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PSPCL-JE’21 EE: Daily Practices Quiz 29-Sep-2021

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 29-Sep-2021

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

Q1. A current transformer must all times have
(a) A short circuited secondary
(b) A secondary load
(c) Either a or b
(d) None of the above

Q2. Piezo electric transducers are
(a) Active transducer
(b) Passive transducer
(c) Primary transducer
(d) Secondary transducer

Q3. Piezoelectric transducer is used for measuring __________
(a) Non-electrical quantities
(b) Electrical quantities
(c) Chemical quantities
(d) Any quantity

Q4. An induction motor has a rotor resistance of 0.002Ω/phase. If the resistance increased to 0.004Ω/phase, then the maximum torque will
(a) Reduced to half
(b) increased by 100%
(c) Increased by 200%
(d) Remain unaltered

Q5. Cogging of induction motor occurs at
(a) High voltage and when stator and rotor poles are equal
(b) Low voltage and when stator and rotor poles are equal
(c) High voltage and when stator and rotor poles are not equal
(d) Low voltage and when stator and rotor poles are not equal

Q6. In star connected system the phase angle difference between line and phase voltage is:
(a) 30°
(b) 120°
(c) 60°
(d) 90°

SOLUTIONS

S1. Ans.(c)
Sol. C.T must never operate with secondary winding open but P.T can be operated with secondary winding open.

S2. Ans.(a)
Sol. A transducer utilizing piezoelectric element to convert mechanical motion into electrical signal is called a piezoelectric transducer. This transducer works on the principle of Piezoelectric Effect. It is an active transducer.

S3. Ans.(a)
Sol. A piezoelectric transducer is used for measuring non-electrical quantities such as vibration, acceleration, pressure and the intensity of sound.

S4. Ans.(d)
Sol. Maximum torque in an induction motor, T_MAX ∝1/2X.
the maximum torque is independent of rotor resistance and is inversely proportional to rotor reactance. So, if we increase the rotor resistance the maximum torque will be unaltered.

S5. Ans.(b)
Sol. Starting Torque ∝ V². When the supply voltage is low, the starting torque is low and when the poles on stator and rotor are equal, due to locking tendency motor caused by the slot harmonics reduced/failed to start.

PSPCL RECRUITMENT 2021, PSPCL-JE ELECTRICAL. PSPCL-JE QUIZ |_30.1

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