# In RE cable the insulation resistance will be

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In RE cable the insulation resistance will be above 20 mega ohms.

## Related questions

A megger is to measure insulation resistance of a cable. The cable should be connected to   (a) Battery (b) DC supply (c) AC supply (d) No supply

If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be

What is the lowest acceptable insulation resistance for a cable?

In a 3-phase extra-high voltage cable, a metallic screen around each core insulation is provided to  (a) Facilitate heat dissipation (b) Give mechanical strength (c) Obtain longitudinal electric stress (d) Obtain radial electric stress

The insulation resistance of earth of an installation should be nearly: -  a) 0.1 M ohm b) 0.2 M ohm c) 0.5 M ohm d) 1 M ohm.

If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be?

Explain vacuum impregnation method used for Re-varnishing of insulation with neat diagram.

When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because  (A) Cables have a low value of capacitance which draws a high value of charging current (B) Cables have a low value of initial resistance (C) Cables have a high value of capacitance which draws a high value of charging current (D) Cables have a low value of capacitance and initial resistance

If the emitter resistance ‘Re ’ in a transistor amplifier is removed, then (a) base to emitter junction will be less forward biased. (b) gain of amplifier decreases. (c) Q-point becomes unstable. (d) All of these

A cable has an insulation of relative permittivity 2. If the insulation is replaced by one of relative permittivity 4, then capacitance of the cable (a) is doubled (b) is halved (c) remains unchanged (d) is reduced

The effective resistance of a conductor will be the same as ohmic resistance when : -  a) current is in true sine wave form b) voltage is low c) power factor is unity d) current is uniformly distributed in the conductor cross-section

if voltage is 230 Volts , frequency is 50 Hz and current is 1 ampere then what will be the resistance?

If resistance is 8 Ohm and current is 16 ampere then what will be the voltage and power?

The insulation resistance test is performed on power lines with   (a) ohm meter (b) earth tester (c) megger (d) Any of these

To measure insulation resistance of equipments of voltage rating upto 440 V the megger generator must generate   (a) 220 V (b) 440 V (c) 500 V (d) None of these

The torque produced in a 4-pole machine is 100 Nm. If machine is re-wound with 6 ploes, other things remaining the unchanged, then the torque produced would be (1) 66.67 Nm (2) 100 Nm (3) 150 Nm (4) 133.33 Nm

Minimum distance of underground cable from the foundation of building should be   (a) 100 cm (b) 50 cm (c) 10 cm (d) 5 cm

A star circuit has element of resistance R/2. The equivalent delta elements will be?

If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be?

A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9

The power factor will be maximum in case of  (a) Electric are heating (b) Resistance heating (c) Induction heating (d) Dielectric heating

In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be -

In a system, the damping coefficient is - 2. The system response will be (a) Undamped (b) Oscillations with decreasing magnitude (c) Oscillations with increasing magnitude (d) Critically damped

In any network the current will be seen to be consisting of a forced current and a natural current. A forced current is  (a) A steady-state current with external source but a natural current is a transient current in a closed circuit with no external source. (b) A transient current with external source but a ... an external source. (d) A transient current in a closed circuit without external source, while a natural current is a steady-state current with an external source.

. If the peak transmitted power in a radar system is increased by a factor of 16, the maximum range will be increased by a factor of : (A) 2 (B) 4 (C) 8 (D) 16

In a d.c. series motor, the torque developed is 20 Nm at 10A. If the load current is doubled, the new torque will be : -  a) 60 Nm b) 45 Nm c) 80 Nm d) 100 Nm

A series RLC circuit resonate at 200 Hz. If the capacitance is increased to four times, the circuit will be in resonance at   (a) 100 Hz (b) 200 Hz (c) 400 Hz (d) 800 Hz

In case of four pole, lap wound machine if the air gap under each pole is the same, then what will be the result?  (A) There will be reduced eddy currents (B) There will be reduced hysteresis loss (C) Current in each path will not be the same (D) It will result in higher terminal voltage

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?

The power consumed in a circuit element will be least when the phase difference between the current and voltage is?

what will be the capacitance if three capacitors connected in parallel each having value of 0.5 micro Farad ?

all resistance in parallel will have same?

all resistance in series will have same?

State the methods used to measure insulation resistance and explain Dielectric Absorption method.

Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

In large capacity transformers, 5% of the turns at the end of hv winding are provided with extra insulation so as to provide protection  (1) against corona (2) against lightning (3) due to surges occurring during switching operation (4) All of these

When 7/0.029 V.I.R cable is carrying 20 A, a drop of 1 V occurs every 12 m. The voltage drop in a 100 m run of this cable when it is carrying 10 A is nearly  (a) 4.2 V (b) 3.2 V (c) 1.2 V (d) 0.42 V