UPPCL-JE’21 EE: Daily Practices Quiz 28-Dec-2021

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UPPCL-JE’21 EE: Daily Practices Quiz

UPPCL-JE’21 EE: Daily Practices Quiz 28-Dec-2021

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

Q1. Which of the following motor is best suitable for the hoist?
(a) 3-Phase Induction motor
(b) 1-Phase Induction motor
(c) 3-Phase synchronous motor
(d) Repulsion Motor

Q2. The surge impedance of a 400 KV, 3-phase transmission line is 200 Ω, the surge impedance loading is:
(a) 400 MW
(b) 800 MW
(c) 1600 MW
(d) 200 MW

Q3. In a series resonant circuit, the voltage across the circuit is the same as the voltage across
(a) Inductance
(b) Capacitance
(c) Resistance
(d) None of the above

Q4. Which one of the following methods gives voltage regulation higher than the actual value in an alternator?
(a) ZPF method
(b) MMF method
(c) emf method
(d) ASA method

Q5. Three inductors each of 30 mH are connected in delta. The value of inductance of each arm of the equivalent star connection is
(a) 30 mH
(b) 90 mH
(c) 10 mH
(d) 60 mH

Q6. The purpose of coating on arc welding electrodes is to
(a) stabilize the arc
(b) provide a protecting atmosphere
(c) provide slag to protect the molten metal
(d) all of the above

SOLUTIONS

S1. Ans.(a)
Sol. Crane and hoist require high starting torque during starting because they carry the heavy load. The induction motor has the starting torque of about 1.2 to 1.5 times of full load torque hence they are preferred for crane and hoist.

S2. Ans.(b)
Sol. SIL=V^2/Z_s =(400×10^3 )^2/200=800 MW.

S3. Ans.(c)
Sol. In the RLC series circuit, when the circuit current is in phase with the applied voltage, the circuit is said to be in Series Resonance. The resonance condition arises in the series RLC circuit when the inductive reactance is equal to the capacitive reactance.
i.e., X_L=X_C and Z=R

S4. Ans.(c)
Sol. EMF method of voltage Regulation is known as “Pessimistic Method” because gives VR higher than actual.

S5. Ans.(c)
Sol. For equivalent star connection
ZY = (1/3) ZΔ
= 30/3
= 10 mH

S6. Ans.(d)
Sol. The primary purpose of a light coating is to increase arc stability, provide a protective
gaseous atmosphere to prevent oxygen, hydrogen, and nitrogen picks up by the molten
metal and Protective slag over hot metal etc.

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