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NHPC-JE’21 EE: Daily Practices Quiz 21-Oct-2021

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NHPC-JE’21 EE: Daily Practices Quiz

NHPC-JE’21 EE: Daily Practices Quiz 21-Oct-2021

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

Q1. The penalty for low power factor is imposed on
(a) Industrial consumers
(b) Residential and commercial consumers
(c) Agricultural consumers
(d) All of the above

Q2. Doherty rate tariff is applied to…
(a) Municipal loads
(b) Bulk supplies
(c) Domestic consumers
(d) Medium industrial consumers

Q3. Tower footing resistance of a transmission tower should be
(a) Moderately low
(b) Moderately high
(c) As low as possible
(d) As high as possible

Q4. Which of the following type of instrument is used only for D.C?
(a) Moving iron-attraction type
(b) Moving iron-repulsion type
(c) Permanent magnet type
(d) Hot wire type

Q5. In a three-phase induction motor, the ratio of starting current to full load current is 12.56 and the ratio of starting torque to full load torque is 1.6. percentage slip at full load is………
(a) 0.1 %
(b) 1%
(c) 12.56 %
(d) None of the above

Q6. The output signal of a common-collector amplifier always:
(a) Larger than the input signal
(b) In phase with the input signal
(c) Out of phase with the input signal
(d) Exactly equal to the input signal

SOLUTIONS

S1. Ans.(a)
Sol. Power factor tariffs are usually applicable to industrial consumers.

S2. Ans.(b)
Sol. Doherty tariff is also known as three-part tariff is applicable to bulk supplies and in this tariff, charges are split into three elements namely fixed charge, semi-fixed charge and a variable charge.

S3. Ans.(c)
Sol. Tower footing resistance of a transmission tower should be as low as possible. The low value of tower footing resistance results in less voltage stresses across line insulation.
NOTE: Tower footing resistance can be reduced by using a single driven rod.

S4. Ans.(c)
Sol. PMMC
→ only for DC
→ Scale is uniform
→ Eddy current damping is used
→ F = BIL
→ The torque/Weight ratio is high to reduce frictional errors.

S5. Ans.(b)
Sol. In a three-phase induction motor, T_st/T_fl =(I_st/I_fl )^2 s_fl
∴1.6=(12.56)^2 s_fl
∴s_fl=0.01 or 1%

S6. Ans.(b)
Sol. The output signal of a common-collector amplifier is always in phase with the input signal.

Parameter Common Base Common Emitter Common Collector
Voltage Gain High, Same as CE High Less than Unity
Current Gain Less than Unity High High
Power Gain Moderate High Moderate
Phase inversion No Yes No

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