PSPCL-JE’21 EE: Daily Practices Quiz 25-Oct-2021

Table of Contents

PSPCL RECRUITMENT 2021

Punjab State Power Corporation Ltd. (PSPCL), a power generating and distributing company of the Government of Punjab state, has released the notification for recruitment to the post of Clerk, Revenue Accountant, Junior Engineer (Electrical), Assistant Lineman & Assistant Sub Station Attendant Posts.
A total of 75 vacancies have been announced for the recruitment process of JE ELECTRICAL Engineering.

Exam Dates: 10 N0V-21 to 17 Nov-21

PSPCL-JE’21 EE: Daily Quiz

PSPCL-JE’21 EE: Daily Practices Quiz 25-Oct-2021

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

Q1. Total core loss of a transformer is also referred as
(a) Eddy current loss
(b) Hysteresis loss
(c) Copper loss
(d) Magnetic loss

Q2. The magnetic flux density and the vector magnetic potential A are related as
(a) B ⃗ = ∇ . A ⃗
(b) A ⃗ = ∇ × B ⃗
(c) B ⃗ = ∇ × A ⃗
(d) A ⃗ = ∇ . B ⃗

Q3. When a line-to-ground fault occurs, the current in the faulted phase is 100 A. The
zero-sequence current this case is
(a) 33.3 A
(b) zero
(c) 66.6 A
(d) 100 A

Q4. Direct lighting method of illumination is used in
(a) Houses
(b) Industries
(c) Outdoor lightning
(d) All of the above

Q5. In the indirect method of lighting about how much percentage of light falls on the surface?
(a) 10 %
(b) 50 %
(c) 75 %
(d) 90 %

Q6. Lumen/ watt is the unit of
(a) Light flux
(b) Luminous intensity
(c) Brightness
(d) Luminous efficiency

SOLUTIONS

S1. Ans.(d)
Sol. Core loss consists of eddy current loss and hysteresis loss.
i.e., core loss= eddy current loss+ hysteresis loss.
Core loss is mainly due to magnetic properties. So, core loss is also called magnetic loss.
Copper loss: heat generated due to resistance of winding.

S2. Ans.(c)
Sol. B = Curl(A).
I.e., B ⃗ = ∇ × A ⃗

S3. Ans.(a)
Sol. Zero sequence current = 1/3(100) = 33.3 A

S4. Ans.(d)
Sol. In direct lighting method of lighting, an opaque reflector directs 90 % of the light vertically downwards. Only 10 % of light will be absorbed in this system by the reflector. It is uses in houses, industries and general outdoor lighting.

S5. Ans.(a)
Sol. indirect lighting method of lighting, 90 % of the light is reflected upwards and only 10 % falls on the surface. They are used for mainly decoration purposes in cinemas, hotels, club etc.

S6. Ans.(d)
Sol. Luminous efficiency is the ratio of the total luminous flux radiated by any source to the total radiant flux from the source commonly expressed in lumens per watt.