High Voltage Engineering MCQs Multiple Choice Questions Part 6

High Voltage Engineering MCQs

1. Large power transformers are best protected by:
   1. Station type lightning arrestors
   2. Distribution type lightning arrestors
   3. Line type lightning arrestors
   4. None of these

Ans: 1

2. A capacitance-resistance circuit is used to measure the ripple voltages in d.c system. During this process the important condition which should be met is:

1. 1. ω CR >> 1
   2. ω CR << 1
   3. ω CR = 1
   4. ω CR = 0

Ans: 1

3. Circuit breaker dielectric tests include:

1. 1. 1-minute dry withstand test
   2. 1-minute wet withstand test
   3. Impulse voltage dry withstand test
   4. All of these
   5. None of these

Ans: 4

4. The intrinsic breakdown in solids is of the order of __________ sec:

1. 1. 10^-4 s
   2. 10^-8 s
   3. 10^-16 s
   4. 10^-20 s

5. Large size sphere gaps are installed in:

1. 1. Horizontal configuration
   2. Vertical configuration
   3. Any of these
   4. None of these

Ans: 2

6. Recurrent surge generator provides the impulse voltage which has __________ magnitude and to whom the equipment should respond in a ___________ mode:

1. 1. Smaller, Nonlinear
   2. Smaller, Linear
   3. Larger, Nonlinear
   4. Smaller, Nonlinear

Ans: 2

7. The criterion for determining the number of stages for maximum output voltage in Cockroft – Walton is:

1. 1. Frequency of input
   2. Capacitance of each stage
   3.  Required kVA
   4. None of these

Ans: 4

8. ______________ is a type of surge diverter:

1. 1. Rod gap
   2. Valve type of lightning arrester
   3. Protector tube
   4. All above

Ans: 4

9. During their manufacturing process, the High voltage power cables are subject to bending test. The statement which correctly explains this test is:

1. 1. The cable is bent and piston is allowed to fall on it at a comparatively lower power
   2. Firstly voltage test is performed then entire cable is bent in zig-zag position and voltage regulation is checked during process
   3. Cable is bent around cylinder to make one turn is unwound, rewound thrice following a voltage test in start and end
   4. None of these

Ans: 3