UPRVUNL’21 EE: Daily Practices Quiz 14-July-2021

Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 08 min.

Q1. A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is
(a) 0 V
(b) 20 V
(c) 40 V
(d) 60 V

Q2. Which of the following represents the operating region slips of a 1-phase induction motor?
(a) 0<s<2
(b) -2<s<2
(c) 0<s<1
(d) -1<s<1

Q3. For the protection of transformer against all kinds of incipient faults, which relay is used:
(a) Buchholz relay
(b) Earth-fault relay
(c) Overcurrent relay
(d) All of the above

Q4. What type of earthing is used by transmission lines?
(a) Plate earthing
(b) Rod earthing
(c) Strip earthing
(d) Both (a) & (c)

Q5. What is the dimension of the copper strips used for the strip earthing?
(a) 25 mm * 4 mm
(b) 25 mm * 3 mm
(c) 30 mm * 4 mm
(d) 30 mm * 3 mm

Q6. The illumination at a point 5 metres below a lamp is 6 LUX. The candela power of the lamp is:
(a) 30
(b) 150
(c) 180
(d) 200

SOLUTIONS
S1. Ans.(c)
Sol. in case of generator: E_g=V_t+I_a R_a
In case of motor: E_b=V_t-I_a R_a
∴E_g-E_b=2I_a R_a=2×20×1=40 V

S2. Ans.(a)
Sol. In a 1-phase induction motor, due to both forward and backward torque slips, the operating region lies between 0 and 2. In motoring mode slip is 0 to 1 and breaking mode 1 to 2.

S3. Ans.(a)
Sol. Buchholz relay is used for protection against insulation failure of windings, core heating, fall of oil level, etc.

S4. Ans.(c)
Sol. Strip earthing is used by transmission lines.

S5. Ans.(a)
Sol. Dimension of strip earthing: 25 mm * 4 mm.

S6. Ans.(b)
Sol. Illumination=CP/(distance)^2
∴CP=6×(5)^2=150.

×

Join India's largest learning destination

What You Will get ?

• Daily Quizzes
• Subject-Wise Quizzes
• Current Affairs
• Previous year question papers
• Doubt Solving session

OR

Join India's largest learning destination

What You Will get ?

• Daily Quizzes
• Subject-Wise Quizzes
• Current Affairs
• Previous year question papers
• Doubt Solving session

OR
Join India's largest learning destination

What You Will get ?

• Daily Quizzes
• Subject-Wise Quizzes
• Current Affairs
• Previous year question papers
• Doubt Solving session

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 ?

• Daily Quizzes
• Subject-Wise Quizzes
• 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 ?

• Daily Quizzes
• Subject-Wise Quizzes
• Current Affairs
• Previous year question papers
• Doubt Solving session

Join India's largest learning destination

What You Will get ?

• Daily Quizzes
• Subject-Wise Quizzes
• Current Affairs
• Previous year question papers
• Doubt Solving session

Almost there

+91

Join India's largest learning destination

What You Will get ?

• Daily Quizzes
• Subject-Wise Quizzes
• 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?