| Post Name | Dental Equipment Maintenance Technician - Health Services |
|---|---|
| Question Paper Code | 220/2023 |
| Category Code | 525/2022 |
| Date of Test | 7 November 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
How many numbers of cuts in a 250 mm flat bastard double cut file over a length in
1 cm ?
Answer
D. 10
2
Which is the angle of an edge of a triangular file ?
Answer
B. 60 degree
3
Which is the most suitable pitch of a hack-saw blade cutting mild steel or cast iron ?
Answer
A. 1.8 mm
4
While chipping, the clearance angle is the angle between
Answer
B. The working surface of the job and the bottom surface of the cutting edge of
chisel
5
Which punch is used to locate the drill bit ?
Answer
C. Centre punch
6
In the following which is not the use of atry square ?
Answer
A. measuring right angle
7
Which is the symbol conventionally used for resinoid bond ?
Answer
C. ‘B’
8
Which hammer is used for hammering inside curves for bending ?
Answer
D. Cross-peen hammer
9
Which head is used to set at any required angle in the combination set ?
Answer
B. Protractor head
10
What is the accuracy of the surface of lapped and machined surface plate ?
Answer
Question Cancelled
11
Which of the following statement is/are correct about BSW thread ?
i. BSW thread has an included angle of 55°.
ii. depth of the thread is 0.6134 × Pitch.
Answer
A. Only i
12
Which of the following statement is/are correct about BA thread ?
i. BA thread has an included angle of 47.5°.
ii. BA threads are used in small screws of electrical appliances, watch screws,
screws of scientific apparatus.
Answer
C. All of the above (i and ii)
13
What is the included angle of metric acme thread ?
Answer
B. 30°
14
Which of the following thread, one flank is perpendicular to the axis of the thread and
the other flank is at 45° ?
Answer
D. Buttress thread
15
Which of the following statement is/are correct about pitch diameter of a thread ?
i. It is the smallest diameter formed after an external thread is cut.
ii. It is the largest diameter over which a thread is cut in the case of an external
thread.
iii. It is the diameter of an imaginary cylinder which passes through the thread
such that the width of the space is equal to the width of the thread.
Answer
C. Only iii
16
Which of the following statement is/are correct about square and trapezoidal
threads ?
i. Square and trapezoidal threads have more cross-sectional area than ‘V’
threads.
ii. Square and trapezoidal threads are more suitable to transmit motion or power
than ‘V’ threads.
iii. Square and trapezoidal threads are not used for fastening purposes.
Answer
D. All of the above (i, ii and iii)
17
Which of the following is the horizontal distance from a point on one thread to the
corresponding point on the adjacent thread measured parallel to the axis ?
Answer
C. Pitch
18
When a single helix is making a screw, it is called
Answer
A. Single start thread
19
Which of the following statement is/are correct about multi-start threads ?
i. In multi-start threads, the lead of the helix increased without increasing the
pitch.
ii. lead = Pitch × Number of starts in multi-start threads.
iii. A multi-start thread makes it possible to keep the depth of thread less and
provides a rapid axial movement of the screws.
Answer
D. All of the above (i, ii and iii)
20
Which of the following is the surface connecting the crest and the root of a thread ?
Answer
B. Flank
21
One kWh of energy equals nearly
Answer
B. 860 kcal
22
Induction watt hour meters are free from __________ errors.
Answer
A. Frequency
23
A coil has an inductance of 1 Henry, if current changing at the rate of 2A/sec
induces
Answer
B. Two volt in it
24
To convert a simple meter into a voltmeter, the resistor has to be connected in
Answer
C. Series
25
Which of the following variety of copper has the best conductivity ?
Answer
B. Pure annealed copper
26
A moving iron instrument can be used for
Answer
D. Both AC and dC
27
Which resistor has negative temperature co-efficient ?
Answer
A. Thermistor
28
The resistance between the opposite faces of a meter cube of a material is
known as
Answer
C. Resistivity
29
In a capacitor, the electric charge is stored in
Answer
C. dielectric
30
Why the ohm meter is graduated with non-linear scale ?
Answer
D. Current is inversely proportional to resistance
31
Which of the following is a ferrous metal ?
Answer
B. Cast iron
32
Steel is an alloy of iron and carbon. How much is the maximum quantity of carbon
content in steel ?
Answer
A. 1.5%
33
What is meant by creep ?
Answer
D. The slow and continuous deformation of a material under steady load
34
What is the melting point of lead ?
Answer
C. 326°C
35
Which of the following is an Aluminium alloy ?
Answer
B. y-Alloy
36
Which of the following is not the property of zinc ?
Answer
C. It melt at 231.5°C
37
Which of the following is measure of stiffness ?
Answer
A. modulus of elasticity
38
What is the composition of Brass ?
Answer
A. Copper and zinc
39
Which of the following material has the maximum ductility ?
Answer
B. mild steel
40
What is the function of lead as an alloying element ?
Answer
C. To improve machinability
41
Which of the following is a part of Taly-surf ?
Answer
D. All of the above
42
Roughness value 0.2 to 0.8 microns is indicated by which symbol ?
Answer
C. Three inverted triangles
43
When a circle is added to the basic symbol of two legs of unequal length inclined at
approximately 60°, what is meant by the surface symbol indication ?
Answer
B. The material removal is not permitted
44
Which of the following process give maximum surface finish ?
Answer
D. lapping
45
The lines or patterns on the work surface caused by the movement of the cutting
tool is called
Answer
C. Surface texture
46
The quantity of heat required to change unit mass of substance completely from one
state in to another at constant temperature is
Answer
C. Latent heat
47
What is the unit of heat in SI system ?
Answer
B. Joule
48
The mode of heat transfer which doesn’t require a medium is
Answer
A. Radiation
49
The SI unit of pressure is
Answer
C. Pascal
50
In Fahrenheit scale, the boiling point is fixed at
Answer
D. 212°F
51
The pressure measured greater than atmospheric pressure is called
Answer
B. Gauge pressure
52
The temperature range of oxy-acetylene flame is
Answer
D. 3100°C to 3300°C
53
The instrument used to measure very high temperature of furnace is
Answer
B. Pyrometer
54
The metal joining process in which the work-pieces are not heated is called
Answer
D. Soldering
55
The most active soldering flux group is
Answer
A. Inorganic fluxes
56
Which type of oxy-acetylene gas flame is widely used for welding mild steel material ?
Answer
B. Neutral flame
57
In leftward welding technique of oxy-acetylene gas welding, the blow pipe is held at
an angle between
Answer
D. 60° to 70°
58
The type of AC arc welding transformer is
Answer
B. Step down transformer
59
Hydrochloric acid is used as flux for soldering which material ?
Answer
C. Zinc
60
Which among the following is not a method of Brazing ?
Answer
A. Electroslag Brazing
61
Which of the following statements is/are correct about pattern making in casting ?
i. Wood is the most common material for making patterns for castings.
ii. When a metal pattern is cast itself using a wooden pattern, then the wooden
pattern is called a dummy pattern.
iii. A good pattern is one which can be easily worked, shaped and joined and
should be light in weight.
iv. Plastics are not used as pattern material for casting.
Answer
D. Only i and iii
62
Arrange the below stages of casting as per their order of manufacturing sequence.
a. Testing and inspection
b. melting and casting
c. moulding and core making
d. Fettling
e. Pattern making
Answer
C. e – c – b – d – a
63
match list – I with list – II below :
List – I List – II
P. lost wax process a. die casting
Q. Centrifugal casting b. Investment casting
R. Permanent mould casting c. Plaster of Paris
S. Plaster mould casting d. Rotating mould
P Q r S
Answer
C. b d a c
64
Which of the following statements is/are false about sand casting ?
i. The intermediate mould section between cope and drag is known as cheek.
ii. Cope refers to the lower half containing the bottom half of the pattern.
iii. drag refers to the upper half containing the top half of the pattern.
iv. The proper design of tapered sprue is necessary to avoid aspiration effect.
Answer
B. ii and iii only
65
Which statement is true about hot chamber die casting ?
Answer
A. In hot chamber die casting, the melting unit constitutes an integral part of the
process.
66
Which statement is false about centrifugal casting ?
Answer
C. To form the internal shape; pressure is generally obtained by compressed air
or hydraulically.
67
Which among the following is a limitation of sand casting ?
Answer
D. The product gives a rough surface
68
Pump is used for increase the pressure in
Answer
A. Pipe lines
69
Select the Reciprocating pumps are following
Answer
C. (A) and (B)
70
Compressed air pump can lift water from a depth of _________ meter.
Answer
D. 150
71
Priming is a process of filling up water in the
Answer
C. Casing and suction pipe
72
What are the main components of a centrifugal pump ?
Answer
D. (A), (B) and (C)
73
In a vernier caliper, movable jaws are the parts of which unit ?
Answer
B. Vernier slide
74
In which part of micrometer one end forms measuring face and the other end is
threaded and the tapered nose is fitted on it ?
Answer
C. Spindle
75
Which instrument is used to measure sizes from the lower plane with the help of
an offset scriber ?
Answer
A. Vernier height gauge
76
What is the least count of depth micrometer ?
Answer
C. 0.01 mm
77
Which instrument is used to measure the diameter of holes and the distance
between internal parallel surfaces like slots ?
Answer
B. Inside micrometer
78
In which instrument the distance or the measurements are read from lCd/lEd
display ?
Answer
A. digital caliper
79
In a vernier caliper, the main scale divisions (9 mm) are divided into 10 equal parts
in the vernier scale. What is the least count of this vernier caliper ? Here one main
scale division is (1 mm).
Answer
B. 0.1 mm
80
Which device is fitted on micrometers to ensure uniform pressure between the
measuring faces of the micrometer while measuring ?
Answer
C. Ratchet stop
81
Which is the personal safety ?
Answer
B. Concentrate on your work
82
Which is the immediate life saving procedure ?
Answer
A. First aid
83
What ‘A’ denotes in ABC of ‘First aid’ ?
Answer
A. Air way
84
Which of the following activity to be performed for better up keep of working
environment ?
Answer
B. Cleaning the shop floor
85
What is the shape of warning signs ?
Answer
B. Triangular
86
What is the ratio of 4 kg to 800 grams ?
Answer
A. 5 : 1
87
How many millimetres are there in 12 inch ?
Answer
B. 304.8 mm
88
divide : ÷ .
31 62
4 3 1 2
Answer
D. 2
3 2 3 3
89
What is the percentage of copper in the casting if the weight of copper is 42.3 kg
and weight of tin is 2.7 kg ?
Answer
C. Cu 94%
90
What is the length of copper wire, if the copper wire weights 8 kg, density of
copper is 8.9 g/cm3 and cross-sectional area is 0.636 cm2 ?
Answer
D. 1413.33 cm
91
Two turners need three days to produce 20 pieces. How long does it takes for
6 turners to produce 30 such pieces ?
Answer
C. 1.5 days
92
A cylindrical tank 2 m diameter × 3.5 m deep is filled with petrol. Find the weight of
petrol in tonnes, assume density of petrol is 720 kg/m3.
Answer
B. 7912.8 Tonnes
93
The lower limit of a dimension, stated as 23H7 in a drawing is
Answer
C. 23.00
94
If a shaft size 38 − 0.01 mm mates with a hole of size 38 − 0.01 mm, the maximum
interference in the assembly is
Answer
B. 0.04
95
Find the maximum clearance in mm if a hole of size 27 + 0.02 mm is assembled with
−0.005
a shaft of 27 − 0.025 mm size.
Answer
D. 0.045 mm
96
A basic hole means
Answer
B. lower deviation is zero
97
The relation between mating parts in an assembly is termed as
Answer
C. Fits
98
The difference between the size of manufactured product and the corresponding
nominal size is termed as
Answer
C. Actual deviation
99
Which of the following statements is correct regarding ‘‘minimum Clearance’’ ?
Answer
D. difference between minimum size of hole and maximum size of shaft.
100
If the allowance of 0.03 mm for clearance is given and the shaft diameter is 18 mm,
find the design size.
Answer
B. 17.97 mm
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