UPPCL-JE’21 EE: Daily Practices Quiz 15-Nov-2021

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UPPCL-JE’21 EE: Daily Practices Quiz

UPPCL-JE’21 EE: Daily Practices Quiz 15-Nov-2021

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

Q1. Breather is provided in a transformer to
(a) Absorb moisture of air during breathing
(b) provide cold air in the transformer
(c) The filter of transformer oil
(d) None of above

Q2. Choose the characteristics which are not related to an ideal OP-AMP.
(a) Very high gain
(b) Very high input impedance
(c) Very low CMRR
(d) Very low output impedance

Q3. Input and output impedance of ideal OP-AMP will be?
(a) Zero, Zero
(b) Zero, Infinite
(c) Infinite, Infinite
(d) Infinite, Zero

Q4. The qualities aspired to obtain a good permanent magnet is/are
(a) High coercivity
(b) High residual flux
(c) Low coercivity
(d) High residual flux and high coercivity

Q5. The pitch factor, in rotating electrical machinery, is defined as the ratio of resultant EMF of a
(a) Full pitch coil to the phase emf
(b) Chorded coil to that of full pitched coil
(c) Full pitched coil to that of a chorded coil
(d) Chorded coil to the phase emf

Q6. What is the maximum load that can be connected in a circuit containing only lighting points?
(a) 500 watts
(b) 750 watts
(c) 800 watts
(d) 1000 watts

SOLUTIONS

S1. Ans.(a)
Sol. The breather transports fresh air in and out of the transformer. Breather mainly consists of a silica gel. The silica gel absorbs the moisture content of air so that oil contamination can be prevented.
NOTE:
breather is provided on the top of the conservator.
The silica gel which is blue in colour turns pink when it absorbs moisture fully.

S2. Ans.(c)
Sol. An ideal op-amp has infinite CMRR and zero output resistance. Apart from CMRR, all the mentioned are characteristics of an op-amp.

S3. Ans.(d)
Sol. Characteristics of an ideal op-amp:
Infinite open loop voltage
Infinite input resistance
Zero output resistance
Infinite bandwidth
Infinite common-mote rejection ratio (CMRR)

S4. Ans.(d)
Sol. Both high residual flux as well as coercivity is desired for a good permanent magnet.

S5. Ans.(b)
Sol. K_p= Resultant EMF of a chorded coil/Resultant EMF of a full pitched coil = cos⁡(ε/2)
Or, K_p=(phasor sum of coil side emf)/(arithmetic sum of coil side ef)=(2Ecos⁡(ε/2))/2E=cos⁡(ε/2)

S6. Ans.(c)
Sol. The maximum load that can be connected in a circuit containing only lighting points is 800 watts.

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