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Engineering :: Energy Conversion

121.  In any transmission line, which two generalised constants are equal?
A. A and B B. A and C
C. B and C D. C and D
E. A and D    
122.  In any transmission line, the dimensions of constants B and C are
A. ohm and ohm B. ohm and mho
C. mho and ohm D. mho and mho
E. None of the above    
123.  The dimensions of generalised constants A and D are
A. ohms and mhos B. ohms and ohms
C. mhos and mhos D. mhos and ohms
E. Both are dimensionless    
124.  The thickness of the layer of insulation on a cable depends on
A. Current carrying capacity of conductor B. Voltage
C. KVA D. kW
E. Power factor    
125.  The material used for insulation on the cable is
A. Impregnated paper B. Varnished cambric
C. Rubber mineral compound D. Any of the above
E. None of the above    
126.  A metallic sheath is provided on cable
A. to protect against moisture, gases and other damaging liquids B. to protect from mechanical damage due to rubbing
C. to protect against sparking D. to avoid damage to the cable during laying
E. All of the above    
127.  A layer of fibrous material like jute or hessian type provided over metallic sheath on a cable is known as
A. Armouring B. Bedding
C. Laying D. Cover
E. None of the above    
128.  The insulation material for a cable should have
A. High dielectric strength B. High inechanical strength
C. Non-inflammability D. Low cost
E. All of the above    
129.  The dielectric strength of rubber is about
A. 3 kV/mm B. 30 kV/m
C. 30 kV/cm D. None of the above
130.  A 660 V cable is known as
A. Low tension cable B. High tension cable
C. Super tension cable D. Extra high tension cable
E. Extra super voltage cable    

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