4541. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is
A. Positive
B. Negative
C. Zero
D. Infinity
✅ The correct answer is option C.
Chemical Engineering
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4542. The value of gas constant ‘R’ is
A. 1.987 cal/gm mole °K
B. 1.987 BTU/lb. mole °R
C. Both A and B
D. Neither A nor B
✅ The correct answer is option C.
4543. Clausius – Clayperon equation is applicable to __________ equilibrium processes.
A. Solid-vapor
B. Solid-liquid
C. Liquid-vapor
D. All of the above
✅ The correct answer is option D.
4544. Boyle’s law for gases states that
A. P ∝ 1/V, when temperature is constant
B. P ∝ 1/V, when temperature & mass of the gas remain constant
C. P ∝ V, at constant temperature & mass of the gas
D. P/V = constant, for any gas
✅ The correct answer is option B.
4545. Which one is true for a throttling process?
A. A gas may have more than one inversion temperatures
B. The inversion temperature is different for different gases
C. The inversion temperature is same for all gases
D. The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
✅ The correct answer is option B.
4546. Identify the group in which all the polymers mentioned can be used to make fibres.
Butadiene copolymers, Polyamides, Urea aldehyde
Cellulose derivatives, Polyisoprene, Polyethylene
Cellulose derivatives, Polyamides, Polyurathane
Polypropylene, Poly vinyl chloride, Silicon
✅ The correct answer is option B.
4547. For any system, what is the minimum number of degrees of freedom?
A. 1
B. 0
C. 2
D. 3
✅ The correct answer is option B.
4548. Thiokol is nothing but
polysulphide rubber
polyamide fibre
engineering plastic
exponded polystyrene
✅ The correct answer is option A.
4549. Silicone resins, which are highly water repellant and has good heat resistance can not be used
as room temperature adhesive.
as grease & lubricant.
hydraulic fluid for heat transfer.
resin for lamination.
✅ The correct answer is option A.
4550. __________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.
Fibrous
Leathery
Rubbery
Hard
✅ The correct answer is option B.