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The volumetric efficiency of a well-designed SI engine lies in the range
4൧) 40 - 50% B) 51-60% C) 61-70% D) 71-90%

In two-stage reciprocating air compressor, the suction and delivery pressures are
1 and 4 bar respectively. For maximum efficiency, the intercooler pressure is

A) 3 bar B) 2.5 bar C) 2bar D) 1.5 bar

If an axial flow compressor is designed for a constant velocity through all stages,
then the area of annulus of the succeeding stage will

A) remain the same B) progressively decrease
C) progressively increase D) depend upon number of stage

Increasing the number of reheating stages in a gas turbine to infinity makes the
expansion tending

A) isothermal B) isobaric
C) adiabatic D) reversible adiabatic

A refrigerator working on a reversed Carnot cycle has a COP of 4.5. If it works as a
heat pump and consumes 1 kW, the heating effect will be

A) 1 kw B) 4.5 kw 00 ۷ 7) 5.5 01

In aqua ammonia and Li-Br water absorption refrigeration systems, the refrigerants are
A) water and water B) water and Li-Br

C) ammonia and Li-Br D) ammonia and water

During chemical dehumidification process of air

A) dry bulb temperature and specific humidity decrease

B) dry bulb temperature decreases and specific humidity increases
C) dry bulb temperature increases and specific humidity decreases
D) dry bulb temperature and specific humidity increase

An increase in fin effectiveness is caused by high values of
1. convective coefficient

2. thermal conductivity

3. cross sectional area

4. circumference

Identify the correct statement.

A) 1 and3 B) 2and3

C) 3and4 D) 2and4