| Post Name | LECTURER IN MECHANICAL ENGG. - TECHNICAL EDUCATION(Govt. Polytechnics) |
|---|---|
| Question Paper Code | 129/2023 |
| Category Code | 065/2021 |
| Date of Test | 25 July 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
If D1 and D2 are two diagonal matrices, then :
Answer
Question Cancelled
2
The value of the determinant of a square matrix of order ‘4’ is the sum of how many number
of terms?
Answer
Question Cancelled
3
If A is any square matrix of order ‘n’, then Adj
Answer
D. A A
π π π π
4
The value of sin cos + cos sin is :
4 12 4 12
3
Answer
B. 2
1 1
5
The value of (1.01) 2 −
Answer
B. 0.01000
6
lim_{x→0}(1 + x/a)^(1/x) is:
Answer
C. e¹ᐟᵃ
7
The function f(x) = {x² sin(1/x), x ≠ 0; 0, x = 0} is:
Answer
B. differentiable at x = 0
8
The line y − x + 2 = 0 cuts the line joining (3, −1) and (8, 9) in the ratio:
Answer
B. 2 : 3
9
The area bounded by the curve y = x³, the y-axis, and the lines y = 1 and y = 8 is:
Answer
C. 45/4
10
The differential equation of all circles of radius ‘a’ is given by :
3 2
dy y 2 − x 2 dy 2 2 d y
2
Answer
B. 1 + = a 2
dx 2xy dx dx
3 3
d 2 y 2 2 2
dy 2 2 2
2 d y
2
dy
11
The alkaline salt present in the bricks, absorbs moisture from the air which on drying :
Answer
Question Cancelled
12
When heavy structural loads from columns are required to be transferred to a soil of low
bearing capacity, the most economical foundation is :
Answer
Question Cancelled
13
The error in measured length due to sag of chain or tape is known as :
Answer
C. Positive error
14
A staff reading taken on a point whose elevation is to be determined as on a change point is
called :
Answer
Question Cancelled
15
The workability of cement concrete can be improved by :
Answer
B. Increasing the quantity of cement
16
Zinc liners between the leaves of spring are sometimes used to :
Answer
B. Prevents squeaking
17
Consider the following statements regarding a CI engine :
(1) CI engine knock can be reduced by increasing compression ratio.
(2) Thermal efficiency of CI is lower relative to a SI engine.
(3) CI engines has a higher specific output relative to SI engine
(4) CI engines use leaner mixture relative to SI engine
Which of the above statements are correct?
Answer
C. 1 and 4
18
For the same compression ratio and heat input, the cycles in decreasing order of thermal
efficiencies are :
Answer
A. Otto, dual, diesel
19
If each fission of Uranium 235 releases 200 MeV, how many fissions occur per second to
produce a power of 1 MW?
Answer
C. 3.12 × 1016/sec
20
An aircraft flying horizontally at a speed of 900 Km/hr is propelled by a jet leaving the nozzle
at a speed of 500 m/s. The propulsive efficiency is :
Answer
D. 0.667
21
The curve representing Ohm’s law is :
Answer
C. Linear
22
A capacitor offers :
Answer
A. Easy path to AC but block DC
23
A series circuit has a resistor; capacitor combination is connected to a voltage source. If the
potential difference across the capacitor is equals to the potential difference of the source,
then the capacitor is :
Answer
D. Fully charged
24
A magnetic field can be defined as :
Answer
B. The space through which a magnetic force acts
25
A wire has a resistance of 12 Ω. It is bent and ends are connected in the form of a circle. The
effective resistance between the two points on any diameter of the circle is :
Answer
A. 3Ω
26
Select the resistance value of a resistor having the following colour band sequence :
Yellow, violet, gold, gold
Answer
C. 4.7 ± 5%
27
Form factor of a full-wave bridge rectifier is :
Answer
B. 1.11
28
The technique that SMPS utilizes to control the average value of output voltage :
Answer
C. PWM
29
State the number of data bits and number of address bits in Intel 8051 microcontroller :
Answer
A. 8 bits data and 16 bits address
30
CDMA is based on the technology
Answer
D. Spread Spectrum
31
Breakeven point can be lowered by :
Answer
D. reducing variable cost
A 7 129/2023
32
When ordering cost is increased to four times the EOQ will be increased to :
Answer
A. Two times
33
In a queuing theory the number of arrivals per unit time estimated by :
Answer
B. Poisson distribution
34
Process capability explains :
Answer
D. Maximum deviation of the measured variable of the component
35
In production planning and control the document which authorizes the start of an operation
in shop floor :
Answer
A. Dispatch order
36
In Time study the rating factor is applied to calculate :
Answer
D. Normal time of job
37
Which of the following statement is not correct?
Answer
Question Cancelled
38
Which of the following is not a technique of PMTS?
Answer
B. Stop watch time study
39
The type of layout suitable for group technology concept is :
Answer
D. Cellular layout
40
Operating Characteristic curve
Answer
C. Percentage of defective and probability of acceptance
41
Value is usually a relationship between :
Answer
A. Utility and Cost
42
In PERT and CPM network the dummy activity :
Answer
C. Is used to preserve the logic
43
The area under the beta distribution curve divided into two equal halves by a vertical
ordinate through :
Answer
C. expected time
44
Shadow price in linear programming refers :
Answer
C. value assigned to one-unit
45
Preheating is essential in welding :
Answer
B. cast iron
46
Which structure has maximum hardness?
Answer
B. Martensite
47
Tempering of hardened steel is done to increase :
Answer
C. ductility
48
Age hardening is generally applicable to :
Answer
D. alloys of alumnium, magnesium, nickel
49
What is the atomic packing factor for FCC crystal structure?
Answer
C. 0.74
50
Burgers vector in screw dislocation :
Answer
C. parallel to dislocation line
51
Which of the following material require largest size of riser for the same size of casting?
Answer
A. aluminum
52
When solidification starts iron will appear in which form?
Answer
C. Delta
53
In arc welding the arc length should be approximately equal to :
Answer
A. diameter of electrode
54
Chaplets is used in moulding process :
Answer
D. support the cores
55
Which method is used for the manufacturing of collapsible tooth paste tubes?
Answer
A. Impact extrusion
56
In atomic hydrogen welding hydrogen gas acts as :
Answer
A. Heating agent
57
Helical groove in twist drill is to :
(1) improve stiffness
(2) save tool material
(3) provide space for chip removal
(4) provide rake angle for cutting edge
Answer
C. (3) and (4)
58
Which one is not a synthetic abrasive material?
Answer
Question Cancelled
59
Stability of floating body depends upon :
Answer
C. its metacentric height
60
The value of coefficient of velocity depends upon :
Answer
D. friction at the orifice surface
61
In a flow measurement a Venturimeter is preferred over an orifice plate :
Answer
C. Energy or head loss is less
62
For maximum power transmission through a pipe line the frictional head loss equals :
Answer
A. H/3
63
In flow through a pipe the transition from laminar to turbulent flow does not depend :
Answer
C. length of pipe
64
Flow occurring in a pipe line when a valve is opened :
Answer
B. unsteady
65
Hydraulic grade line for any flow system as compared to energy line is :
Answer
B. Below
66
Air vessel is provided at the summit of a syphon :
Answer
D. avoid interruption in flow
67
For a given centrifugal pump :
Answer
B. discharge varies directly as speed
68
The work saved by Fitting an air vessel to a single reciprocating pump is :
Answer
D. 84.8%
69
Efficiency of Pelton wheel shall be maximum if the ratio of jet velocity to tangential velocity
of wheel is :
Answer
C. 2
70
The use of a draft tube in a reaction turbine helps to :
Answer
C. convert kinetic energy to pressure energy
71
Multi- stage centrifugal pump is used :
Answer
C. high head
72
Impulse turbine is generally fitted :
Answer
A. little above tail race
73
Which of the following about Poisson ratio is / are correct?
(1) Applicable with in elastic limit
(2) Ratio of lateral stress by longitudinal strain
(3) Ratio of lateral strain by longitudinal strain
(4) Ratio of longitudinal strain by lateral strain
Answer
B. only (1) and (3)
74
If Poissons ratio of material is 0.5 then elastic modulus of material is —————— the shear
modulus.
Answer
C. three times
75
Match the list :
In the cone of friction
List I List II
Answer
C. Base radius of cone (3) Resultant force
76
A perfect frame contains members equal to (n = no. of joints in frame) :
Answer
D. 2n − 3
77
Throat thickness of a single fillet lap joint is given by:
Answer
C. t/√2
78
A cylindrical pipe 1 m in diameter contains fluid at a pressure of 1 N/mm2. If the maximum
permissible tensile stress in metal is 20 N/mm2, the thickness of metal required would be :
Answer
A. 2.5 cm
79
The ratio of crippling load for a column of length (l) with both ends fixed to the crippling load
of the same column with both ends hinged according to Euler’s theory of long column is equal
to :
Answer
B. 4
80
The included angle of V-thread is :
Answer
C. 60°
81
Which type of screw is used in lead screw of a lathe?
Answer
D. Acme thread
82
Two intersecting shafts can be connected by —————— gear.
Answer
D. straight bevel
A 15 129/2023
83
Which of the following is an inversion of single slider crank chain?
Answer
B. Oscillation cylinder engine
84
The circle drawn to the cam profile with minimum radius is called the :
Answer
D. Base circle
85
If the axes of first and last gear of a compound gear train are coaxial the gear train is known
as —————— train.
Answer
C. reverted
86
The governor is said to be —————— when the speed of the engine fluctuates continuously
above and below the mean speed.
Answer
B. hunting
87
For some compression ratio and heat addition air standard efficiencies is of the order :
Answer
Question Cancelled
88
Two reference fuels used for Cetane rating are :
Answer
D. Cetane and α-methyl napthalene
129/2023 16 A
89
Which of the following is NOT a method to determine the friction power of an engine?
Answer
B. Wilson line
90
The purpose of ignition coil in an automobile ignition system is to :
Answer
A. step up the voltage in a spark plug
91
For thermosyphon cooling, radiator should be placed :
Answer
C. above the engine
92
Which one of the following heat exchangers gives parallel straight line pattern of
temperature distribution for both hot and cold fluid?
Answer
D. counter flow with equal heat capacities
93
The temperature distribution for a plane wall, for steady state heat flow and constant value
of thermal conductivity is :
Answer
B. linear
94
Prandtl number value greater than one indicates that hydrodynamic boundary layer is :
Answer
A. greater than thermal boundary layer thickness
95
The wavelength of maximum emissive power is given by :
Answer
C. Wein’s law
96
For a perfectly black body :
Answer
B. absorptivity = 1 reflectivity = 0 transmittivity = 0
97
Identify the correct statement :
Answer
B. centrifugal compressors are used to supply large quantities of air at a lower
pressure ratio
98
A two stage compressor takes air at 3.6 bar and discharges at 10 bar. For maximum
efficiency the intermediate pressure is :
Answer
C. 6 bar
99
One ton refrigeration is equivalent to :
Answer
A. 3.5 kJ/s
100
During adiabatic cooling of moist air :
Answer
D. wet bulb temperature remains constant
————————
129/2023 18 A
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