NHPC JE'21 ME: Daily Practices Quiz. 09-Nov-2021

Quiz: Mechanical Engineering
Exam: NHPC JE
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes

Q1. A fluid behave as an ideal gas provided it is at :
(a) High Temperature and Pressure
(b) High-Temperature and Moderate Pressure
(c) Low Temperature and Pressure
(d) High Temperature and Low Pressure

Q2. The temperature of an ideal gas always deceases during
(a) Isobaric expansion
(b) Isothermal expansion
(c) Adiabatic expansion
(d) Isentropic expansion

Q3. The throttling operation in a refrigeration cycle is carried out in
(a) Evaporator
(b) Condenser
(c) Discharge valve
(d) Capillary tube

Q4. The maximum value of the bending moment for a cantilever beam with a uniformly distributed load (w) over the entire length (L) is given as ____________.
(a) M_max=(wL^2)/2
(b) M_max=(wL^2)/8
(c) M_max=(wL^2)/4
(d) M_max=(wL^2)/6

Q5. The diameter of the pin in a bushed pin type flexible coupling is to be increased for the purpose of
(a) higher stress due to shear
(b) keeping the magnitude of bending moment small by reducing the unsupported length of the pin
(c) fitting the pin in the bush
(d) reducing the thickness of the flange

Q6. Which cross-section of a cantilever beam which is loaded with UDL can give economical design–
(a) Square
(b) Circular
(c) I-Section
(d) Rectangular

Solutions

S1. Ans. (d)
Sol. A fluid obeys perfect gas or ideal gas at high-temperature and low pressure

S2. Ans. (d)
Sol. The temperature of an ideal gas always decreasing during isentropic expansion.

S3. (d)
Sol. The throttling operation in a refrigeration cycle is carried out in a capillary tube.

S4. Ans. (a)
Sol.
Maximum bending moment
M_max= f.x
M_max=WL×L/2
=(WL^2)/2

S5. Ans. (a)
Sol. The diameter of the pin in a bushed pin type flexible coupling is to be increased for the purpose of higher stress due to shear.

S6. Ans. (c)
Sol. I-section of a cantilever beam which is loaded with UDL will give must economical design as for strongest cross-section, moment of resistance (M_R) should be maximum, which depend upon section modules (2). For same cross-sectional area, section modulus of I-section is maximum, hence it will be the most economical design.