DFCCIL 2021. DFCCIL ELECTRICAL QUIZ |_00.1
Engineering Jobs   »   Electrical Engineering quizs   »   DFCCIL 2021. DFCCIL ELECTRICAL QUIZ

DFCCIL’21 EE: Daily Practice Quiz. 08-September-2021

DFCCIL Recruitment 2021 –Dedicated Freight Corridor Corporation of India Limited (DFCCIL) Public Sector Undertaking under the administrative control of the Government of India (Ministry of Railways).DFCCIL has released the official notification for the recruitment of 1074 vacancies for the recruitment of Junior Executives, Executives, and Junior Managers through their official website, i.e. dfccil.com.

               DFCCIL’21 EE: Daily Practices Quiz 08-Sep-2021

Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 08 min.

Q1. Which element is the best conductor of electricity?
(a) Silver
(b) Copper
(c) Aluminium
(d) Iron

Q2. The resistance of a semi-conductor on heating:
(a) Increases
(b) Decreases
(c) Remains constant
(d) None of the above

Q3. For the block diagram given in the following figure, the expansion C/R is:

DFCCIL 2021. DFCCIL ELECTRICAL QUIZ |_40.1

(a) (G1 G2 G3)/(1-G1 G2 )
(b) (G1 G2)/(1-G1 G2 G3 )
(c) (G1 G2 G3)/(1-G1 G2 G3 )
(d) (G1 G2)/(G3 (1-G1 G2 ) )

Q4. What is the use of higher flux density in the transformer design?
(a) For increasing the weight
(b) For decreasing the weight
(c) For reducing iron losses
(d) For improving insulation

Q5. Which of the following is binary equivalent of decimal (0.875)?
(a) 0.0110
(b) 0.1010
(c) 0.1110
(d) 0.1001

Q6. In a step-up chopper circuit, if V_s is the source voltage and α is duty cycle, then the output voltage is
(a) Vs /(1 + α)
(b) Vs (1 + α)
(c) Vs (1 – α)
(d) Vs/(1 – α)

SOLUTIONS
S1. Ans.(a)
Sol. From the above given options silver is the best conductor followed by copper, aluminium and iron.

S2. Ans.(b)
Sol. At higher temperatures, semi-conductor valence electrons are free, hence conduction occurs and resistivity decreases.

DFCCIL 2021. DFCCIL ELECTRICAL QUIZ |_50.1

S4. Ans.(b)
Sol. flux density (B) = ϕ/A
So, flux density is inversely proportional to the cross-sectional Area, so higher flux density means smaller Area i.e., Reduced weight of the transformer.

S5. Ans.(c)
Sol. 0.875 × 2 = 1 + 0.75
0.75 × 2 = 1 + 0.5
0.5 × 2 = 1 + 0
Here is the answer to 0.875 decimal to binary number: 0.111
Happened:0.87510 = 0.11102
Rule to remember:
A) Convert the integral part of decimal to binary equivalent
1. Divide the decimal number by 2 and store remainders in array.
2. Divide the quotient by 2.
3. Repeat step 2 until we get the quotient equal to zero.
4. Equivalent binary number would be reverse of all remainders of step 1.
B) Convert the fractional part of decimal to binary equivalent
1. Multiply the fractional decimal number by 2.
2. Integral part of resultant decimal number will be first digit of fraction binary
number.
3. Repeat step 1 using only fractional part of decimal number and then step 2 until
fractional parts become zero.
C) Combine both integral and fractional part of binary number.
EXAMPLE:
Let’s take an example for n =1.875
Step 1: Conversion of 1 to binary
1. 1/2: Remainder = 1: Quotient = 0
So equivalent binary of integral part of decimal is 1.
Step 2: Conversion of .875 to binary
For converting decimal fraction 0.875 to binary number, follow these steps:
Multiply 0.875 by 2 keeping notice of the resulting integer and fractional part. Continue multiplying by 2 until you get a resulting fractional part equal to zero (we calculate up to ten digits).
Then just write out the integer parts from the results of each multiplication to get equivalent binary number.

1. 0.875 * 2 = 1.75, Integral part: 1, fractional part: 0.75
2. 0.75 * 2 = 1.5, Integral part: 1, fractional part: 0.5
3. .5 * 2 = 1.0, Integral part: 1, fractional part: 0
So equivalent binary of fractional part of decimal is .111
Step 3: Combined the result of step 1 and 2.
Final answer can be written as:
1 + .11 = 1.111

S6. Ans.(d)
Sol. For step-up chopper:  VO=Vs/(1 – α).

DFCCIL 2021. DFCCIL ELECTRICAL QUIZ |_60.1

Sharing is caring!

×

Download success!

Thanks for downloading the guide. For similar guides, free study material, quizzes, videos and job alerts you can download the Adda247 app from play store.

Thank You, Your details have been submitted we will get back to you.

Was this page helpful?

Leave a comment

Your email address will not be published. Required fields are marked *

Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Login

OR

Forgot Password?

Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Sign Up

OR
Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Forgot Password

Enter the email address associated with your account, and we'll email you an OTP to verify it's you.


Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Enter OTP

Please enter the OTP sent to
/6


Did not recive OTP?

Resend in 60s

Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Change Password



Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Almost there

Please enter your phone no. to proceed
+91

Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Enter OTP

Please enter the OTP sent to Edit Number


Did not recive OTP?

Resend 60

By skipping this step you will not recieve any free content avalaible on adda247, also you will miss onto notification and job alerts

Are you sure you want to skip this step?

By skipping this step you will not recieve any free content avalaible on adda247, also you will miss onto notification and job alerts

Are you sure you want to skip this step?