Transcript
Special Free Session – 3 PM
SUBJECT – Control system
SSC JE – 5 PM (Under SSC Subscription)
SUBJECT – BEE (Basic Electrical Engineering)
UPPSC AE – 7 PM (Under UPPSC subscription)
SUBJECT – Control System
SSC JE – 9 PM
Crash course of SSC JE with MCQs
ashishsoniwifistudy
1. The energy stored in the magnetic field of a
solenoid 10 cm long and 2 cm diameter, with 1000
turns of carrying current of 10A is [UPSSC 2015]
a) 1.15J
b) 0.015J
c) 0.19J
d) 0.5J
2. A bar of Iron 1 cm² in cross section has 10−4 Wb of
Magnetic Flux in it, If μr = 2000 . What is the
Magnetic field intensity in the bar? [S.S.C.J.E. 2015]
a) 398 × 104AT
m
b) 𝟑𝟗𝟖𝐀𝐓
𝐦
c) 398 × 10−4AT
m
d) 796 × 10³AT
m
3. The magnitude of AT required to establish a given
value of Flux in the air gap will be much greater
than that required for Iron part of a magnetic circuit,
because: [S.S.C.J.E. 2015]
a) air has the lowest relative permeability
b) iron has the lowest permeability
c) air is a gas
d) air is a good conductors of magnetic flux
4. A conductor is rotated in a magnetic field. the
direction of the induced emf can be found by
application of A conductor is rotated in a magnetic
field. The direction of the induced emf can be found
by application of– [UPRVUNL 2014]
a) Faraday Law
b) Lena’s Law
c) Fleming’s right hand rule
d) Flemings left hand rule
5. A straight conductor of 100 cm in length, moves
with a uniform velocity of 2 m/s at right angles to
itself and to a uniform magnetic field of Flux density
1 Wb/m². the value of induced e.m.f between the
ends of the conductor is [SBNL TTA JE 2015]
a) 200 V
b) 0 V
c) 1 V
d) 2 V
6. The magnetic Flux density in an air-cooled coils is10−2 wb/m². With cast iron relative permeability 100
inserted, the Flux density will become [BSNL TTA
2016]a) 10−4 Wb/m²
b) 10+4 Wb/m²
c) 10−2 Wb/m²
d) 𝟏 wb/m²
7. Magnetostriction is a phenomenon of: [FCI 2015]
a) Generation of electricity in ferromagnetic
materials
b) Generation of magnetism in ferromagnetic
materials
c) Change in permeability of ferromagnetic
materials during magnetization
d) Change in physical dimension of ferromagnetic
materials during magnetization
8. Which of the following statement is correct? [ESIC
JE Electrical 2016]
a) The magnetic Flux inside an exciting coil is lower
than its outside surface
b) The magnetic Flux inside an exciting coil is zero
c) The magnetic Flux inside an exciting coil is
greater than its outside surface
d) The magnetic Flux inside an exciting coil is same
as on its outside surface
9. A coil having 90 turns is connected to a 120 V, 60
Hz source. If the effective value of the magnetizing
current is 4 A, then calculate the value of
inductance of the coil. [Jammu & Kashmir JE
electrical 2016]
a) 79.6 mH
b) 121.2 mH
c) 32.2 mH
d) 83.16 mH
10. According to Biot–Savart’s laws the magnetic
field at a point due to incremental element of length
dl carrying a current is. [Jammu & Kashmir JE
Elctrical]
a) Inversely proportional to the current carried by
the element
b) Directly proportional to the current carried by the
element
c) Directly proportional to the square of the
distance
d) Inversely proportional to the length of the
element
11. In Fleming’s right hand rule the middle finger
indicates the direction of: [LMRC JE Electrical 2016]
a) force on a current carrying conductor
b) dynamically induced emf in a conductor
c) magnetic field
d) motion given to the conductor
12. Which of the following does not pertain to theequation 𝛻. B = 0? [Coal India Ltd. Electrical 2017]
a) Single magnetic pole cannot exist
b) There are no sinks and sources for magnetic field
c) Magnetic field is perpendicular to the electric
field
d) Magnetic field is solenoidal
13. The electric and magnetic fields are: [Coal India
Ltd. Electrical 2017]
a) two distinctly separate and isolated phenomena
b) two parts of one unique phenomena
c) two conflicting phenomena, one suppressing the
other
d) two sequential phenomena, with a retardation
effect between the two fields
14. The dielectric strength of rubber is 30000 V/mm
at frequency of 50 Hz. What is the thickness of
insulation required on an electrical conductor at 33
kV to sustain the breakdown? [UPPCL AE Electrical]
a) 0.825 cm
b) 0.8 mm
c) 1.0 cm
d) 1.1 mm
15. A cast steel electromagnet has an air gap
length of 0.3 cm. Find the ampere–turns for the air
gap to produce a Flux density of 0.7 Wb/m² in the
air gap. [SSC JE Electrical 2017]
a) 2100 AT
b) 1671 AT
c) 1447 AT
d) 167 AT
16. When the total charge in a capacitor is doubled,
the energy stored [APSPDCL-14]
a) remains the same
b) is halved
c) is doubled
d) is quadrupled
17. The electric field intensity due to an infinite
plane sheet of charge is [UPRVUNAL AE Electrical
2014]
a) Inversely proportional to the perpendicular
distance of the field point P from the plane sheet
b) Directly proportional to the perpendicular
distance of the field point P from the plane sheet
c) Independent of the location of the field point P
d) None of the other options
18. Capacitance of a capacitor [BSNL TTA 2016]
a) Increases with increases in overlapping Area of
plates
b) Increases with increases in relative permittivity of
the dielectric
c) Increases with decreases in distance between
the plates
d) All of these
19. An air-filled parallel plate capacitor made of
square plates, each 10cm×10cm, has a
capacitance C. If the plates are reduced to 2.5
cm×2.5cm, what would be the new capacitance?
[BSNL TTA JE 2013]
a) C/4
b) C/8
c) C/16
d) C/32
20. In a parallel plate capacitor, a dielectric slab is
introduced, the potential difference between plates
will? [SSC JE Electrical 2017]
a) decrease
b) remain the same
c) increase
d) becomes zero
21. When a dielectric is placed in an electric field,
the field strength......... . [SSC JE Electrical 2017]
a) Increases
b) Decreases
c) Remain unchanged
d) Reduces to zero
UPPSC AE - 2020
SSC JE-2019
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(28) In a steam power plant…………heats the feed water on its way to the boiler by
delivering heat from the flue gases: -
(A) Superheater (B) Economizer
(B) Preheater (D) Turbine
(29) Power generation of thermal power plants is based on: -
(A) Rankine cycle
(B) Otto cycle
(C) Diesel cycle
(D) Carnot cycle
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