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UPRVUNL’21 EE: Daily Practices Quiz 13-Sep-2021

UPRVUNL JE Recruitment 2021: 

A total of 196 vacancies were released by the UPRVUNL Recruitment 2021. The selection process will be based on the written examination which will be divided into two parts – Part I and Part II. Part I will have 150 objective-type questions from the syllabus for the Diploma Engineering in the relevant branch. While Part II will have 50 objective-type questions comprising General Knowledge, General Hindi, and Reasoning.

UPRVUNL’21 EE:  Daily Practices Quiz 13-Sep-2021

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

Q1. The speed regulation of a synchronous motor is
(a) 100 %
(b) 50 %
(c) 25 %
(d) 0 %

Q2. Two-wattmeter, connected to measure power in a three-phase balanced circuit, read 100 W each, the reactive power absorbed by the circuit is
(a) 300 Var
(b) 200 Var
(c) 100 Var
(d) 0 Var

Q3. 0-10 mA PMMC ammeter reads 4 mA in a circuit. Its bottom control spring snaps suddenly. The meter will now read nearly…
(a) 10 mA
(b) 8 mA
(c) 2 mA
(d) Zero

Q4. Which power plant has the minimum running cost?
(a) Coal-based
(b) Hydel
(c) Nuclear
(d) None of these

Q5. A smaller air gap in induction motor helps to
(a) Reduce the chance of cogging
(b) Reduce the magnetizing current
(c) Reduce the chance of crawling
(d) Increase the starting torque

Q6. A full-pitched coil in a 6-pole machine has a mechanical span of
(a) 30⁰
(b) 90⁰
(c) 60⁰
(d) 180⁰

SOLUTIONS
S1. Ans.(d)
Sol. Speed regulation=(Nnl-Nfl)/Nfl ×100 %
Since the speed of the motor is constant hence its speed regulation is zero.

S2. Ans.(d)
Sol. Given P1=P2=100 W
Total reactive power (QT )=VI sin⁡ϕ=√3 (W1-W2 )=√3(100-100)〗=0 Var

S3. Ans.(d)
Sol. The spring gives controlling torque and is connected in series with the coil. If spring is snapped, there will be no deflection. Hence the pointer will come in its initial position i.e., zero.

S4. Ans.(b)
Sol. The operating cost of the hydro plant is low because of prime fuel, pressurized water comes almost free.

S5. Ans.(b)
Sol. Due to smaller air-gap in an Induction motor:
Reluctance is minimum
Inductance is high
Magnetizing current is of smaller value as I_m α 1/L

S6. Ans.(c)
Sol. The coil span of a full pitch coil is always 180° electrical.
Ө_e=P/2 Ө_m
∴180⁰=6/2×Ө_m
⇒Ө_m=60⁰

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