MCQ
6401. Time constant of a capacitive circuit-
Increases with the decrease of capacitance and decrease of resistance
Increases with the decrease of capacitance and increase of resistance
Increases with the increase of capacitance and 2 decrease of resistance
Increases with the increase of capacitance and the increase of resistance
6402. In a loss-free R-L-C circuit, the transient current is-
Oscillating
Square wave
Sinusoidal
Non-oscillating
6403. Capacitors for power factor correction are rated in-
kW
kV
KVA
KVAR
6404. The double energy transient occur in the-
R-L circuit
R-C circuit
R-L-C circuit
Purely inductive circuit
6405. Skin effect occurs when a conductor carries current at frequencies,
low
High
Very low
Medium
6406. পাহাড়ি এলাকায় সাধারণত কোন আর্থিং করা হয়?
পাইপ আর্থিং
প্লেট আর্থিং
রড আর্থিং
শিট আর্থিং
6407. The frequency of domestic power supply in Bangladesh is --
200Hz
60Hz
100Hz
50Hz
6408. The purpose of a parallel circuit resonance is to magnify-
Current
Voltage
Power
Frequency
6409. The apparent power drawn by an A.C. circuit is 10kVA and active power is 8kW. The reactive power in the circuit is---
4 KVAR
6KVAR
8 KVAR
16 KVAR
6410. Magnitude of current at resonance in R-L-C circuit-
Depends upon the magnitude of R
Depends upon the magnitude of L
Depends upon the magnitude of C
Depends upon the magnitude of R, L and C
6411. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will-
Be reduced by half
Be doubled
Be four times as high
Be reduced to one fourth
6412. In a circuit containing R, L. and C, power loss can take place in-
C only
L only
R only
All above
6413. The time constant of a series R-C circuit is given by-
R/C
RC
RC2
R2C
6414. --- Power factor of the following circuit will be zeгo.
Resistance
Inductance
Capacitance
Both (b) and (c)
6415. আবাসিক লোডের লোড ফ্যাক্টর-
১০%-১১%
১১%-১২%
৬০%-৭০%
৩০%-৪০%
6416. In any A.C. circuit always-
Apparent power is more than actual power
Reactive power is more than apparent power
Actual power is more than reactive power
Reactive power is more than actual power
6417. The safest value of current the human body can carry for more than 3 second is-
4mA
9mA
15mA
25mA
6418. একটি 56 ইঞ্চি Ceiling fan আনুমানিক যে পরিমাণ বিদ্যুৎ ব্যয় করে-
130W
65W
25W
75W
6419. The frequency of an alternating current is-
The speed with which the alternator runs
The number of cycles generated in one minute
The number of waves passing through a point in one second
The number of electrons passing through a point in one second
6420. একটি শিল্পপ্রতিষ্ঠানের ভোল্টেজ খুব উঠানামা করে। এটা নিরসনের জন্য কোন ব্যবস্থাটি গ্রহণ করা উচিত?
ট্রান্সফরমার টেপিং বদলানো
সুইচ-ক্যাপাসিটর ব্যবহার করা
সিস্টেমের ইম্পিডেন্স বৃদ্ধি করা
লো-ভোল্টেজ অ্যাপ্লায়েন্স ব্যবহার করা