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RRB/SSC JE: Applied Thermodynamics Weekly Quiz-3

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Question 1

The thermal efficiency of air standard diesel cycle with increasing cut off ratio keeping other parameters constant

Question 2

For same compression ratio and heat rejection, the efficiency (η)

Question 3

The efficiency of diesel cycle is given by:

Question 4

The Otto cycle thermal efficiency, with usual notation, is given as, where r is compression ratio and γ is the adiabatic index

Question 5

For the same values of peak pressure, peak temperature and heat rejection, the correct order of efficiencies for Otto. Dual and Diesel cycles is

Question 6

Which of the following condition is correct for decreasing the moisture content at the turbine exit.

Question 7

The COP of a cascade refrigeration system is______
where

represents the COP of 1^st refrigeration system and

represents COP of 2^nd refrigeration system.

Question 8

Lowering the evaporator pressure in a vapour compression cycle

Question 9

The coefficient of performance is the ratio of the refrigerant effect to the __________.
A. Heat of compression
B. Work done by compression
C. Enthalpy increase in compressor

Question 10

In an ideal vapour compression refrigeration cycle, the enthalpy of the refrigrator before and after the evaporator are respectively 200 kJ/kg and 300 kJ/kg. The circulation rate of the refrigerant (in kg/min) for each 200 kJ/min of refrigeration is

Question 11

In ammonia-water vapour absorption refrigeration system

Question 12

What is the refrigerant in Lithium Bromide Refrigeration system?

Question 13

VARS (Vapour Absorption Refrigeration System) as shown in figure

Match the following
List 1 List 2
A 1- Condenser
B 2- Expander
C 3- Absorber
D 4- Evaporator
E 5- Vapour generator

Question 14

Maximum possible cop of a solar absorption refrigeration system with generator temperature of 660K, ambient temperature is 275K and evaporator temperature of 200K is ________.

Question 15

A vapour absorption refrigeration system works with generator, ambient and evaporator temperature as 360 k, 310 k and 260 k respectively. If the evaporator temperature falls to 240 k what should be the generator temperature in order to operate the system with same COP in Kelvin?

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ESE & GATE ME Fluid Mechanics & Machinery

Apr 29ESE & GATE ME