The bypass factor of a cooling coil decreases with

A Decrease in fin spacing and increase in number of rows
B Increase in fin spacing and increase in number of rows
C Increase in fin spacing and decrease in number of rows
D Decrease in fin spacing and decrease in number of rows

Correct Answer: Decrease in fin spacing and increase in number of rows

The bypass factor is a function of the airflow, number of rows, surface temperature, number of fins per inch, height of fins and many other construction attributes of coils.
The bypass factor of a cooling coil decreases with decrease in fin spacing and increase in number of rows.
Bissoy MCQ
#Mechanical Engineering #Refrigeration and Air Conditioning

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একটি স্টেপ আপ ট্রান্সফরমারে, গৌণ কুণ্ডলীর পাকসংখ্যা মুখ্য কুন্ডলীর পাকসংখ্যার দ্বিগুণ। যদি মূখ্য কুন্ডলীকে কোন পরিবর্তী বিদ্যুৎ লাইনের সাথে সংযুক্ত করা হয়, তাহলে মুখ্য কুণ্ডলীর তুলনায় গৌণ কুণ্ডলীতে- (In a step up transformer, the number of turns in the secondary coil is twice to that of primary coil. If you apply an alternating current in the primary coil, then in the secondary coil compared to the primary coil-)
A তড়িৎ প্রবাহের মান দ্বিগুণ হবে (current will be doubled)
B তড়িৎ প্রবাহের মান অর্ধেক হবে (current will be halved)
C তড়িৎ বিভবের মান অর্ধেক হবে (voltage will be halved)
D তড়িৎ প্রবাহের মান সমান থাকবে (Current will remain the same)
The bypass factor for a cooling coil
A Increases with increase in velocity of air passing through it
B Decreases with increase in velocity of air passing through it
C Remains unchanged with increase in velocity of air passing through it
D May increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will
A Increase
B Decrease
C Remain the same
D Initially increase and then decrease
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?
A Decreases
B Increases
C Remains same
D First increases and then decreases depending on the depth of iron in¬sertion
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)
A B.P.F. - 1
B 1 - B.P.F.
C $$\frac{1}{{{\text{B}}{\text{.P}}{\text{.F}}{\text{.}}}}$$
D 1 + B.P.F.
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
A Increase
B Decrease
C Remain constant
D Be excessive
The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as
A Self-inductance
B Mutual inductance
C Series aiding inductance
D Capacitance
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
A Active power in R phase
B Active power of Y phase
C Reactive power of R phase
D Power proportional to 3 phase power if the load is balanced
The pressure coil of a wattmeter should be connected on the supply side of the current coil when
A Load impedance is high
B Load impedance is low
C Supply voltage is low
D None of the above
A coil is cut into two halves, the stiffness of cut coil will be
A Double
B Half
C Same
D None of these

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