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Which is correct, in the given below power triangle with respect to the power vectors if vector b is active power?

2.Which is correct, in the given below power triangle with respect to the power vectors if vector b is active power?

(a) a: kVAr b: kVA c: kW

(b) a: kW b: kVA c:kVAr

(c) a: kVAr b: kW c: kVA

(d) a: kVA b: kW c:kVAr

Ans:c


3.What is the preferred OLR setting range for a 22.5 kw , 415V , 3 Phase SCIM motor , Y/D starter , against over loads in amperes ?
a. 9 – 15
b. 20 – 33
c. 14 – 23
d. 30 – 50
Ans: b
Given data :-
Power =22.5KWor22.5\times10^3W
Voltage = 415 V
Required data :-
OLR Current setting = ?
Solution:-

P=\surd3V_L\times I_L\times cos\theta
Power factor is not given in this question  so we can assume 1 or unity
P=\surd3V_L\times I_L\times cos\theta

\begin{array}{l}\rightarrow\;22.5\times10^3=\surd3\times415\times I_l\times1\\\end{array}

\begin{array}{l}\rightarrow I_l=\frac{22.5\times10^3}{\sqrt3\;\times415}\\\end{array}

  = 31.30A [ Full load current ]

We know that each thermal over load relay current should be set is 80% full load current of the motor .

→ OLR current =(80/100)×31.30

            = 25.04A

 

 

SDSC Technician- B ( Electrical) 2018 solution paper

Solution Paper

Government of India  department of space

           

Indian Space Research Organisation 

                        

SDSC Technician- B ( Electrical) 2018 solution paper

               

 Satish Dhawan Space Centre Shar , Sriharikota [ April 29,2018]

 

 Instruction to the candidates

1.The question paper each in the form of test booklet all candidate will be assessed on identical
question

2. A separate OMR answer sheet with carbon impression copy is provided to all the candidates
for answering . After completion of the test the carbon Impressions of the OMR sheet will be
detached and handed over to candidate by the invigilator which should be carefully retained by
the candidate for all features reference.

    Solution finding for click below link

  • 1 to 10 questions for click link  ⇒    [solution]
  • 11 to 20 questions for click link ⇒    [solution]
  • 21 to 30 questions for click link ⇒   [solution]
  • 31 to 40 questions for click link ⇒   [solution]
  • 41 to 42 questions for click link  ⇒  [solution]

 

 

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