UPPCL-JE’21 EE: Daily Practices Quiz 02-Nov-2021

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UPPCL-JE’21 EE: Daily Practices Quiz

UPPCL-JE’21 EE: Daily Practices Quiz 02-Nov-2021

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

Q1. A single input gate in which input and output are same is called ………
(a) buffer
(b) EX-NOR
(c) AND
(d) inverter

Q2. Normally, overhauling is performed at an interval of ………
(a) 1 week
(b) 6 months
(c) 1 month
(d) 5 years

Q3. In two wattmeter method of power measurement method, the power factor is given as:
(a) sin⁡{tan^(–1)⁡(±√3 (W1 – W2)/(W1 + W2 )) }
(b) cos⁡{tan^(–1)⁡(±√3 (W1+ W2)/(W1 – W2 )) }
(c) sin⁡{tan^(–1)⁡(±√3 (W1+ W2)/(W1 – W2 )) }
(d) cos⁡{tan^(–1)⁡(±√3 (W1– W2)/(W1+ W2 )) }

Q4. The minimum number of wattmeter(s) required to measure 3-phase. 3-wire balanced or unbalanced power is:
(a) 4
(b) 1
(c) 2
(d) 3

Q5. For increasing the range of voltmeter, connect a
(a) Low value resistance in series with voltmeter
(b) High value resistance in parallel with voltmeter
(c) High value resistance in series with voltmeter
(d) Low value resistance in parallel with voltmeter

Q6. If the conductor radius increases, inductance of the line-
(a) increases
(b) decreases
(c) remains same
(d) may increase or decrease

SOLUTIONS

S1. Ans.(a)
Sol. Buffer

S2. Ans.(b)
Sol. Overhauling is a part of preventive maintenance. Preventive maintenances are not to be done very frequently, but it is advised, that, the preventive maintenance must be done at least once in the machine’s life. This imitation is caused due to very high costs of operation of preventive maintenance.

S3. Ans.(d)
Sol. power measurement by two wattmeter method –
tanθ = √3 ((W_1-W_2)/(W_1+W_2 ))
So, power factor =cosθ=cos⁡{tan^(-1)±√3 ((W_1-W_2)/(W_1+W_2 ))}
And two wattmeter methods used for-
I. balanced and unbalanced load
II. star and delta connected load.

S4. Ans.(c)
Sol. for n-wire system, minimum number of wattmeter’s required = (n-1)

S5. Ans.(c)
Sol. Voltmeter range increment: – High value resistance in series with it
I.e.,(Rs=Rm (m-1) )
R_m = meter resistance
m=V/Vm≃I/Im

S6. Ans.(b)
Sol. Inductance of a line.
L = 2×10-7 ln[GMD/GMR] H/m/phase
and. GMR α Radius of the conductor
If radius increases then GMR will increase and inductance will decrease.