Download Model test (sem-II)

ELECTRICIAN
TIME: 3Hours
Note:-Attempt all questions.
TRADE THEORY (Model test)
Semester-II
Mark:150
All questions carry equal marks.
1.
Marks:3
How many light points are allowed in one circuit?
A. 10 Points
B.15 Points
C.20 Points
D. any Point
2.
Marks:3
A ceiling fan shall be hung at a height not less than
________ from the floor.
A. 2.5Mts
B. 1.5 Mts
C. 3 Mtrs
D. 1.75 Mts
3.
Marks:3
The distance between clips in horizontal runs shall
not exceed_________
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm
4.
Marks:3
Staircase point is operated with ____________.
A. two one-way switches
B. Two two-way switches
C. Two intermediate switches
D. None of above.
5.
Marks:3
The fuse rating is expressed in terms of _________.
A. Voltage
B. Current
C. KVA
D. VAR
6.
Marks:3
In the case of 3-pin sockets, the phase wire should
be controlled through a switch and should be
connected to the _________.
A. Bottom left side terminal
B. Bottom right side terminal
C. Any side at the bottom terminal
D. The connection depends upon plug connection.
7.
Marks:3
During a continuity test, dead short in an
installation is indicated in a megger by _________.
A. 0 M
B. 500 M
C.  M
D.1 M
8.
Marks:3
If the slip rings are connected to the rotating
armature conductors of a generator, the output will
be _______.
A. An alternating current
B. A direct current
C. A pulsating current
D. An oscillating current.
9.
Marks:3
The armature core is laminated to minimise the
___.
A. Cost
B. Weight
C. Hysteresis loss
D. Eddy current loss.
10.
Marks:3
The current in the armature of a DC shunt
generator
can
be
determined
by
the
formula___________.
A. (𝑉 − 𝐸)/Ra
B. E/Ra
C. IL+Ish
D. IL-Ish
11.
Marks:3
Brush shifting is done in a DC generator to ______.
A. Neutralize the cross-magnetizing effect
B. Neutralize the demagnetizing effect
C. Alter the main field flux
D. Alter the inter-pole flux
12.
Marks:3
A 2KW 200 V DC generator will supply a load
current of __________.
A. 2 A
B. 4 A
C. 10 A
D. 20 A
13.
Marks:3
The number of 16A, 250V 3-pin sockets permitted
in a power circuit as per NE code is _________.
A. 1
B. 2
C. 3
D. 4
14.
Channel wiring material is made of
Marks:3
A. Rubber
B. Metal
C. Paper
D. PVC
15.
Marks:3
The direction of rotation of a motor is determined
by …………
A. Fleming’s right hand rule
B. Fleming’s left hand rule
C. Ampere’s right hand grip rule
D. Maxwell’s corkscrew rule.
16.
Marks:3
A DC shunt motor is running on no-load. What will
happen if the field winding gets opened?
A. The motor will stop
B. The motor will burn out
C. The motor will run at high speed
D. The motor will make noise.
17.
The speed of a DC motor is ………..
Marks:3
A. directly proportional to the back emf and
inversely proportional to the flux
B. inversely proportional to the back emf and
directly proportional to the flux
C. directly proportional to the back emf as well as
to the flux
D. inversely proportional to the back emf as well as
to the flux.
18.
Marks:3
The speed of a DC series motor at no load is …….
A. zero
B. 3000 r.p.m
C. 3600 r.p.m
D. infinite.
19.
Marks:3
The most suitable DC motor for the shearing
machines, punches, presses, elevators, conveyors
and rolling mills is the ……….
A. series motor
B. shunt motor
C. cumulatively compounded motor
D. differentially compounded motor
20.
Marks:3
The full current of a 10 HP 250V DC motor
will be closer to …………
A. 100A
B. 60A
C. 30A
D. 10A.
21.
Marks:3
When a 440/220V transformer is connected to
a DC supply………..
A. the output will be 220V
B. the output will be 0V
C. the output will be less than 55V
D. the transformer may be burn.
22.
Marks:3
The no load current of a transformer in terms
of the load current is usually ………..
A. 1 to 3%
B. 5 to 9%
C. 9 to 12%
D. 12 to 20%.
23.
Marks:3
The efficiency of the transformer is generally
………..
A. 25%
C. 75%
B. 50%
D. 97%.
24.
Marks:3
The all-day efficiency of a transformer is the
ratio of the ………..
A. KWH output and the KWH input during day
time
B. KWH output and the KWH input in a day
C. output power and the input power
D. input power and the output power.
25.
Marks:3
Autotransformers are used ………
A. to make small changes in voltage
B. in automobiles
C. to provide automatic voltage changes
D. to maintain constant voltage at the output.
26.
Marks:3
In Scott connections the teuser transformer has
tapping on
A. 86% of primary
B. 58% of primary
C. 58% of secondary
D. 50% of secondary.
27.
Marks:3
Copper loss in a transformer is that power loss
caused by ………
A. eddy current B. magnetic field reversal
C. resistance
D. counter EMF.
28.
Marks:3
Hysteresis loss in a transformer is reduced by
using the proper ………
A. number of coils
B. load
C. materials in the core D. lamination thickness.
29.
Marks:3
The function of conservator in a transformer is
…..
A. to prevent flow of moisture into the tank
B. to prevent flow of air into the tank
C. to take care of expansion and contract of coil
D. to improve power factor.
30.
Marks:3
The tap changer is used on a transformer for
…..
A. adjustments in primary voltage
B. adjustments in secondary voltage
C. adjustments in both primary and secondary
voltages
D. adjustments of power factor.
31.
Bucholtz relay is used on …..
Marks:3
A. Air cooled transformer
B. oil cooled transformer
C. welding transformer
D. furnace transformer.
32.
Marks:3
Potential transformers are used ………
A. with instruments and realys
B. to make small changes in voltage
C. to transfer large amounts of power
D. to increases the potential of supply.
33.
Marks:3
The current transformer steps …….
A. Voltage
C. Power
B. Current
D. Energy.
41.
Marks:3
The KWH meter can be classified as a/an
…………. Instrument
A. deflecting
B. digital
C. recording
D. integrating.
42.
Marks:3
A tong tester is an instrument having a ………….
A. current transformer
B. potential transformer
C. current transformer with an ammeter
D. miniature transformer.
43.
Wattmeter consists of ……..
A. only a voltmeter
B. only an ammeter
C. An ammeter and voltmeter
D. an ammeter, a voltmeter and a power factor
meter.
34.
44.
A. deflecting force
A. carbon
C. copper wire
Marks:3
The force producing movement of the pointer in an
indicating instrument is called a ……..
C. damping force
B. Controlling force
D. distracting force.
35.
Marks:3
A moving coil instrument works on ………..
A. chemical effect
B. heating effect
C. electrostatic effect
D. electromagnetic
effect.
36.
Marks:3
Which of the following methods of damping is
commonly for the measurement of …………
A. Air damping
B.
Eddy
current
damping
C. Fluid damping
D. Viscosity damping.
37.
Marks:3
Dynamometer type meters are used to measure
……
A. only AC quantity
B. only DC quantity
C. both AC and DC
D. pulsating AC .
38.
Marks:3
Before using an ohmmeter, you must ………..
A. select the range
C. connect the resister
39.
B. Short the leads
D. set the zero.
Marks:3
The meter used for multiplier is ……..
A. Copper
C. Manganin
40.
B. Nichrome
D. Ureka
Marks:3
One B.O.T. unit is equal to …………..
A. 750 Watt-hour
C. 1500 Watt-hour
B. 1000 Watt-hour
C. 1200 Watt-hour.
Marks:3
Marks:3
Variable resistors are generally made of …….
B. resistance wire
D. A to B above.
45.
Marks:3
One pica farad is equal to …….
A. 10-2 farad
C. 10-9 farad
B. 10-6 farad
D. 10-12 farad.
46.
Marks:3
A transistor has …….
A. one PN junction
C. three PN junction
B. two PN junction
D. four PN junction.
47.
Marks:3
The current gain of a common base amplifier is
expressed by ……….. the symbol.
A.alpha(α)
B. beta(β)
C. theta(θ)
D. gama(Ƴ).
48.
Marks:3
The oscillator which produces sinusoidal
output is known as ………..
A. harmonic oscillator B. relaxation oscillator
C. feedback oscillator D. damped oscillator.
49.
Marks:3
An SCR is a ………..
A. transistor
B. semi-conductor device
C. alternator D. heating regulating device.
50.
Marks:3
Diac can be used to trigger the following
devices ………..
A. SCR/UJT
C. Triac/SCR
B. UJT/Triac
D. Transistor.