation

wash away the surplus solder

lowering the melting temperature of solder

99. In sand moulding, the middle part of flask is called

cope

drag

cheek

middle flask

100. Least shrinkage allowance is provided for the following

brass

aluminium

cast iron

lead

101. A knee is part of the following

Shaper

Lathe

Milling machine

Slotter

102. Seasoning of timber refers to

removing of moisture

adding moisture

cutting in desired shape

removing curves

103. Which is the hardest wood

Teak

Tun

Shisham

Babul

104. Poise is the unit of

mass density

kinematic viscosity

dynamic viscosity

velocity gradient

105. Continuity equation can take the form

<img src='./qimages/3399-105.jpg'>

106. Two stroke engines have

valves

ports

both

None of these

107. Compression ratio of diesel engine is in the range of

8to10

10to15

16 to 20

None of these

108. Steam turbines are governed by the following methods

Throttle governing

Nozzle control governing

By-pass governing

All of these

109. For Parson's reaction steam turbine, degree of reaction is

75%

100%

50%

60%

110. Boiler mountings are necessary for

operation and safety of a boiler

increase the efficiency of boiler

both and

None of these

111. Babcock Wilcox boiler is

water tube type

fire tube type

both and

None of these

112. Range of high pressure boilers are

below 80 bar

above 80 bar

40to80bar

60to80bar

113. Dry ice is

free from water

free from dissolved air or gases

does not contain impurities

solidified form of carbon dioxide

114. A simple pitot tube is used to measure

pressure in a static fluid

velocity in a flowing stream

total pressure

dynamic pressure

115. The boundary layer on a flat plate is called laminar boundary layer if

Re is less than 2000

Re is less than 4000

Re is less than 5 × 105

None of these

116. Capillary action is due to the

viscosity of liquid

cohesion of liquid particles

surface tension

None of these

117. Cavitation is caused by

high velocity

low barometric pressure

high pressure

low pressure

118. Power required to drive a centrifugal pump is proportional to

Speed

N2

N3

1/N2

119. Continuous chip may be formed while machining

brittle material

hard material

tough material

ductile material

120. In which type of welding, molten metal is poured for joining the metals

Arc welding

Thermit welding

MIG

TIG

121. Grey iron is usually welded by

Arc welding

Gas welding

TIG

MIG

122. The process of cutting thin gears from metal sheet is known as

extruding

stamping

sintering

rolling

123. Which wood can be used for making patterns

Mahogany

Pine wood

Teak wood

Any of these

124. Cohesiveness of sand depends on

grain size and shape of sand particles

bounding material

moisture content

All of these

125. Electronic components are often joined by

adhesive

soldering

brazing

welding

126. Which of the following is basically a polishing operation

Soft grinding

Lapping

Honing

Buffing

127. The depth of cut depend on the

cutting speed

tool material

rigidity of machine tool

All of these

128. The commonly used material for thermocouples is

chromel copper

chromel alumel

platinum rhodium

Any of these

129. The gases used in tungsten inert gas welding are

helium and neon

argon and helium

ozone and neon

None of these

130. The chemical formulae for Freon 12 is

CHClF2

CH3Cl

CCl2F2

None of these

131. The function of a regenerator in a gas turbine is to

reduce heat loss in exhaust

permit use of higher compression ratio

improve thermal efficiency

None of these

132. The bottom ring on the piston is known as

oil ring

scraper ring

compression ring

groove ring

133. A fly cutter is used on

lathe

capstan lathe

metal spining lathe

milling machine

134. The flow rate through a circular pipe is measured by

Pitot tube

Venturimeter

Orifice meter

both and

135. A pump is defined as a device which converts

hydraulic energy into mechanical energy

mechanical energy into hydraulic energy

kinetic energy into mechanical energy

None of the above

136. The following is a vertical type boiler

Lancashire boiler

Cornish boiler

Cochran boiler

Locomotive boiler

137. A boiler mounting used to put-off fire in the furnace when water level in the boiler falls below a safe limit

Blow off cock

Stop valve

Feed check valve

Fusible plug

138. In a Brayton cycle, the air enters the compressor at 300 °k and maximum temperature of cycle is 1200 °k. What will be the thermal efficiency of cycle for maximum power output

75%

25%

50%

None of these

139. In an engine working on Otto cycle, air-fuel mixture is compressed from 400 C.C. to 100 C.C. If . 1.5, calculate the thermal efficiency of cycle.

50%

55%

68%

None of these

140. The engine part that joins piston and piston rod is called

piston crown

piston ring

crank pin

gudgeon pin

141. The process of scavenging is related to

two stroke engine

four stroke engine

gas turbine

compressor

142. An axial flow compressor will have symmetrical blades for a degree of reaction

25%

50%

75%

100%

143. The function of lubrication in engines are

lubrication and cooling

cleaning, sealing and noise reduction

efficiency enhancement

both and

144. A reciprocating compressor having 0.20 m bore and 0.25 m stroke runs at 600 rpm. If the actual volume delivered by compressor is 4 m3/min, its volumetric efficiency will be about

70%

75%

80%

85%

145. In which cycle, all the four processes are not reversible

Carnot cycle

Joule cycle

Vapour compression cycle

None of these

146. Wet compression in vapour compression cycle means

presence of water in refrigerant vapour during compression

presence of liquid refrigerant in refrigerant vapour during compression

compression of liquid refrigerant only

compression of water only

147. In an ideal vapour absorption system, the absorber pressure is equal to the pressure of

generator

condenser

evaporator

expansion device

148. If h is enthalpy of dry air, his enthalpy of water vapour and w is specific humidity, the av enthalpy of moist air will be

ha+hv

ha+whv

hv +wha

hv

149. A sample of moist air is at a DBT of 25 WBT of 18 °C and DPT of 13 °C and corresponding saturation pressures of water vapour are 3.0 kPa, 2.0 kPa and 1.5 kPa respectively. What will be the relative humidity of air

47%

50%

65%

None of these

150. In summer air-conditioning, the room is maintained at the following conditions

21 °C DBT, 50% RH

21 °C DBT, 60% RH

25 °C DBT, 50% RH

25 °C DBT, 60% RH

151. If sensible heat load and latent heat load in a building are in the ratio sensible heat factor will be

0.67

0.33

0.75

0.25

152. The centre of pressure of a plane submerged surface

should coincide with centroid of surface

should coincide with centroid of pressure prism

may be above or below centroid

cannot be above mentioned

153. Bernoulli's equation can be derived from

Continuity equation

Newton's law of viscosity

Reynold transport theorem

Euler's equation

154. If velocity of flow through a pipe is doubled, the head loss due to friction becomes

two times

four times

eight times

half

155. If the level of water above the base point of V notch is increased by four times, the discharge through the notch will become

4 times

8 times

16 times

32 times

156. Uniform flow in a channel is characterised by

the flow is uniform across the channel.

the total energy remains constant along the channel.

specific energy remains constant along the channel.

total energy line either rises or falls depending on Froude number.

157. Of the various methods of measuring discharge through a pipe line, the one with the least loss of energy and direct reading is by

venturimeter

orifice meter

flow nozzle

traversing a pitot-static probe

158. A jet of water of 0.002 m2 area moving with a velocity of 15 m/s strikes on a series of blades moving with a velocity of 6 m/s. The force exerted on the blades will be

0.18 N

270 N

27N

180N

159. If jet ratio of a Pelton turbine is the number of buckets will be

8

23

19

31

160. A turbine is coupled with alternator to generate electricity. If number of pair of poles in alternator are 6 and the frequency of electricity is 50 Hz, what should be the speed of the turbine

250 rpm

500 rpm

1000 rpm

3000 rpm

161. Following is an inward mixed flow reaction turbine

Pelton turbine

Francis turbine

Kaplan turbine

None of these

162. In Kaplan turbine, the number of blades is generally

2to4

4to8

8to16

16to24

163. N.P.S.H. stands for

Net Positive Supply Head

Net Power Supply Head

Net Positive Suction Height

Net Positive Suction Head

164. Wet bulb depression is equal to

WBT DPT

DPT WBT

DBT DPT

DBT WBT

165. Air washer is a plant used for

cleaning air

washing air

year round air-conditioning

None of these

166. Solid solution of carbon in gamma iron is called

austenite

sorbite

troostite

ferrite

167. The process of increasing the thickness of a bar at the expense of its length is called

drawing down

setting down

upsetting

None of these

168. Welding used for production of high quality butt welds in thicker steel plates is

resistance welding

gas welding

seam welding

submerged arc welding

169. Following is natural defect found in timbers

pitch

heart shakes

medulla

both and

170. The tool used for removing nails from wood is

screw-driver

chisel

pincer

None of these

171. In gas welding, the following type of flame is used for welding brass, bronze and gold

neutral flame

reducing flame

oxidising flame

both neutral and reducing flames

172. The following type of welding is used for joining rails and heavy pipes etc

laser beam welding

resistance welding

ultrasonic welding

thermit welding

173. Following is not a characteristic of powder metallurgy

complex shapes can be produced

bimetallic and laminated parts can be made

cost effectiveness

low production rates due to complex shapes

174. For good permeability of moulding sand, the following is not a desirable characteristics

higher percentage of silica

larger grain size

lower silt percentage

sand mixture containing grains of all sizes

175. The correct sequence of processes for getting smooth surface is as follows Grinding, II Honing, III Burnishing, IV Buffing)

IV II III

I II III IV

I II IV III

I III II

176. Following type of chip is produced while machining ductile metals with extreme pressure in cutting zone and high local temperature

continuous chip

continuous chip with built up edge

discontinuous chip

discontinuous chip with built up edge

177. The value of for High Speed Steel tool in Taylor's relation VTn constant is in the range

0.1 to 0.15

0.2 to 0.4

0.4 to 0.6

None of these

178. The

multipoint cutting tool

tool used in the shaper is a

single point cutting tool

None of these

179. Heli 10° to 15° 20° to 24° x angle for most of the drills lies from

10° to 15°

15° to 20°

20° to 24°

24° to 30°
180. Select the most appropriate alternative about cutting fluids.

It reduces heat generation.

It wash away the chips from metal.

It reduces energy consumption.

All of these