| Post Name | JUNIOR INSTRUCTOR (MECHANIC DIESEL) (Industrial Training Department) |
|---|---|
| Question Paper Code | 012/2025 |
| Category Code | 658/2023 |
| Date of Test | 27 January 2025 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The thickness between the two flutes in a drill is called :
Answer
A. Web
2
What is the accuracy of vernier bevel protractor?
Answer
D. 5 minute
3
What is the angle of centre punch?
Answer
D. 90 degree
4
A cutting tool used to finish and enlarge a hole is known as :
Answer
A. Reamer
5
It is the process of removing very small chips from the metal surface by means of a sharp
edged tool, what is the tool called as?
Answer
B. Scrapers
6
The size of a vernier height gauge is specified by :
Answer
C. Height of the beam
7
The metal ring on the file handle is called :
Answer
B. Ferrule
8
The least count of an engineer’s steel rule is :
Answer
C. 0.5 mm
9
In combination set which head is used to mark and check 45 degree and 90 degree angle?
Answer
D. Square head
10
When using universal surface gauge which part is used to draw line parallel to the
datum edge?
Answer
B. Guide pin
11
Which of the following statement is / are correct about with a metric outside micrometer?
(i) Fixed measuring face is known as Anvil.
(ii) Fixed measuring face is known as spindle.
(iii) 0.01 mm accuracy can be got while measuring.
Answer
A. Only (i) and (iii)
12
Which type of instrument mentioned below is used to measure the height of the
projection?
Answer
D. Depth micrometer
13
On a Vernier Calliper, where are the main scale graduations marked?
Answer
A. Beam
14
Which instrument is used to check the endplay of a shaft?
Answer
B. Dial test indicator
15
Which part ensures uniform pressure on the measuring faces in the outside micrometer?
Answer
A. Ratchet Stop
16
Which of the following statement is / are correct about with a standard metric outside
micrometer?
(i) One complete revolution of the thimble, spindle moves a distance of 0.5 mm.
(ii) Thimble portion is knurled to provide good grip for holding and rotating the
spindle.
(iii) Spindle lock is provided on the thimble.
Answer
C. Only (i) and (ii)
17
Which of the following engine cylinder dimensions may be measured with a cylinder bore
gauge?
Answer
D. All of the above
18
Which of the following statement is / are correct for taking accurate measurements with
a Telescopic gauge?
(i) No other instrument is needed for taking measurements.
(ii) Suitable outside micrometer is needed for measurements.
(iii) Telescopic gauge is an indirect measuring instrument.
Answer
B. Only (ii) and (iii)
19
Which one of the instruments mentioned below is used to check the
concentricity of the outside dimensions of a shaft?
Answer
C. Dial test indicator
20
Which can be measured by a feeler gauge?
Answer
A. Gap between mating parts
21
The distance through which a screw thread advances axially in one complete turn is
called :
Answer
D. Lead of thread
22
Which is the tool to check the pitch diameter of an external screw thread?
Answer
C. Screw thread Micrometer
23
A rivet is specified by the diameter of its :
Answer
B. Shank
24
Which one of the following threads, is used on mechanical jack?
Answer
A. Square
25
A split pin is used for locking purposes in :
Answer
C. Castle nut
26
What is the shape of head of a thumb screw?
Answer
D. Circular
27
The surface joining crest and the root of an external ‘V’ thread is known as :
Answer
B. Flank
28
What is the name of arrangement made in a fastening system which is used to prevent
loosening of nuts due to vibration?
Answer
B. Spring washer
29
Which stress is acting on a key that is used in the fastening system on a shaft during
transmission of torque?
Answer
D. Shear stress
30
Which nut provided with Nylon ring in the groove?
Answer
C. Self-locking nut
31
The tool for holding and turning the threading die is called :
Answer
A. Die-stoke
32
Which of the following statement is / are correct regarding thread rolling process?
(i) It is a cold forming process.
(ii) In which tapered threads are formed on round roads by passing them between dies.
(iii) It is a hot forming process.
(iv) It improves the strength of the thread.
Answer
C. Only (i), (ii) and (iv)
33
Which of the following statement is /are correct about thread rolling machines make use
of flat dies?
(i) Thread is formed by a single pass of the moving dies.
(ii) Thread is formed by a multiple pass of the moving dies.
(iii) The grove of one die will slope in the opposite direction.
(iv) Both dies have slope in the same direction.
Answer
A. Only (i) and (iii)
34
Dies are used to cut thread :
Answer
A. Externally on a round bar of metal
35
Which of the following statement is / are correct about die head fitted on Capston and
Turrent lathes for forming threads on the ends of workpiece?
(i) It has self-opening characteristics.
(ii) Blades to be carried in the body of the die head.
(iii) Blade is not a part of the die head.
Answer
B. Both (i) and (ii)
36
Tap is usually made of :
(i) High speed steel
(ii) Carbon steel
(iii) Galvanised steel
(iv) Beryllium
Answer
A. Only (i)
37
Chipless tapping is a process of –––––––––––– using a forming tap.
Answer
C. Internal thread rolling
38
The second tap used after taper to cut threads on the inside of a hole is also called :
Answer
Question Cancelled
39
The combination of drilling and tapping in a single tool is termed as :
Answer
B. Drapping
40
Which of the following formula being used to calculate the diameter of tap drill size?
Where D – is the diameter of the tap drill size, T – is the diameter of the tap and
d – is the depth of thread?
Answer
C. D = T − 2d
41
Which of the following is/are pressure control valves used in the fluid power system?
(i) Sequence valves
(ii) Unloading valves
(iii) Sliding spool valves
(iv) Rotary valves
Answer
D. Both (i) and (ii)
42
The plug valves are mainly suitable for low pressure and low temperature application, it
is also called :
Answer
B. Cocks
43
–––––––––––– is a device used for storing the energy of a liquid in the form of pressure
energy.
(i) Hydraulic accumulator
(ii) Hydraulic intensifier
(iii) Hydraulic toggle
Answer
B. Only (i)
44
In a hydraulic jack the load on the ram can be lowered with the help of
Answer
A. Lowering screw
45
Which of the following statement is/are true about pressure regulator used in pneumatic
circuit?
Answer
A. Maintain a constant pressure irrespective of the fluctuation in supplying the
compressed air
46
Which of the following is/are not a component of a hydraulic barking system?
(i) Master cylinder
(ii) Proportioning valve
(iii) Expansion valve
(iv) Metering valve
Answer
C. Only (iii)
47
The primary function of the fluid coupling is to :
(i) Provide torque subtraction.
(ii) Provide torque multiplication.
(iii) Transmit power with same torque on the driving and driven shaft.
Answer
D. Only (iii)
012/2025 10 A
48
Which of the following is/are as rotary air compressor?
(i) Axial flow compressor
(ii) Radial flow compressor
(iii) Reciprocating compressor
(iv) Roots blower
Answer
D. Only (i), (ii) and (iv)
49
–––––––––––– is a device which converts pneumatic power into required mechanical
power by reducing the pressure of compressed air to atmospheric.
Answer
B. Air cylinder
50
Which of the following below is / are pneumatic check valve?
(i) Flap valve
(ii) Pressure limiting valve
(iii) Ball valve
(iv) Disc valve
Answer
C. Both (i) and (iii)
51
Engines with stroke/bore ratio less than 1 are called :
Answer
B. Oversquare engine
52
Which part of the Automobile engine is used Variable Resonance Induction System
technology?
Answer
B. Inlet Manifold
53
By increasing 10 KPa pressure, inside the radiator with the help of a pressure cap, the
boiling point of coolant will increase :
Answer
B. 2.5°C
54
Which theory states that the “detonation is caused due to the presence of peroxide
substance formed in nuclear drops of unvaporised fuel, which acts as foci for the sudden
ignition of the unburnt charge”?
Answer
B. Callender’s Theory
55
In Automobile Engine lubrication system, Bypass valve is fitted on :
Answer
B. Oil Filter
56
Vibration damper is a small flywheel which is fixed to :
Answer
B. Front end of crankshaft
57
Disadvantage of an Air cooling system is :
Answer
A. The volumetric efficiency is less
58
Which side of the piston is maximum thrust side, when the engine is running in
clockwise direction and seen from the front of the engine?
Answer
B. Left side of the piston
59
In a Four stroke Diesel engine, when the diesel fuel is injected into the engine cylinder?
Answer
C. At the end of compression stroke
60
Which type of Fuel injector gives, atomized fuel in cone spray form?
Answer
D. Pintle type
61
Which type of cold starting device is used in Stationary single cylinder diesel engines?
Answer
A. Decompression device
62
Which part of the engine stores the energy received in power stroke and keeps the
crankshaft rotating in idle stroke?
Answer
C. Flywheel
63
What is the speed of slow speed marine engines?
Answer
D. Below 350 rpm
64
Deflector pistons are used in :
Answer
A. Two stroke engines
65
A –––––––––––– is an engine whose framework does not move.
Answer
D. Stationary engine
66
In –––––––––––– Scavenging type, inlet and exhaust ports are provided on opposite
sides of cylinder.
Answer
B. Loop
67
In –––––––––––– type combustion chamber, the fuel is injected into an auxiliary
chamber, which houses almost full charge at the end of compression stroke and is nearly
spherical in shape.
Answer
C. Turbulance chamber
68
Which engine part have most difficult sealing problem?
Answer
D. Cylinder head
69
Which one of the following statement is not true about the Fuel Feed Pump?
Answer
B. It is mounted on Fuel Tank
70
Which one of the following is not a part of CRDI engine?
Answer
A. Fuel Injection Pump
71
Camshafts are driven by :
Answer
D. All of these
72
The purpose of harmonic balancer in crank shaft is :
Answer
B. For controlling torsional vibrations
73
Which among the following methods is used to control expansion of piston?
(i) Increasing the thickness of the metal in the head
(ii) Using cam-ground pistons
(iii) Using steel struts cast into the piston
Answer
D. All of them
012/2025 14 A
74
Which among the following statement/statements is true regarding shape of combustion
chamber?
(i) The wedge shaped combustion chamber increases the turbulence of the burning
mixture, but has high exhaust emissions.
(ii) The hemispherical combustion chamber provides fast burning.
(iii) The cup or bowl-in-piston combustion chamber reduces turbulence.
Answer
A. Only (i)
75
Which among the following statement/ statements is true in the case of pre combustion
chamber?
(i) Spark plugs are provided in both main combustion chamber and
pre combustion chamber.
(ii) The auxiliary intake valve admits a lean mixture
(iii) The primary intake valve admits a lean mixture
Answer
C. Only (iii)
76
The forward and rearward movement of the crankshaft is limited by:
Answer
B. Thrust bearing
77
In order to reduce scuff wear, the upper most compression ring is plated with :
Answer
Question Cancelled
78
To avoid slapping tendency, piston pin in some engines are placed :
Answer
C. Offset to major thrust side
79
The engine valves are closed by :
Answer
A. Valve springs
80
The material used for inlet valve is usually :
Answer
B. Silicon Chromium steel
81
Condition under which NOx is formed in an IC engine :
Answer
B. High temperature
82
Condition under which CO is formed in an IC engine :
Answer
C. Both
83
Which among the following favours knocking in SI engines?
Answer
D. All the above
84
In which of the following petrol engine fuel supply system, a hermetically sealed fuel
tank is used?
Answer
A. Pressure system
85
Which among the following is a constant venturi type carburetor?
Answer
Question Cancelled
86
The reducing agent used in Selective Catalytic Reduction is :
Answer
B. Ammonia
87
In a three way catalytic converter, the second converter controls :
Answer
D. Both HC and CO
012/2025 16 A
88
In CI engines, ignition lag increases with :
Answer
C. Decrease in compression ratio
89
In SI engines, the initiation of a flame front by a hot surface other than spark plug is
called :
Answer
D. All of these
90
Which among the following methods can be employed for controlling diesel knock?
Answer
B. Reducing delay period
91
In an electric circuit, the common point is the place where :
Answer
B. feed current divides
92
The capacity of a battery is determined by the number of plates per cell and :
Answer
C. size of plates
93
The minimum cranking speed in petrol engine usually is :
Answer
D. 60-80 rpm
94
A voltage that is fluctuating or pulsating should be measured with :
Answer
D. an analog voltmeter
A 17 012/2025
95
Current will pass through a Diode when it is connected :
Answer
B. in forward bias
96
In an Alternator the magnetic field is produced in the:
Answer
A. Rotor
97
A fuse in an electrical circuit ‘blows’ as the result of a high :
Answer
B. Current flow caused by a short circuit
98
Which type of winding is best suitable to produce a high starting torque in starter motor?
Answer
C. Series winding
99
A thermistor is used in an Alternator regulator to :
Answer
B. compensate for temperature change
100
The reason for internal battery discharge is :
Answer
A. Damaged plate separator
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