| Post Name | WORKSHOP INSTRUCTOR/INSTUCTOR GARDE II/DEMONSTRATOR/DRAFTSMAN GR II (ELECTRICAL ENGINEERING) |
|---|---|
| Department | Technical Education |
| Question Paper Code | 203/2014 |
| Date of Test | 29 November 2014 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Cells are connected in parallel in order to :
Answer
C. increase the current available
2
9 The combined resistance of two equal resistors connected in parallel is equal to ;
Answer
A. one half the resistance of one resistor
3
Superposition theorem can be applicable only to circuits having βββββββ elements.
Answer
D. linear bilateral
4
The speed of an induction motor :
Answer
C. decreases slightly with the increase of load
5
Which DC motors has approximately constant speed?
Answer
B. Shunt motor
6
Under the condition of resonance, RLC series circuit behaves as a: :
Answer
A. purely resistive circuit
7
AUJT contains:
Answer
D. | one pn junction
8
The ripple factor of a power supply is a measure of :
Answer
C. purity of power output - .
9
The synchronous speed for a 3 phase 6-pole induction motor is 1200 rpm. If the number of
poles is now reduced to 4 with the frequency remaining constant, the rotor speed with a slip
of 5% will be :
Answer
D. 1710 rpm
10
Adevice whose characteristics are very close to that of an ideal voltage source is :
Answer
C. a zener diode
11
When converting 7,000 nA to microamperes, the result is :
Answer
D. Twa
12
The βsheathβ is used in cable to: :
|
Answer
A. provide strength to the cable
13
When the speed at which a conductor is moved through a magnetic field ig increased, the
induced voltage?
Answer
A. increases
14
The induced voltage across a coil with 250 turns that is located in a magnetic field that is
changing at a rate of 8 Whis is :
Answer
B. 2,000 V
15
Slip of the induction machine is 0,02 and the stator supply frequency is 50 Hz. What will be
the frequeney of the rotor induced emf?
Answer
C. c) 1Hs
16
βThe eddy current loss in an a-c electric motor is 100 watts at 50 Hz. Its loss at 100 Hz will be :
Answer
D. 400 watts
17
L7. The armature of a de machine ts laminated to reduce :
Answer
A. Eddy current loss
18
18 Asingle phase Hysteresis motor :
Answer
Question Cancelled
19
βThe temperature of resistance furnaces can be controlled by changing the :
Answer
D. all of the above |
20
Fora line voltage V and regulation of a transmission line R:
Answer
Question Cancelled
21
The rotor frequency for a 3 phase 1000 RPM 6 pole induction motor with a slip of 0,04
if) βββββββH zz.
Answer
D. 2
22
When two transformers are operating in parallel, they will share the load as under?
Answer
Question Cancelled
23
Adβphase, 400 velts, 50 Hz, 100 KW, 4 pole squirrel cage induction motor with a rated slip
of 2% will have a rotor speed of :
Answer
B. 1470rpm~
24
Adβphase, 400 velts, 50 Hz, 100 KW, 4 pole squirrel cage induction motor with a rated slip
of 2% will have a rotor speed of :
Answer
Question Cancelled
25
The voltage at the two ends of a transmission line are 132 KV and its reactance ia 40 ohm.
The Capacity of the line is :
;
Answer
A. 435.6 MW
26
A synchronous motor is operating on no-load at unity power factor. If the field current is increased, power factor will become:
Answer
D. leading and current will increase
27
A d.c. shunt motor runs at no load speed of 1140 r.p.m. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full load speed in r.p.m. is :
Answer
D. 1080
28
The most suitable servomotor for low power applications is:
Answer
B. a d.c. shunt motor
29
A 400 kw, 3-phase, 440 V, 50 Hz induction motor has a speed of 950 r.p.m. on full load. The
machine has 6 poles. The slip of the machine will be :
Answer
D. 0.05
30
Ina salient pole synchronous machine (usual symbols are used) :
Answer
C. xq < xd
31
CRGO laminations in a transformer are used to minimise :
Answer
Question Cancelled
32
39 An Air-core transformer, as compared to iron core transformer, has :
Answer
C. no magnetic core lossΒ»
33
Transformer maximum efficiency, for a constant load current, occurs at -
Answer
D. unity power factor
34
24 A de series motor is running .at rated speed with rated excitation. The motor has two
resistance R, and FR, connected across the armature and the field respectively. Speeds above
the rated speed can be achieved by ;
Answer
Question Cancelled
35
Ade series motor is running at rated speed without any additional resistance in series. If an |
additional resistance is placed in series, the speed of the motor :
Answer
B. decreases
36
Plugging of de motors is normally executed by :
Answer
B. reversing the armature polarity |
37
The direction of induced emf in an armature coil of a de machine ts :
Answer
C. the same as that of current for the generator and opposite to that of the current
38
The wave form of the armature mmfina de machine is: 7
Answer
C. triangular
39
Mass of a proton is how many times greater than mass of an electron :
Answer
C. 1840 |
40
Conductance of any conductor is expressed as |
Answer
B. mbo
41
Two resistances R, and R, give combined resistances 45 Q and 1Q when they are
connected in series and parallel respectively. What would be the values of these resistances?
|
Answer
D. 1509 and3Q
42
Kirchhoffs second law is based on law of conservation of :
Answer
B. energy
43
Ampere second is the unit of -
Answer
D. charge.
44
An electric current of 6 Ais same aa:
Answer
B. 6 coulomb/second
45
The colour band sequence of a resistor is Yellow, Violet, Orange and Gold, The range in
which its value must lie so as to satisfy the tolerance specified is between : |
| |
Answer
B. 44.65 KW and 49.35 KW
46
The Secondary line voltage is maximum for which of the following connections :
Answer
C. Delta β Star
47
The crawling in an Induction Motor is caused by :
Answer
D. O) Tarmoniecs Developed in the motor |
2038/2014 8 oa.
|
48
Speed variations of a squirrel cage Induction motor are essentially similar to those of :
Answer
A. DC Shunt motor
49
The no-load ratio of a 50 Hz single-phase transformer is 6000/250 V. The maximum flux in the core is 0.06 Wb. What is the number of primary turns?
Answer
A. 440
50
A 230/2300 V transformer takes a no-load current of 5 A at 0.25 power factor lagging. The core loss is:
Answer
Question Cancelled
51
The power taken by a 3-phase load is given by the expression : |
Answer
B. J3V, I, cos?
52
A semiconductor ia formed by ββββββββ bonds.
|
Answer
A. Covalent
53
After firing an SCR, the gating pulse is removed, The current in the SCR will : |
Answer
A. Remains the same
54
The majority carriers in a semiconductor are produced by:
Answer
C. Doping
55
The leakage current in a crystal diode is due to :
Answer
D. Minority Carriers
56
A series resistance is connected in the zener circuit to :
Answer
B. protect the zener
57
Stray losses in an induction motor generally are : :
Answer
B. proportional to the square of the rotor current
58
What determines the thermal loading on the motor?
Answer
A. Duty/Load cycle
59
The speed of an AC motor depends on :
Answer
C. Both
60
Reduction in supply voltage by 10% will change the torque of the motor by :
Answer
Question Cancelled
61
Output power requirements of constant torque loads vary with : :
;
Answer
A. speed
62
Acrystal diode is a βββββββ- device. |
Answer
A. non-linear
63
A pn junction acts as
Answer
A. |
64
The rotor power output of a 3-phase induction motor is 15 KW and corresponding slip is 4%. |
The rotor copper loss will be : |
Answer
B. 625 W |
65
The busbar protection means protection of : |
Answer
D. All above
2035/2014 10 A
66
Acircuit breaker is able to open under :
Answer
C. fault conditions
67
Reactors are connected ββββββββ with the system.
Answer
A. in series
68
The distribution transformer is rated in:
Answer
C. KVA
69
Voltage of primary distribution syatem is: .
Answer
D. 11 KV |
70
Ifthe span is increased, the sag: |
Answer
B. increases
|
71
In India, the transmission of electric power is done by :
|
Answer
A. 3-phase, 3-wire system
72
Decimal 15 in binary system can be written aa :
Answer
D. 1111
β |
|
989 Tr eneeadine which of the following conficurations is normally used? |
73
In cascading which of the following configurations is normally used? |
Answer
C. c) CE
74
The input impedance of a transistor under forward bias is :
Answer
B. low
75
Motor preferred for blowers is :
Answer
C. .squirrel cage inductiobn motors
76
Slip rings are usually made of:
Answer
Question Cancelled
77
The colour code of a resistor of nominal value 2.7 KQ 10% is:
Answer
A. Red, violet, red and silver
78
A reluctance motor : -
Answer
Question Cancelled
79
A power transformer is a conatant :
Answer
D. main flux device
80
Permeance is the reciprocal of :
Answer
B. reluctance
81
The form factor of a sinusoidal wave is:
Answer
C. 141
82
_ $2. Which of the following is a ferromagnetic material?
Answer
D. Nickel
83
An oscillator converts :
Answer
B. d.c. power into a.c. power
84
The frequency of DC supply ia:
Answer
A. Zero
85
Relative permeability of vacuum is : ΰ΄
Answer
C. 1 ࡯ࡩ) 1ࡧ
4
B86. The basic unit of electric charge is :
86
The basic unit of electric charge is :
Answer
C. coulomb
87
Semiconductor material have ββββββββ Bonds.
Answer
B. covalent
88
The binary system uses power of βββββββββ for positional values.
*
Answer
A. 2
89
An active element is:
Answer
C. Current source
90
7. 0.ࡦ. motor is used to:
Answer
C. change electrical energy to mechanical energy |
91
β_ββββ instruments are most sensitive.
Answer
D. permanent-magnet moving coil
92
The most commonly used cell is :
Answer
A. lead-acid cell
93
The efficiency of a primary cell is about :
Answer
C. c) 70%
94
Inductance opposes ββββββββ- in current in a cireuit. |
Answer
C. change
95
When a magnet is heated
Answer
B. it loses magnetism |
96
Iron is ferromagnetic : |
|
Answer
B. below 770Β°C |
97
For the process of electrolysis, we require : |
|
Answer
A. 0.ࡦ. supply
98
The average value of sin ΞΈ over a complete cycle is:
Answer
A. zero
99
As compared to shunt and compound DC motors, the series DC motor will have the highest
| torque because of its comparatively β-ββββββββ- at the start. β
|
Answer
Question Cancelled
100
Moving-iron instruments have ββββββββ scale. |
Answer
A. squared
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