| Post Name | JUNIOR INSTRUCTOR (LIFT AND ESCALATOR MECHANIC) (Industrial) |
|---|---|
| Question Paper Code | 179/2024 |
| Category Code | 653/2023 |
| Date of Test | 18 December 2024 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Parallelism of bars and rods can be measured using :
Answer
B. Dial Gauge
2
No crane, hoist or rigging hardware shall be loaded beyond the rated capacity,
except for test purposes.
Answer
C. Only 2 is correct
3
A non-consumable electrode is used in :
Answer
D. TIG welding
4
Identify the correct statements from the following:
1. Inbrazing base metal is not being melted
2. In welding base metal is heated below melting point
Answer
B. Only 1 is correct
5
Which one is not a function of counter weight in an elevator?
Answer
D. Reduce the friction in movement
6
The safety mechanism used in elevators to prevent damage and injury in the event of an
elevator car free fall :
Answer
C. Buffer
7
A derrick without a boom and with single tower is known as :
Answer
B. Gin Pole
8
Select the temporary fastener from the following :
Answer
A. Nut and Bolt
9
Calculate the tension in the string as well as the acceleration of masses if there is
negligible friction between pulley and string.
Answer
B. 480 N, 2 m/s2
10
Distance moved by a threaded fastener in one revolution is called :
Answer
B. Lead
11
The apparent weight of a person of mass m in a lift moving downward with acceleration a can be expressed as (g = acceleration due to gravity)
Answer
C. m(g β a)
12
Select the correct statement from the following :
1. The operator shall be familiar with the crane or Hoist operating characteristics and
be aware of the safety rules for the operator.
2. No crane, hoist or rigging hardware shall be loaded beyond the rated capacity,
except for test purposes.
Answer
A. Both 1 and 2 are correct
13
Identify the standard elevator component from the following :
Answer
D. All the above
14
Which safety feature stops elevator doors from closing if an obstacle is detected?
Answer
B. Photocell sensor
15
What standard must safety goggles meet to ensure they provide adequate protection?
Answer
B. ANSI Z87.1
16
Viscosity of petroleum oil for hydraulic lift is ββββββ.
Answer
B. Low
17
What is the purpose of the machine beam in a lift system?
Answer
B. To support elevator equipment
18
The process of lubrication in elevator comes under which type of maintenance
Answer
B. Routine maintenance
19
ββββββ is the distance between the car buffer striker plane and the striking
surface of the car buffer.
Answer
B. Bottom car run by
20
Which operation is affected by power failure on elevator?
Answer
C. Motor operations
21
From the following list which rotating elements is used to transmit power from one part
to another part of machine?
Answer
C. Shaft
22
The device used to correct elevator car level on both under run and over run is
Answer
A. Levelling device
23
Which device is used to prevent reversal of direction of escalator?
Answer
C. Speed governor
24
Which one from the following is the purpose of pit switch?
Answer
B. Stop lift
25
Choose the safety component used in electrical traction elevator.
Answer
A. Progressive gear
26
Name the type of gear used to transmit power from one rotating shaft to another whose
axes are neither parallel not intersecting.
(1) Spur gear
(2) Spiral gear
(3) Worm gear
(4) Crown gear
Answer
Question Cancelled
27
βBoth of the hoist way doors operates on same side one after otherβ- Identify the type?
Answer
B. Telescopic door
28
Which is the name of scaffold parts and items?
Answer
B. Putlog end
29
Which switch operates before the car come into contact with the buffers?
Answer
A. Final limit switch
30
The safety device to stop descending car and counter weight beyond normal limit in car
is known as
Answer
A. Over Speed Governor
31
How to inspect the engagement between the combs and the steps of escalator?
Answer
D. Move escalator up and down by inch button
32
How to eliminate hazard to trip an over speed governor located in a hoist way?
Answer
B. Remote tripping
33
SWL Means :
Answer
C. Safe working load
34
Which is known as corrective maintenance?
Answer
B. Breakdown maintenance
35
What is the function of emergency lights provided in lift car?
Answer
B. To indicate the control switches
36
The arrangement of Escalators that minimizes the structural space requirements by
βstackingβ escalators that go in one direction is :
Answer
C. Crisscross
37
The device which automatically actuates safety devices in the even of equipment
over-speed is :
Answer
B. Governor
38
The semi-circle-shaped end of a balustrade at the upper and lower landing housing the
switches for on/off, emergency etc. is :
Answer
A. Newel
39
Which component is used to detect people entering or leaving the car?
Answer
B. Infrared
40
What is the steps clearance through step run in guide of escalator?
Answer
A. 1 mm
41
The device used to prevent the reversal of the direction of the escalator is:
Answer
C. Speed governor
42
Identify the input control system component is the elevator :
Answer
A. Sensors
43
The enclosure at either side of the moving steps, the decking or deckboard outside the
moving handrails is known as :
Answer
B. Balustrading
44
Which of the following is a common material for bearing bushes?
Answer
C. Gun Metal
45
Which among the following forms a part of an assembly that supports another part in
the assembly?
Answer
B. Bearing
46
Which of the following is not true about worm gears?
Answer
C. Low speed reduction
47
The tangential force on worm for a certain lifting operation is 1,500 N, then axial force
on worm wheel will be :
Answer
B. 1,500 N
48
Statement 1 : Worm gears are used in mechanisms for lifting operations.
Statement 2 : Worm gears are advantageous to use in lifting operations as they
support self-locking operation.
Answer
C. Both statements are correct and statement 2 is correct explanation to
statement 1
49
The correct expansion of OSG in lift operation is :
Answer
D. Over Speed Governor
50
Which of the switch Functions before the lift - car come into contact with the buffers?
Answer
B. Final limit switch
51
What is the form factor for sinusoidal AC?
Answer
B. 1.11
52
What is the reciprocal of reactance in an AC parallel circuit?
Answer
D. Susceptance
53
What is the power factor in a 3 phase power measurement of two wattmeters showing
equal readings?
Answer
D. 1
54
How much electrical energy is consumed in an electric iron rated as 750W/250V used for
90 Minutes?
Answer
C. 1.125 kWh
55
Which of the following materials has highest electrical conductivity?
Answer
D. Silver
56
The capacitor are used across AC supply for
Answer
B. Power factor improvement
57
In an Inductive AC circuit, current
Answer
C. Lags behind the Voltage by 90Β°
58
The Capacitive Reactance
Answer
A. Decreases as frequency increases
59
What is the phase displacement in a 3-phase AC circuit ?
Answer
D. 120ΒΊ
A 9 179/2024
60
The unit of impedance is
Answer
A. Ohms
61
βββββββββ is the measure of how much potential difference the insulation layer can
withstand without breaking down.
Answer
D. Dielectric strength
62
Which cell is most often used in digital watches?
Answer
B. Mercury
63
What is the term for the time taken by a fuse to interrupt the circuit in fault?
Answer
D. Cutt-off factor
64
What is the purpose of ELCB?
Answer
B. Monitors the residual current
65
Oxygen is an example of :
Answer
A. Para magnetic substance
66
What is the tool used to bend conduits?
Answer
B. Hickey
67
What rule is applied to find the direction of magnetic fields in a solenoid coil?
Answer
B. Right hand palm rule
68
What is the permissible leakage current in domestic wiring installation?
Answer
A. 1/5000 Γ full load current
69
What is the reason for supplying AC to the electrodes for measuring earth resistance?
Answer
D. Avoid the effect of electrolytic emf interference
70
SI unit of permeance :
Answer
B. Henry
71
Which rule is used to find the direction of induced emf in DC Generator?
Answer
D. Flemings right hand rule
72
Why Compensating Winding is provided in large DC Generators?
Answer
C. Neutralize armature reaction effect
73
How many parallel paths in Duplex Lap Winding in the armature of 4 pole DC motor?
Answer
D. 8
74
Which DC Motor is suited for Heavy starting torque and high rate accelerated jobs?
Answer
A. DC Series Motor
75
What is the rotor frequency of 3 Phase squirrel cage induction motor at the time of
starting?
Answer
A. Equal to supply frequency
76
What is the reason to use a permanent capacitor in Fan Motor circuit?
Answer
C. Splitting of phase for torque
77
As per IE Rules, clearance of low and medium voltage lines from building, vertical
clearance is?
Answer
D. 2.5 meter
78
As per IE Rules, the permissible voltage drop in a lighting circuit is ___________
percentage of supply voltage plus 1 volt.
Answer
A. 2
79
The transformer is rated in:
Answer
B. KVA
80
The condition for maximum efficiency for DC Generator:
Answer
D. Variable loss = constant loss
81
The impurities like antimony or phosphorus added to intrinsic semiconductor to form :
Answer
B. N-type doped semiconductor
82
What is the meaning of maximum safe reverse voltage rating of a diode?
Answer
D. PIV
83
When the depletion region within a PN junction is reduced?
Answer
C. Forward bias condition
84
Which is the current ratio Beta ( Ξ² ) in a transistor?
Answer
A. IC/IB
85
The operating point of a transistor is also known as :
Answer
D. quiescent point
179/2024 12 A
86
What is the advantage of using bias in transistor circuits?
Answer
C. Never reach saturation
87
The function of a filter circuit in a rectifier is to :
Answer
B. Remove ripples from rectified output
88
The formula for calculating the efficiency of a rectifier is =
Answer
D. P_DC/P_AC Γ 100%
89
What is the output frequency of the pulsating DC in a two diode full-wave rectifier?
Answer
A. Double the input AC frequency
90
Which of the transistor amplifier has highest voltage gain given below?
Answer
C. Common emitter configuration
91
A sine wave signal when observed on CRO, has positive half cycles measured as
2 divisions horizontally at a scale setting of 50 uS/div. The frequency of the signal is :
Answer
A. 5 KHz
92
In RC phase shift oscillator, Zi is input impedance and Zo is output impedance. Then :
Answer
C. Zi of amplifier > Zo of phase shift network
93
In the following counters, which one cannot count 1011 :
Answer
C. Decade counter
94
Which of the following binary combinations are correct?
(i) 100 + 110 = 1010
(ii) 111 + 11 = 1010
(iii) 11 Γ 10 = 1010
(iv) 2βs complement of 0110 is 1010
Answer
B. only (i), (ii) and (iv)
95
If the voltage applied across base terminals of UJT is 12 V and intrinsic
stand-off ratio is 0.6, find the minimum voltage at emitter to conduct emitter current :
Answer
D. 7.9 V
96
Which of the following component can be turned on or off by applying proper pulse to the
cathode gate?
Answer
D. GTO
97
A JFET is biased by the potential-divider method. It is desired to set drain current I_D = 5 mA. If V_DD = 30 V, find the gate-source voltage V_GS. The JFET parameters are I_DSS = 20 mA and V_GS(OFF) = β10 V.
Answer
B. β5V
98
Which of the following is / are correct?
(i) AC Drive has rectifier and inverter units
(ii) AC Drive controls speed of AC motor
(iii) VFD is a type of motor controller that adjusts frequency and voltage supplied to the
motor, to control its speed
(iv) Microcontrollers are not used in VFD
Answer
A. Only (i), (ii) and (iii)
99
Back-up delay time of inverter is around :
Answer
B. 500 mS
100
Which Flip-Flop have Race around condition?
Answer
C. J-K Flip-Flop
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