RRB JOBS QUESTION BANK : JUNIOR ENGINEER (AC)

QUESTION BANK FOR SELECTION TO THE POST OF JUNIOR ENGINEER (AC)

 

SELECT THE CORRECT ANSWER:

 

1)      Size of V belts used for 25KW Alternator                                                    (    c      )

a.       C121                                            c.        C122

b.       C123                                            d.        C124

2)      Capacity of battery fuse in AC Coaches                                                      (    a      )

a.       315 A & 400 (HRC )                     c.        16 A (HRC )

b.       63 A (HRC )                                  d.        5 A (HRC )

3)      The gap between the two halves of axle pulley should be                         (     c     )

a        0.5 – 1.0 mm                               c.        3.0 – 4.0 mm

b.       2.0 – 3.0 mm                               d.        5.0 – 5.5 mm

4)      What are the AH capacity of cells used in all types of AC coaches           (      b      )

a.       800 Ah Lead Acid & 1100 Ah VRLA

b.       800 & 1100 Ah Lead Acid & 1100 Ah VRLA

c.        1100 Ah    

d.        800 Ah

5)      Name the Acid used in lead acid cells                                                        (     a     )

a.       Sulphuric Acid                             c.        Nitric acid

b.       Hydrochloric Acid                        d.        Phosphoric Acid

6)      The Specific gravity & Voltage of fully charged cells are                          (      a     )

a.       1220 & 2.2                                   a.        1200 & 2.2

b.  1220 & 2.1                                        b.          1200 & 2.1

7)      Cut in speed for brushless alternator in AC application                             (     b     )

a.       21                                                c.        19

b.       20                                                d.        18

8)      Inverter converts                                                                                        (      a     )

a.       DC to AC                                      c.        AC to AC

b.       DC to DC                                      d.        AC to DC

9)       IGBT are used as                                                                                        (     a     )

          a.       High frequency switching device   c.        Low frequency switching device

            b.       Illuminating device                         d.        Amplifier

10)     Boost charge of VRLA cells is                                                                     (      a     )

a.       2.3 V/Cell                                    c.        2.25 V/Cell

b.       110 V/Cell                                   d.        115 V/Cell

11)     Trickle charging of VRLA cells is                                                                 (     c     )

a.       2.3 V/Cell                                    c.        2.25 V/Cell

b.      110 V/Cell                                    d.          115 V/Cell

12)     Rectifier converts                                                                                        (     b     )

a.       DC to AC                                      c.        AC to AC

b.       AC to DC                                      d.        DC to DC

13)    Give the half load setting of RRU for AC application at 1500 rpm             (   a      )

a.       97 Amps                                      c.        21 Amps

b.      20 Amps                                      d.         22 Amps

14)    Required level of Illumination in corridor of 2-Tier AC coach is                (     c     )

a.      14 Lux                                         c.          40 Lux

b.      22 Lux                                         d.          16 Lux

15)    Give the minimum tension length of spring used in Tension rod of 25 KW Alternator

a. 310 mm                                       c.        269 mm

b  265 mm                                      d.         275 mm

16)    Why lead acid cells are called as secondary cells                                       (    c     )

a.       Since it can’t be recharge           c.        Since it can be recharged

b.       Since it can’t charge initially      d.        None

17)    Name the method to be used to find out Earth leakage                             (     a    )

a.       Double test lamp method           c.        Tong tester method

b.       Multi meter method                   d.        Volt meter method

18)    If alternator is not generating voltage, the reason could be                      (     d     )

a.       Field may be open                       c.        Dropping of V-belts

b.       Fuse in regulator had blown        d.        All the above

19)    The advantage of ERRU is                                                                           (     d     )

a.       To obtain pure DC supply            c.        Produces over voltage

b.        Inbuilt  Over  Voltage protection d.        Both (a) & (b)

20)    The capacity of Regulators used in AC coaches are                                    (     a    )

a.       18KW & 25KW                             c.        4.5KW & 25KW

               b.         4.5KW & 15KW                          d.         4.5KW & 18KW

 

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