UPRVUNL'21 EE: Daily Practices Quiz 23-July-2021 |_00.1
Engineering Jobs   »   uprvunl je electrical quiz

UPRVUNL’21 EE: Daily Practices Quiz 23-July-2021

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

Q1. The rotor input when rotor copper loss in an induction motor is 600 W and slip 3 % is:
(a) 18 kW
(b) 20 kW
(c) 25 kW
(d) 200 kW

Q2. The mutual inductance between two coils having self -inductances 3 H and 12 H and coupling coefficient is 0.85:
(a) 1.7 H
(b) 5.1 H
(c) 12.75 H
(d) 0.425 H

Q3. In a 3-phase induction motor, the mechanical power developed, in terms of air gap power P_g is:
(a) sP_g
(b) P_g/s
(c) (1-s) P_g
(d) P_g/(1-s)

Q4. In the given circuit, if the power consumed by 5Ω resistor is 10 watts, then power factor of the circuit is

UPRVUNL'21 EE: Daily Practices Quiz 23-July-2021 |_40.1

(a) 0.8
(b) 0.6
(c) 0.5
(d) zero

Q5. In residential wiring in practice for earthing the following method is adopted……
(a) Resistance earthing
(b) Neutral earthing
(c) Pipe earthing
(d) Plate earthing

Q6. For which of the following is magnetic susceptibility negative?
(a) Paramagnetic and Ferromagnetic materials
(b) Paramagnetic Materials only
(c) Ferromagnetic Materials only
(d) Diamagnetic Materials

SOLUTIONS

S1. Ans.(b)
Sol. Pcu = Rotor copper loss = sP_g
Where; P_g=air-gap power or rotor input power
∴ 600=0.03×P_g
∴P_g=600/0.03=20000 W=20 kW

S2. Ans.(b)
Sol. M=k√(L_1 L_2 )=0.85×√(3×12)=0.85×6=5.1 H

UPRVUNL'21 EE: Daily Practices Quiz 23-July-2021 |_50.1

S5. Ans.(d)
Sol. In residential wiring in practice for earthing, plate earthing is adopted.
• In Plate Earthing an earthing plate either of copper of dimension 60cm×60cm×3m of galvanized iron of dimensions 60 cm× 60 cm×6 mm is buried into the ground with its face vertical at a depth of not less than 3 meters from ground level.

S6. Ans.(d)
Sol. Diamagnetic material: Magnetic materials which align against the magnetic field are known as diamagnetic materials. Magnetic susceptibility is χ<0 which means it is always a negative value for diamagnetic material.
These materials are independent of temperature. As these materials magnetize in the opposite direction, they do have a small amount of magnetization intensity. Gold, tin, mercury, water, etc are examples of diamagnetic materials.
For a diamagnetic material, the relative permeability lies between 0 ≤ μr < 1 and its susceptibility lies between −1< χ< 0. 𝑥=𝑢𝑟−1
Where 𝑥 is a dimensionless quantity defines as the magnetic susceptibility of the medium.

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?