NHPC JE Recruitment 2021
National Hydroelectric Power Corporation (NHPC) has released the recruitment notification for engagement of the following posts as Senior Medical Officer, Assistant Rajbhasha Officer, Junior Engineer & Sr. Accountant posts. NHPC expects applications from High Performing, Dynamic & Achievement-Oriented Professionals candidates to fill up these 173 vacancies.
NHPC-JE’21 EE: Daily Practices Quiz
NHPC-JE’21 EE: Daily Practices Quiz 26-Oct-2021
Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 06 min.
Q1. As compared to a split phase motor, a capacitor start motor has………
(a) Higher running torque
(b) Lower starting torque
(c) Higher starting torque
(d) None of the above
Q2. Which of the following voltmeter has least power consumption?
(b) Moving iron
(c) Induction type
(d) Hot wire
Q3. What will be the transformation ratio of a 550/110 V, 50 Hz single-phase step-down transformer?
Q4. Diffusion capacitance of a PN junction diode………. with forward bias.
(c) Remains the same
(d) May increase or decrease
Q5. The purpose of guard ring in transmission lines is to…………
(a) Reduce the reactance of the line
(b) Increase the earth capacitance of the lowest unit
(c) Reduce the transmission line losses
(d) Reduce the earth capacitance of the lowest unit
Q6. An RLC series resonance circuit boosts:
Sol. Decreasing order of starting torque:
Capacitor start capacitor run > capacitor start > split phase
Sol. Electrostatic type has very low power consumption while induction type has very high-power consumption.
Sol. Turn ratio=N1/N2 =V1/V2
Transformation ratio=N2/N1 =V2/V1 =110/550=0.2
Sol. Diffusion capacitance is directly function of applied voltage or current. when forward bias voltage is applied across PN diode, a large number of charges is accumulated near the depletion layer, as a result, large diffusion capacitance occurs,
Sol. The purpose of guard ring in transmission lines is to:
Reduce the earth capacitance of the lowest unit
Equal voltage distribution across each disc
Sol. RLC series resonance circuit:
XL=XC and Z=R
As impedance is lower, the current will be maximum.