 # Quiz: Mechanical Engineering 11 May 2020

Quiz: Mechanical Engineering
Exam: UPSSSC JE
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 10 Minutes

Q1. The frictional resistance of a pipe varies approximately as
(a) Velocity of flow
(b) v^2
(c) √v
(d) v^(3/2)

Q2. Unit of viscosity is
(a) m^2/sec
(b) kg-sec/m^2
(c) N-sec/m^2
(d) N-sec^2/m

Q3. The bending moment on a section is maximum where shear force is
(a) Minimum
(b) Maximum
(c) Zero
(d) Changing sign

Q4. The condenser and evaporator tubes in a Freon refrigeration plant are made of
(a) Steel
(b) Copper
(c) Brass
(d) Aluminium

Q5. The ratio of ultimate stress and working stress is called
(a) Factor of safety
(b) Modulus of elasticity
(c) Poisson’s ratio
(d) None of the above

Q6. The value of frictional force is
(a) More than external force
(b) Equal to the external force
(c) Less than external force
(d) None of these

Q7. Efficiency of gas turbine can be increased by
(a) Reheating
(b) Inter-cooling
(c) Adding a regenerator
(d) All of the above

Q8. The volumetric efficiency of compressor with increase in compressor ratio will
(a) Increase
(b) Decrease
(c) Remain same
(d) None of the above

Q9. The law of parallelogram of forces gives the resultant of
(a) Parallel forces
(b) Two co-planar concurrent forces
(c) Like parallel forces
(d) Non co-planar concurrent forces

Q10. A particle acted upon by two forces in equilibrium, then the angle between the two forces is equal to
(a) 0°
(b) 45°
(c) 90°
(d) 180°

Solutions

S1. Ans.(b)
Sol. The frictional resistance of a pipe varies approximately as the square of the velocity of flow. It can be calculated as ∆P=(fLV^2)/(d.2g)

S2. Ans.(c)
Sol. We know that
Shear stress (τ)=μ(v/L)
Hence, unit of viscosity (μ) = N-sec/m^2

S3. Ans.(c)
Sol. We know that
dM/dX=F
For maximum bending moment (Mmax) at any section, dM/dX=0
So, Shear Force (F) = 0

S4. Ans.(b)
Sol. The condenser and evaporator tubes in a Freon refrigeration plant are made of copper alloy.

S5. Ans.(a)
Sol. Factor of safety is the ratio of ultimate stress to working stress.
Factor of safety=(Ultimate stress)/(Working stress)

S6. Ans.(b)
Sol. The value of frictional force is equal to the external force applied until it starts to move.
Maximum frictional force (F) =μN
Here, μ= static coefficient of friction
N= Normal force

S7. Ans.(c)
Sol. Regenerator is a device that is used to heat up compressed gases by exhaust gases (if the temperature of turbine outlet is higher than that of compressor outlet). By adding a regenerator in a gas turbine cycle, efficiency of gas turbine cycle increases due to increase in mean temperature of heat addition and decrease in mean temperature of heat rejection.

S8. Ans.(b)
Sol. The volumetric efficiency of a compressor is,
η=1+C-C(P2/P1)^(1/n)
By increasing compressor ratio, the volumetric efficiency will decrease.

S9. Ans.(b)
Sol. The law of parallelogram of forces gives the resultant of two co-planar concurrent forces.

S10. Ans.(d)
Sol. When the two forces acted on a particle and the particle is in equilibrium position, then the forces should be equal and opposite and hence, angle between the forces is 180°.

×

## Download success!

Thanks for downloading the guide. For similar guides, free study material, quizzes, videos and job alerts you can download the Adda247 app from play store.

[adda247_lead_form]

## Leave a comment Join India's largest learning destination

What You Will get ?

• Job Alerts
• Daily Quizes
• Subject-Wise Quizes
• Current Affairs
• Previous year question papers
• Doubt Solving session

## Login

OR

Forgot Password? Join India's largest learning destination

What You Will get ?

• Job Alerts
• Daily Quizes
• Subject-Wise Quizes
• Current Affairs
• Previous year question papers
• Doubt Solving session

## Sign Up

OR Join India's largest learning destination

What You Will get ?

• Job Alerts
• Daily Quizes
• Subject-Wise Quizes
• Current Affairs
• Previous year question papers
• Doubt Solving session

## Forgot Password

Enter the email address associated with your account, and we'll email you an OTP to verify it's you. Join India's largest learning destination

What You Will get ?

• Job Alerts
• Daily Quizes
• Subject-Wise Quizes
• Current Affairs
• Previous year question papers
• Doubt Solving session

## Enter OTP

Please enter the OTP sent to
/6

Did not recive OTP?

Resend in 60s Join India's largest learning destination

What You Will get ?

• Job Alerts
• Daily Quizes
• Subject-Wise Quizes
• Current Affairs
• Previous year question papers
• Doubt Solving session

## Change Password Join India's largest learning destination

What You Will get ?

• Job Alerts
• Daily Quizes
• Subject-Wise Quizes
• Current Affairs
• Previous year question papers
• Doubt Solving session

## Almost there

Please enter your phone no. to proceed
+91 Join India's largest learning destination

What You Will get ?

• Job Alerts
• Daily Quizes
• Subject-Wise Quizes
• Current Affairs
• Previous year question papers
• Doubt Solving session

## Enter OTP

Please enter the OTP sent to Edit Number

Did not recive OTP?

Resend 60

## By skipping this step you will not recieve any free content avalaible on adda247, also you will miss onto notification and job alerts

Are you sure you want to skip this step?

## By skipping this step you will not recieve any free content avalaible on adda247, also you will miss onto notification and job alerts

Are you sure you want to skip this step?