Rrb alp-question-paper-1

1. HELD ON
03.01.2010

LA de series motor should not be
‘started: p
0) Atnoload. (2) Atfullload
(6) With normal oad
(a) With a smal load

2. The alr gap between stator and
armature o an electr motor la
Kept as small as posstble
Li To et a stronger magnetic

(2) To lmprove the alr circulation.
(9) Toreach a higher speedafro-
tacon

(9 To make the rotation casier

‘A polythene piece rubbed with
‘wool ound to have a negative
charge of8.2« 177 coulomb. Es-
mate the number of electrons
transferred.
(2x10 (2x 10%
(13x10 (4) 3x 10"

4. Coulombe law le given by F =
er

Y
m3 CE

ast al

fa positive charge fsshited fom
‘low potential region to high po
{ental region the electri poten-
al energy
(A) Decreases (2) Increases,
(9) Remains the same
(4) May increase decrease

6: When a dielectric dlb ' intro.
duced between the plates faca-
pacitor connected toa battery.
(0) Charge on capacitor increases
(2) Potential diference across the

‘capacitor increases

(9 capacity remains same
(4) None ofthese

7. The value of the current in the
tel shown in the flowing 66-

we

1A Moala
90004 WOIA
8. Specie resistance of copper. sl
ver and constantan are 1.78 x
10 Qem, 1090 cm and 48 |
10-80 cm respectively. Which is.
the best conductor?
(0) Copper
の Ser
(3 Constatan
(4) Copper ana Silver
19.4 piece of copper and another of
{germanium are cooled from room
temperature to 40K: The
resistance of:
(0) Each of them decreases
(2) Each of them increases
(Gi Copper mereases, germanium
decreases
(Copper decreases, germanıum |
tnereases
10. How much euren is da by
a motor of 0.8 HP rom 220 vot
00000?
Q12A “aaa
(917A (None ofthese
11. The commercial un of electric
energy ls a Kilowat-hour fkwhl
evi equal to
(UNO: 10° @) 38% 109
PEA
12. In an electric ton the wire of
chrome 15 used because
{0 tea high meting point and
‘igh val of apio resi.
tance

(2) 1: am be easily dawn mto
wires
(9) Tes hot aise easily when.
heated in ar
{47 Al the above
19. Acurtent in acireuthaving con
stant reslstancé is tripled. How
does this allect the power dll.

pation?
(tet à tates
(2) it becomes 5 times

(E) becomes 10 times
TA) At becomes Y times ㅣ

RRB CHANDIGARH ASSTT. LOCO PILOT EXAN

14. Special silicon steel 5
laminations in power a
toreduce
(0) Eddy current losses
(2) Hysteresis losses
(8) Copper losses
(a Bôth (and (2)

18. An inductor may store en
(Ne electric fe
(2) ts cols
(8) ts magnetic ets
(41 Both in magnetic an
eld

16. The working ofa dynamo
on the principle of
(M eating effect of eure
{2) Magneti effet of eur
18) Chemical effect of
(@) Electromagnetic in

17. Iman a.c.cireut (he cur
(0) 1 tn phase with th
leads the voltage
(8) Lago the voltage
(@) Any of the above

18. Which ofthe following 0:
remains constant 1 as
transformer?

(G) Current

(2) Voltago

(8) Power

(A) None ofthese

19, Super high frequency el
nelle waves are used
“cir frequency range に |
(1) 2000 to 20000 M:
(2) 2000 to 20000 iz
(8) 30000 to 60000 MHz
(a) None of these

20. When an impurity i op
an Intrinsic semloonducı
conduct ofthe se
(N Déérenses
(2) Beco zero
(3) Reshans dame
(a) nites

2. In he following Nie. tn
ls 808 the tenninals À
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