Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
84 views
in Physics by (114k points)
closed by
If the COP of a heat pump is 7, then the COP of a refrigerator which is also working between the same high and low temperature is:
1. 8
2. 7
3. 6
4. 5

1 Answer

0 votes
by (115k points)
selected by
 
Best answer
Correct Answer - Option 3 : 6

CONCEPT:

S.No.

Refrigerator

Heat pump
1.

A refrigerator is a device that maintains a system or a body at a temperature lower than the surrounding temperature.

A heat pump is a device that maintains a system or a body at a temperature higher than the surrounding temperature.

2.

In the refrigerator, the heat is removed from the low-temperature body and is rejected to the high-temperature body.

In the heat pump, the heat is removed from the low-temperature body and is added to the high-temperature body.

3.

Generally, the surrounding atmosphere acts as the high-temperature body for a refrigerator.

Generally, the surrounding atmosphere acts as the low-temperature body for a heat pump.

Coefficient of Performance:

  • The coefficient of performance is defined as the ratio of the desired output to the work input.

EXPLANATION:

Given COPHP = 7

  • We know that when a refrigerator and a heat pump are working between the same low and high temperature, the relation between the coefficient of performance of the refrigerator and the heat pump is given as,

⇒ COPHP = COPR + 1

⇒ COPR = COPHP - 1

⇒ COPR = 7 - 1

⇒ COPR = 6

  • Hence, option 3 is correct.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...