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DFCCIL’21 EE: Daily Practices Quiz 06-Sep-2021
Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 08 min.
Q1. In a parallel RLC circuit if the lower cut off frequency is 2400 Hz and the upper cut off frequency is 2800 Hz what is the band width?
(a) 400 Hz
(b) 5200 Hz
(c) 2400 Hz
(d) 2800 Hz
Q2. If a dynamometer type wattmeter is connected in an ac circuit the power indicated by the wattmeter will be
(a) peak power
(b) average power
(c) instantaneous power
(d) volt ampere product
Q3. If the number of turns of a coil is increased, its inductance
(a) remains the same
(b) is decreased
(c) none of these
(d) is increased
Q4. Base load of a power station stands for?
(a) 2-4 hours/day
(b) 4-8 hours/day
(c) 12-24 hours/day
(d) 8-12 hours/day
Q5. Which of the following logical expression is incorrect?
Q6. Which of the following is basically a voltage-controlled capacitance?
(a) Zener diode
(c) Varactor diode
Sol. Bandwidth=f_H-f_L=2800-2400=400 Hz.
Sol. If a dynamometer type wattmeter is connected in an ac circuit the power indicated by the wattmeter will be average power.
Sol. L α N^2
So, if the number of turns of a coil is increased, its inductance is increased.
Sol. Base load is the minimum level of demand on an electrical supply system over 24 h. Base load power sources are those plants that can generate dependable power to consistently meet demand.
Sol. A Varactor Diode (also known with the names Varicap Diode, Varactor Diode, Tuning Diode) is a p-n junction diode which acts as a variable capacitor under varying reverse bias voltage across its terminals.