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Applications Questions Set 20:

Quiz Mode

In a Carnot cycle, what is the working fluid?

a natural gas

a real gas

none of the mentioned

an ideal gas

Solution:

The scavenging efficiency of a four-stroke cycle diesel engine is typically:

between 50 and 85%

between 95 and 100%

between 85 and 95%

below 50%

Solution:

What is the ratio of the coefficient of performance (COP) of a vapor compression cycle and the COP of a Carnot cycle?

Performance index

Theoretical COP

Relative COP

Ideal COP

Solution:

What do the inclined straight lines, but non-uniformly spaced, on the psychrometric chart represent?

Specific humidity

Relative humidity

Wet-bulb temperature (WBT)

Dew-point temperature (DPT)

Solution:

If the indicated thermal efficiency of an engine is 25%, the mass flow rate is 25 kg/hr, and the calorific value is 42,000 kJ/kg, find the indicated power.

80.72 kW

72.92 kW

55.26 kW

32.56 kW

Solution:

Between the fluid and machine, the general energy equation for transfer of energy is

E = ṁ (V_w1 × u₁ - V_w2 × u₂)

E = ṁ (V_w1 - V_w2) / (u₁ - u₂)

E = ṁ (V_w1 - V_w2) × (u₁ - u₂)

E = ṁ (V_w1 × u₁ - V_w2 × u₂)²

Solution:

What is the primary function of a refrigerant compressor?

Expand the refrigerant

Raise the temperature and pressure of the refrigerant

Reduce the temperature of the refrigerant

Reduce the pressure of the refrigerant

Solution:

Consider a four-cylinder Two-Stroke SI Engine with bore of 12 cm and stroke of 10 cm. The indicated power is 75 kW. The mechanical efficiency is 0.8, and the brake mean effective pressure is 7.96 bar. Calculate the value of mean piston speed.

11.07 m/s

12.25 m/s

13.34 m/s

15 m/s

Solution:

To calculate the specific speed (N_s) of a turbine rotating at a speed of 'N' RPM that develops the power of 'P' kW at the head of 'H' meters, which of the following formulas is used?

(N_s) = (√N × P) × [(H)^5/4]

(N_s) = (2 √N × P) × [(H)^5/4]

(N_s) = (2N √P) × [(H)^5/4]

(N_s) = (N √P) × [(H)^5/4]

Solution:

For a simple air cooling system, its Coefficient of Performance (C.O.P.) is given by the formula:
(where, T₆ = Inside temperature of cabin,
             T_5' = Exit temperature of cooling turbine,
             T_3' = Temperature at the exit of compressor,
             T_2' = Stagnation temperature)

C.O.P. = (T₆ – T_5') / (T_3' – T_2')

C.O.P. = (T₆ – T_5') / (T_3' + T_2')

C.O.P. = (T₆ + T_5') / (T_3' + T_2')

C.O.P. = (T₆ + T_5') / (T_3' – T_2')

Applications Questions Set 20:

In a Carnot cycle, what is the working fluid?

Solution:

The scavenging efficiency of a four-stroke cycle diesel engine is typically:

Solution:

What is the ratio of the coefficient of performance (COP) of a vapor compression cycle and the COP of a Carnot cycle?

Solution:

What do the inclined straight lines, but non-uniformly spaced, on the psychrometric chart represent?

Solution:

If the indicated thermal efficiency of an engine is 25%, the mass flow rate is 25 kg/hr, and the calorific value is 42,000 kJ/kg, find the indicated power.

Solution:

Between the fluid and machine, the general energy equation for transfer of energy is

Solution:

What is the primary function of a refrigerant compressor?

Solution:

Consider a four-cylinder Two-Stroke SI Engine with bore of 12 cm and stroke of 10 cm. The indicated power is 75 kW. The mechanical efficiency is 0.8, and the brake mean effective pressure is 7.96 bar. Calculate the value of mean piston speed.

Solution:

To calculate the specific speed (N_s) of a turbine rotating at a speed of 'N' RPM that develops the power of 'P' kW at the head of 'H' meters, which of the following formulas is used?

Solution:

Solution:

Related Question Sets:

Related Topics:

Applications Questions Set 20:

In a Carnot cycle, what is the working fluid?

Solution:

The scavenging efficiency of a four-stroke cycle diesel engine is typically:

Solution:

What is the ratio of the coefficient of performance (COP) of a vapor compression cycle and the COP of a Carnot cycle?

Solution:

What do the inclined straight lines, but non-uniformly spaced, on the psychrometric chart represent?

Solution:

If the indicated thermal efficiency of an engine is 25%, the mass flow rate is 25 kg/hr, and the calorific value is 42,000 kJ/kg, find the indicated power.

Solution:

Between the fluid and machine, the general energy equation for transfer of energy is

Solution:

What is the primary function of a refrigerant compressor?

Solution:

Consider a four-cylinder Two-Stroke SI Engine with bore of 12 cm and stroke of 10 cm. The indicated power is 75 kW. The mechanical efficiency is 0.8, and the brake mean effective pressure is 7.96 bar. Calculate the value of mean piston speed.

Solution:

To calculate the specific speed (Ns) of a turbine rotating at a speed of 'N' RPM that develops the power of 'P' kW at the head of 'H' meters, which of the following formulas is used?

Solution:

For a simple air cooling system, its Coefficient of Performance (C.O.P.) is given by the formula: (where, T6 = Inside temperature of cabin, T5' = Exit temperature of cooling turbine, T3' = Temperature at the exit of compressor, T2' = Stagnation temperature)

Solution:

Related Question Sets:

Related Topics:

To calculate the specific speed (N_s) of a turbine rotating at a speed of 'N' RPM that develops the power of 'P' kW at the head of 'H' meters, which of the following formulas is used?

For a simple air cooling system, its Coefficient of Performance (C.O.P.) is given by the formula:
(where, T₆ = Inside temperature of cabin,
T_5' = Exit temperature of cooling turbine,
T_3' = Temperature at the exit of compressor,
T_2' = Stagnation temperature)