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31st August 2015, 02:31 PM
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Join Date: May 2012
Re: DMRC Electrical Question Papers

Ok, as you want the question paper of Electrical engineering of Delhi Metro Rail Corporation DMRC Junior Engineer exam so here I am providing you.

DMRC Junior Engineer Electrical exam question paper

1. Mho relay is usually employed for the protection of
a) Short lines only
b) Medium lines only
c) Long lines only d) Any line

Ans: Long lines only

2. A modern power semiconductor device IGBT is combines the characteristics of
a) BJT and MOSFET
b) FCT and GTO
c) SCR and MOSFET
d) SCR and BJT

Ans: BJT and MOSFET

3. For a single-phase a.c. to d.c. controlled rectifier to operate in regenerative mode, which of the following conditions should be satisfied?
a) Half –controlled bridge, α 90°, source of e.m.f. in load
c) Full-controlled bridge, α > 90°, source of e.m.f. in load
d) Full-controlled bridge, α 90°, source of e.m.f. in load

4. Which is the most suitable power device for high frequency ( more 100 kHz) switching application?
a) Power MOSFET
b) BJT
c) SCR
d) UJT
Ans: Power MOSFET

5. In a thyristor Latching current is ________ than Holding current a) Equal
b) Less
c) Greater
d) None


DMRC Junior Engineer Electrical exam question paper








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