MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Heat Pumps

A refrigerato...

Question

A refrigerator absorbs 2000 cals of heat from ice trays. If the coefficient of performance is 4, then work done by the motor is

A

2100 J

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

4200 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

8400 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

500 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A 2100 J
$Q_{2} = 2000 c a l$
COP $= \frac{Q_{2}}{W}$
Therefore $4 = \frac{2000}{W}$
$W = 500 c a l = 500 \times 4.2 = 2100 J$

Suggest Corrections

thumbs-up

0

Similar questions

Q. A refrigerator absorbs

2000 c a l

of heat from ice trays. If the coefficient of performance is

4

, then work done by the motor is:

Q. A refrigerator absorbs

2500

calories of heat from ice trays. If the coefficient of performance is

5

, the work done by motor is:

Q. Let for a refrigerator the heat extracted from the cold reservoir is

Q_{2}

and the work done by the system is

W

, then the coefficient of performance of refrigerator is :

Q. A refrigerator with coefficient of performance

\frac{1}{3}

reales 200 J of heat to a reservoir. Then the work done on the working substance is:

Q. A heat engine having an efficiency of 70% is used to drive a refrigerator having a coefficient of performance of 5. The energy absorbed from low temperature reservoir by the refrigerator for each kJ of energy absorbed from high temperature source by the engine is

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Thermodynamic Devices

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon